Great videos. Thanks for taking your time to do this. 90% of mechanic's are parts changers. Finding the real problem is key to being a truly great mechanic.
I could have figured that one out without a computer. You heard the misfire. Unplug the #1 coil and the engine would have ran worse. Unplug the #2 coil and the engine wouldn’t have changed. Swap #1 coil with #2 and the misfire would have moved to #1 cylinder. Change the #1 coil. Yes I have done this before.
Love your channel, Dan. It's like the olden days of Wheeler Dealers with Edd China doing all the fault finding, fixing and explaining. We're all better car owners thanks to you. One suggestion: buy a lavalier / lapel / clip on mic (whatever you want to call it) with a wireless receiver plugged in into your camera. If you need to put up a crowdfunder for that, I'd be happy to pop in some money.
You are an incredible mechanic/diagnostician. Legend. I would love to learn from working along with you. I would learn more in a day than a year with most mechanics
HI DAN, IMMEDIATELY VERIFIED MISFIRE BY HC NUMBERS. IT IS A VERY HANY TOOL. NEVER FAILS. NEXT STEP OSCILLOSCOPE CONFIRM DEFECTIVE COIL. VERY PROFESSIONAL APPROACH; DIRECT TO THE ISSUE. YOU MADE IT SO EASY; THANK YOU. ALL OF IT LOGIC EACH STEP OF THE WAY. YOU ARE A BIG ASSET TO THE AUTOMOTIVE INDUSTRY. KEEP UP THE GOOD WORK.
This is the best car diagnostics channel I've seen on youtube, by far. I love the kit you've got! Can you talk about the prices and whether and how good are cheap home units and about typical rental options for expensive equipment?
Wonder if current and duty cycle reading from an amp clamp tried on each coil would have isolated the anomalous (misfiring) coil. DC amp clamps with Hz and % are cheap as chips nowadays.
I watched another channel from a guy in England (I think) who used a coin on top of the coil and a standard probe to pickup the signal from the coil. He showed that by not using the coin he got no signal but by replacing the coin on top of the coil, received the signal again. He said it was a tip he got from an older mechanic he was working with. Pretty neat!
I think your description of a transistor being a relay is correct. When it's used to switch current on and off, it is working as a relay. When it's used to modulate a high voltage or current then it is working as an amplifier. The relay analogy is a good one. Great videos.
It’s a real joy to see your videos, I am learning alot and love your detectives work. Nice to see that your children is involved also! Thanks from Sweden
Dan, your the man! You actually explain this stuff in very easy terms. You make it look so easy. Keep up the great informative videos please I’m sure we all learn a lot from you.
Awesome video! I’ve been having a similar problem on my Nissan Xterra! Had a intermittent misfire under load (2k rpm) and then sometimes at idle, no codes. The other day the cylinder was dead enough to finaly throw a check engine light! I’ve never been more happy to see a flashing check engine light! Swapped the coil from cylinder 3 (the cylinder at fault) to cylinder 4 and now it’s a waiting game 🫣
Great video. Awesome current waveform diagnosis! My amp clam is one of my favorite tools to use for coil diag. Unfortunately I don't own a cop tester or paddle probe yet. Maybe a Xmas present lol! Scannerdanner used to say coil amp wave forms should have a slope as the current fights resistance as it builds a feild, shorted windings equall the straight up line you showed, if it was zoomed more you would see a very clear straight up line. Great video, you have a lifetime subscriber!
nice to see both of your youngsters taking an interest keep it up kids your at a better age to lean this than I am but bcause of yourdad I have learnt more than I all ready knew so it goes with the never too old to learn
Dan, i would like to thank you! I watched your videos and i got so intrested in car diagnostic that i immitiately went to mechnic shool and gave papers in and car diagnostic one year trade schooling starts from next week already! All thanks to you, always have found it intresting but way you teach got me really thinking that this is the way i want to envolve in future in my garage workshop.
Wish I could have a mechanic like you take a look at my car, I've been having a fault exactly the same as this. I've had all sorts of work done on the car (part changing by guessing mechanics) and it's cost me a fortune and my car is still faulty.
Great video Dan, I love that you had your children on camera. Beautiful family. God Bless. I have a 2008 Honda Civic with the same noise at the exhaust but no codes, looks like I have a bad coil also, maybe. Thanks for the video, you gave me a place to start looking. God Bless.
Inspiring! My forester performed strange: daily short drive is fine, but got misfire at cilender 3 n 4, after 1 hour on highway. Can start again a few minutes later. Machanic suspect aged coil inside, but not sure
I LOVE seeing the kids getting involved, especially his darling daughter! I loved helping my dad work on cars, and learned a lot of useful info. I helped him bleed the brakes as soon as my legs were long enough to reach the pedal! He made sure I could change a tire by myself and check all the fluids and other important things. Always keep extra fuses in the glovebox, and a roll of duct tape can't hurt! Nowadays, I also keep an OBD II in the glovebox too. Daddy's been gone 25 years, but a day doesn't go by that I don't think about him, and his lessons for life.
Good video and explanation. What would a wave pattern look like where coil is connected by a plug wire and a short is between the plug and engine? In other words not all of the spark is getting to the plug gap. Thanks.
I've seen cars flash the check engine light and sometimes throw intermittent misfire codes but there were no real misfires. A bad drive belt can cause these symptoms when the belt starts slipping. When the belt slips it will jerk the crankshaft, which upsets the rotational timing between cylinders. Monitoring the timing of the crankshaft rotation between cylinders is how the computer detects misfires so the slipping belt can fool the computer into thinking that you have a misfire when you really don't. If you have a problem like this and the car has high mileage and it still has the original belt try changing the belt, which probably needs to be done anyway.
@kapil pawar Sorry, there is some confusion here. The type of misfire codes I'm talking about are NOT associated with the internal timing belt that drives the camshaft off of the crankshaft. Instead they are false misfire codes that are being generated when an external accessory drive belt or the serpentine belt is slipping intermittently. As I stated in my post as the coupling between any of the driven accessories (alternator, water pump, PS pump, A/C compressor, etc.) and the crankshaft suddenly changes the crankshaft gets jerked, which upsets the timing interval between cylinders. This in turn fools the computer causing it to throw the misfire codes even though there are no real misfires. One obvious hint is if the engine always runs perfectly with no misfires being felt, especially during acceleration, but then you are getting intermittent misfire codes anyway. To make things really confusing rain can sometimes make a worn or stretched accessory drive belt slip when its wet, but it doesn't slip when its dry. This in turn will cause the false misfire codes but only when it rains. This type of misfire problem can sometimes be associated with bad spark plug wires or a bad coil causing a technician to be seriously misled about what's actually causing the intermittent misfire codes when it's raining. Sorry for the confusion.
@kapil pawar he is not talking about the timing belt but the drive belt. Slipping could cause the crankshaft to speed up and slow down. The ecu might think this is caused by a misfire😉
@kapil pawar Good question. Let's start with a little review of basic engine theory. On a four cylinder engine you will be getting four pulses off the crankshaft sensor per each crankshaft rotation. Now remember that on a 4 cycle engine the crankshaft goes around twice for every time the camshaft goes around once. Further, remember that each cylinder only fires once for every two times its piston comes up to top dead center (TDC). This is why the computer also needs an additional signal coming off the camshaft position sensor. This camshaft signal lets the computer know what the valve train is doing so the computer knows which two cylinders are firing on this crankshaft rotation and then which two cylinders are firing on the next crankshaft rotation. By knowing all this the computer knows which piston is currently on its compression stroke so it can open the correct fuel injector and fire the correct spark plug and it can do all of these things at the correct time to properly fire the correct cylinder. For a 4 cylinder engine the typical firing order is 1-3-4-2. What the misfire monitoring routine in the computer does is it looks at the crankshaft sensor signal pulses and it times the intervals between when the four cylinders are coming to the top of their compression strokes. Each time through it times the interval between when cylinder 1 is at TDC and then until when cylinder 3 comes to TDC and then until when cylinder 4 comes to TDC and then until when cylinder 2 comes to TDC and so forth over and over. If the engine is running normally all these timed intervals between cylinder firings should be roughly equal. They will all increase and decrease together as the engine RPM changes but no matter what the engine RPM's currently are at the intervals should remain about the same and roughly equal to one another. This is because the crankshaft is getting equal thrusts of rotational energy from each cylinder. Now let's assume that cylinder 4 has a bad spark plug and it is misfiring. The misfire monitor in the computer will routinely time the interval between cylinder 4 being at TDC and when cylinder 2 comes to TDC. What will happen is that this particular interval will be longer than the intervals between 2 and 1, 1 and 3 and 3 and 4. This is because cylinder 4 is not firing and pushing on the crankshaft and helping to turn it while cylinders 2, 1 and 3 still are. As such the time it will take for the crankshaft to rotate going from cylinder 4 TDC to get to cylinder 2 TDC will take longer than for the other three cylinders because cylinder 4 alone is not firing. When the misfire monitor sees this occurring too many times over a certain number of crankshaft rotations it knows there is a problem and it also know which specific cylinder is causing it. In this example the computer would turn on the check engine light and throw a P0304 code, which is "Cylinder# 4 Misfire".
Great video Dan and family! I wish you could have shown the HC afterwards as well. I know your current ramp verified the fix. It would've been nice to see the after shot with gas analyzer as well though. Now your a professional and I'm a newbie. So would the HC still have been high for a little while even after the fix because any unburned gas in the exhaust system would've still been present until the catalyst warmed up enough to burn those gases or emitted them into the atmosphere? Thank you sir for all of your videos! I've learned so much from you Keith (new level auto), Eric O (sma), Ivan (phad), Paul (scannerdanner), oh and what not to do from Scott (Scotty Kilmer) Thumbs up as always!
Great to hear y UA-cam helps, that's exactly why we are making this video. That gasses don't get stored but just pass the exhaust system. So they are gone in a moment.
Dan, can Snap on Thermal Imager will get this problem, like the way u did in other video or the thermal imager can capture only for 100% DEAD CYLINDER. I was told snap on thermal imager can be used to check COIL as well. not sure how this works
finaly found a video thats pointing to a problem i have on my car. it's a 1996 523i which has the same misfire symtoms, but only when the engine is warmed up, misfires are only there when idling and no fault codes pointing to misfires. when revving up the engine, misfires are less noticable, engine isn't vibrating while driving. misfires are best noticable when listening at the exhaust tip. hope i'll find a bad coil on my car.
I got misfire on my HEMI. No error code. Your videos looks very helpful. Now, could you please list the equipement you used to diagnostic the problem and get it fixed ? Thank you
Great quick video mate. Wish my waekon COP quick probe was as clear as the scope to read! Time to upgrade I feel! 😉 Ps. Great to see the kids learning young but hope ur boy wasnt sitting on the customers car...😯 Pps. Keep up the great team work 😎
what was that yellow probe name? pls share the link to it, there are so many old BMW vehicles in my country and we are not able to test the coils so fast and clear!
@@Diagnosedan Thank you for your quick reply! Your videos are the best! they are quick and to the point-not a lot of wasted talk. I especially liked a couple you have done on can bus-because of you I am now not afraid to look at a problem in there-again thanks so much for everything you do, you are greatly appreciated, more they you may think!
Great video! Subscribed :) Do you think a dirty MAF is possible for slightly high HC? Vehicle passes Dyno smog at 25mph, fails at 15mph. HC is at 60 (max allowable 51). Not high enough for me to think ignition/spark issue, and I haven't cleaned the MAF since I've owned it (6 years) but did plugs, wires, and coils 20k miles ago. No other symptoms apart from fuel economy has dropped 10ish%. No codes and seems to run great
it's just an inductive probe. you can make one out of a coil of wire. That a lot of voltage on the secondary. a scope and a piece of wire should be able to see it pretty easily. Actually, the problem would be seeing all of the coils at once. Some sort of shielding would be necessary.
Hi Mr D ! I have a question. I whant to buy a oscilloscope, and I don't whant to spend too much , as I'm not doing professional repairs yet. :) I have some options. But I need you to guide me as around what frequency the diagnostics of car components go to. I mean like can bus lines ,5v ref , tps signal? Thank you !!! :)
If you want to do it al you'll need a differencial scope but those are expensive. I don't have any experience with lower priced scopes but the Ditex scope looks good.
@@Diagnosedan thanks for the reply Mr D. But in what range of frequency should it operate, 20, 60, 100 hrz? But definitely it will be a two channel one.
@@zfloz9895 www.ryansautomotive.ie/shop/diagnostic-equipment-and-tools/oscilloscopes/laptop-based/gmtotiepie-hs6-diff-4-channel-oscilloscope-set/ Please read over here the frequenty and sample speed is explained. You can than deside what you want to do with a scope and what you need
I wonder if you could help I have a 2011 320i e93 with a hesitation/misfire at 1800 rpm on very light throttle, I have no fault codes. All coils were replaced a year ago and the coils / plugs / injectors have all been checked, o2 sensor has been replaced. My local BMW dealer has not got a clue what the problem could be, the last suggestion was the fly wheel! Could you suggest what it could be? Regards
Hi Dan Been watching your videos and they are great with really good explanation and I am learning loads, Keep up the great work it’s appreciated 👍👍👍👍👍
I got an o7 grand prix 3.8. I put new coil packs new cam shaft and crank shaft sensors plugs wires ignition control module. And still has a mis fire .when get on it every so often like every time wants to shift I think. It's not throwing any code but EVAP but will that cause a miss fire
You don't need a fly smacker do scope coil packs. I usually just put the positive lead on the head of the coil, and the other to ground. Gives roughly the same readout. ;)
Did you happen to measure the resistance of the secondary coils after you did the other test? Do you look to see the condition of the plugs and sell them a tune up while you're there?
Great videos. Thanks for taking your time to do this. 90% of mechanic's are parts changers. Finding the real problem is key to being a truly great mechanic.
Thats a nice comment it's appreciated
I could have figured that one out without a computer. You heard the misfire. Unplug the #1 coil and the engine would have ran worse. Unplug the #2 coil and the engine wouldn’t have changed. Swap #1 coil with #2 and the misfire would have moved to #1 cylinder. Change the #1 coil. Yes I have done this before.
@@blackericdenice Can you send me a link to your channel.
@@Grunter123 everyone has done it like f165 said. I would change all the spark plugs and coils tho 🤷♂️
@@ixdjxl1 I agree Dan, I was just being sarcastic asking him where his channel is if he was so good.
I'm almost done watch ALL your videos. Now I'll watch them again and again. What an amazing bloke you are
Love your channel, Dan.
It's like the olden days of Wheeler Dealers with Edd China doing all the fault finding, fixing and explaining.
We're all better car owners thanks to you.
One suggestion: buy a lavalier / lapel / clip on mic (whatever you want to call it) with a wireless receiver plugged in into your camera.
If you need to put up a crowdfunder for that, I'd be happy to pop in some money.
You are an incredible mechanic/diagnostician. Legend. I would love to learn from working along with you. I would learn more in a day than a year with most mechanics
HI DAN,
IMMEDIATELY VERIFIED MISFIRE BY HC NUMBERS. IT IS A VERY HANY TOOL. NEVER FAILS.
NEXT STEP OSCILLOSCOPE CONFIRM DEFECTIVE COIL. VERY PROFESSIONAL APPROACH; DIRECT TO THE ISSUE.
YOU MADE IT SO EASY; THANK YOU. ALL OF IT LOGIC EACH STEP OF THE WAY. YOU ARE A BIG ASSET TO THE AUTOMOTIVE INDUSTRY. KEEP UP THE GOOD WORK.
This is the best car diagnostics channel I've seen on youtube, by far. I love the kit you've got!
Can you talk about the prices and whether and how good are cheap home units and about typical rental options for expensive equipment?
Wonder if current and duty cycle reading from an amp clamp tried on each coil would have isolated the anomalous (misfiring) coil. DC amp clamps with Hz and % are cheap as chips nowadays.
I watched another channel from a guy in England (I think) who used a coin on top of the coil and a standard probe to pickup the signal from the coil. He showed that by not using the coin he got no signal but by replacing the coin on top of the coil, received the signal again. He said it was a tip he got from an older mechanic he was working with. Pretty neat!
Link?
@@khuramnasar1905
ua-cam.com/video/MOLj5vGIDsg/v-deo.html
I think your description of a transistor being a relay is correct. When it's used to switch current on and off, it is working as a relay. When it's used to modulate a high voltage or current then it is working as an amplifier. The relay analogy is a good one. Great videos.
It’s a real joy to see your videos, I am learning alot and love your detectives work. Nice to see that your children is involved also! Thanks from Sweden
Hey Dan...Greetings from India...Yours is one of the best Auto Troubleshooting Channels on UA-cam...Nice to see your family too...
Dan, your the man! You actually explain this stuff in very easy terms. You make it look so easy. Keep up the great informative videos please I’m sure we all learn a lot from you.
This channel should have over a million subscribers! And it will. Best on UA-cam!
A perfect diagnosis Dan. Great channel thanks for the super camera work Dan Jr. (and your daughter too...)
jools Grudgings, thank you that's a nice comment!
I am new to your channel but have been binge watching them. You are great in explaining your thought process. Thank you for your videos!
Thank you Nick😊
Now that's a lot of "Okay guys" 😁 Your videos have become better and better through the years. Keep it up!
Thanks again Mr : dan , God bless your son and daughter
Bilal Flayeh, Thanks!👍
Thanks Dan , God bless your family , you deserve more likes for your son and daughter . Regards
Both juniors rocks. Thanks to diagnose Dan and family.
Thanks👍
Super video. The waveforms secondary and primary were great. Nice family!! Thank u!
Thanks Bill😊
Awesome video! I’ve been having a similar problem on my Nissan Xterra! Had a intermittent misfire under load (2k rpm) and then sometimes at idle, no codes. The other day the cylinder was dead enough to finaly throw a check engine light! I’ve never been more happy to see a flashing check engine light! Swapped the coil from cylinder 3 (the cylinder at fault) to cylinder 4 and now it’s a waiting game 🫣
Great video. Awesome current waveform diagnosis! My amp clam is one of my favorite tools to use for coil diag. Unfortunately I don't own a cop tester or paddle probe yet. Maybe a Xmas present lol! Scannerdanner used to say coil amp wave forms should have a slope as the current fights resistance as it builds a feild, shorted windings equall the straight up line you showed, if it was zoomed more you would see a very clear straight up line. Great video, you have a lifetime subscriber!
Thank you Cody that's Great 😊
You rock. Love that you have the kids on! Living the dream!
I have just discovered you and you have great job 👏 you have great family congratulations man
Excellent, job well done !
Congratulations on your good-looking kids too, Dan !
Thank you Juergen
nice to see both of your youngsters taking an interest keep it up kids your at a better age to lean this than I am but bcause of yourdad I have learnt more than I all ready knew so it goes with the never too old to learn
That's a good job well done,and the testing procedures are reasonably understandable
Awesome videos Diagnose Dan and I like the outro where you said Diagnose Dan Fixed it again....such a great tag line
Alrick Anglin Thanks!😁
Excellent video! One suggestion. Use dielectric paste when changing COP.
Dan, i would like to thank you! I watched your videos and i got so intrested in car diagnostic that i immitiately went to mechnic shool and gave papers in and car diagnostic one year trade schooling starts from next week already! All thanks to you, always have found it intresting but way you teach got me really thinking that this is the way i want to envolve in future in my garage workshop.
Wish I could have a mechanic like you take a look at my car, I've been having a fault exactly the same as this. I've had all sorts of work done on the car (part changing by guessing mechanics) and it's cost me a fortune and my car is still faulty.
You have very good tools sir 🛠️
Thanks
Great video Dan, I love that you had your children on camera. Beautiful family. God Bless. I have a 2008 Honda Civic with the same noise at the exhaust but no codes, looks like I have a bad coil also, maybe. Thanks for the video, you gave me a place to start looking. God Bless.
Great work Dan and lovely Family.
Tam Couch Thank you on behalf of me and the family👌
Very good team good dad and coach...thanks for sharing this tips.
Your welcome and thanks for watching my video's it's appreciated!
The best School of Auto Engineers!!!Good job!!!
You have great kids! Good job!
Thanks!👍
@@Diagnosedan Your wife has great kids! Did they instruct you on how to diagnose the miss-fire?
Your content is high quality.
Thanks Jay
I love your videos, very informative, don't stop, keep them coming!!
😜
Inspiring! My forester performed strange: daily short drive is fine, but got misfire at cilender 3 n 4, after 1 hour on highway. Can start again a few minutes later. Machanic suspect aged coil inside, but not sure
Well done dan your a good teacher I've learnt plenty. Les uk
Thanks les!
my frind I think you deserve more subscribers
Maybe one day!😊
Loved the kids getting involved, they look like a spitting image of you!
I can and can't wait for my kids to get old enough so I can teach them.
I LOVE seeing the kids getting involved, especially his darling daughter! I loved helping my dad work on cars, and learned a lot of useful info. I helped him bleed the brakes as soon as my legs were long enough to reach the pedal!
He made sure I could change a tire by myself and check all the fluids and other important things. Always keep extra fuses in the glovebox, and a roll of duct tape can't hurt! Nowadays, I also keep an OBD II in the glovebox too.
Daddy's been gone 25 years, but a day doesn't go by that I don't think about him, and his lessons for life.
TOP job Dutch Team !
Thank you and all the best!
Ha ha Thank you!
Excellent step-by-step diag. Thanks!
Thanks for watching!😊👍
Great job guys love video with family in it, supporting, and working together keep it up congratulations
Edas Places 😊
Good video and explanation. What would a wave pattern look like where coil is connected by a plug wire and a short is between the plug and engine? In other words not all of the spark is getting to the plug gap. Thanks.
I've seen cars flash the check engine light and sometimes throw intermittent misfire codes but there were no real misfires. A bad drive belt can cause these symptoms when the belt starts slipping. When the belt slips it will jerk the crankshaft, which upsets the rotational timing between cylinders. Monitoring the timing of the crankshaft rotation between cylinders is how the computer detects misfires so the slipping belt can fool the computer into thinking that you have a misfire when you really don't. If you have a problem like this and the car has high mileage and it still has the original belt try changing the belt, which probably needs to be done anyway.
Interresting👍 Thanks for the feedback!
@kapil pawar Sorry, there is some confusion here. The type of misfire codes I'm talking about are NOT associated with the internal timing belt that drives the camshaft off of the crankshaft. Instead they are false misfire codes that are being generated when an external accessory drive belt or the serpentine belt is slipping intermittently. As I stated in my post as the coupling between any of the driven accessories (alternator, water pump, PS pump, A/C compressor, etc.) and the crankshaft suddenly changes the crankshaft gets jerked, which upsets the timing interval between cylinders. This in turn fools the computer causing it to throw the misfire codes even though there are no real misfires. One obvious hint is if the engine always runs perfectly with no misfires being felt, especially during acceleration, but then you are getting intermittent misfire codes anyway.
To make things really confusing rain can sometimes make a worn or stretched accessory drive belt slip when its wet, but it doesn't slip when its dry. This in turn will cause the false misfire codes but only when it rains. This type of misfire problem can sometimes be associated with bad spark plug wires or a bad coil causing a technician to be seriously misled about what's actually causing the intermittent misfire codes when it's raining.
Sorry for the confusion.
@kapil pawar he is not talking about the timing belt but the drive belt. Slipping could cause the crankshaft to speed up and slow down. The ecu might think this is caused by a misfire😉
@kapil pawar Good question. Let's start with a little review of basic engine theory. On a four cylinder engine you will be getting four pulses off the crankshaft sensor per each crankshaft rotation. Now remember that on a 4 cycle engine the crankshaft goes around twice for every time the camshaft goes around once. Further, remember that each cylinder only fires once for every two times its piston comes up to top dead center (TDC). This is why the computer also needs an additional signal coming off the camshaft position sensor. This camshaft signal lets the computer know what the valve train is doing so the computer knows which two cylinders are firing on this crankshaft rotation and then which two cylinders are firing on the next crankshaft rotation. By knowing all this the computer knows which piston is currently on its compression stroke so it can open the correct fuel injector and fire the correct spark plug and it can do all of these things at the correct time to properly fire the correct cylinder.
For a 4 cylinder engine the typical firing order is 1-3-4-2. What the misfire monitoring routine in the computer does is it looks at the crankshaft sensor signal pulses and it times the intervals between when the four cylinders are coming to the top of their compression strokes. Each time through it times the interval between when cylinder 1 is at TDC and then until when cylinder 3 comes to TDC and then until when cylinder 4 comes to TDC and then until when cylinder 2 comes to TDC and so forth over and over.
If the engine is running normally all these timed intervals between cylinder firings should be roughly equal. They will all increase and decrease together as the engine RPM changes but no matter what the engine RPM's currently are at the intervals should remain about the same and roughly equal to one another. This is because the crankshaft is getting equal thrusts of rotational energy from each cylinder.
Now let's assume that cylinder 4 has a bad spark plug and it is misfiring. The misfire monitor in the computer will routinely time the interval between cylinder 4 being at TDC and when cylinder 2 comes to TDC. What will happen is that this particular interval will be longer than the intervals between 2 and 1, 1 and 3 and 3 and 4. This is because cylinder 4 is not firing and pushing on the crankshaft and helping to turn it while cylinders 2, 1 and 3 still are. As such the time it will take for the crankshaft to rotate going from cylinder 4 TDC to get to cylinder 2 TDC will take longer than for the other three cylinders because cylinder 4 alone is not firing.
When the misfire monitor sees this occurring too many times over a certain number of crankshaft rotations it knows there is a problem and it also know which specific cylinder is causing it. In this example the computer would turn on the check engine light and throw a P0304 code, which is "Cylinder# 4 Misfire".
Just had an intermittent misfire on Honda Pilot on cold engine. Found 2 coils soaked in engine oil from leaking tube seals in valve cover.
Great video Dan and family! I wish you could have shown the HC afterwards as well. I know your current ramp verified the fix. It would've been nice to see the after shot with gas analyzer as well though. Now your a professional and I'm a newbie. So would the HC still have been high for a little while even after the fix because any unburned gas in the exhaust system would've still been present until the catalyst warmed up enough to burn those gases or emitted them into the atmosphere? Thank you sir for all of your videos! I've learned so much from you Keith (new level auto), Eric O (sma), Ivan (phad), Paul (scannerdanner), oh and what not to do from Scott (Scotty Kilmer) Thumbs up as always!
Great to hear y UA-cam helps, that's exactly why we are making this video. That gasses don't get stored but just pass the exhaust system. So they are gone in a moment.
Quick and easy! If you’re Diagnose Dan of course! 😉 Love those E39s!
Nick Nicu, Great cars!😁
Great video Dan keep em coming. Shouting you from Sunny Barbados
We could use a little sun over here, it's cold❄☔🤪
Dan, can Snap on Thermal Imager will get this problem, like the way u did in other video or the thermal imager can capture only for 100% DEAD CYLINDER. I was told snap on thermal imager can be used to check COIL as well. not sure how this works
It will only get it if the temperature difference is big enough
Super Mario diagnostics just mentioned two of the great diagnostic mechanic UA-camrs and Diagnose Dan was one of those two
finaly found a video thats pointing to a problem i have on my car.
it's a 1996 523i which has the same misfire symtoms, but only when the engine is warmed up, misfires are only there when idling and no fault codes pointing to misfires. when revving up the engine, misfires are less noticable, engine isn't vibrating while driving.
misfires are best noticable when listening at the exhaust tip.
hope i'll find a bad coil on my car.
Lovely kids, so nice to get them involved in your video.
Nice video Dan, Can you tell us more about yourself in short video. Keep up the great work.
Ermal Spahiu Sure no problem.
A very proud father..👍👍
A great explanation and nice family thank you Dan.
Thanks for the comment buddy it's appreciated
Good job diagnose Dan, and you have good kids congratulate, God bless👍👍👍👍👍👍👍👍👍👍👍
That's another priceless lesson for me Dan
I didnt know a fly swatter was good for erasing ignition bugs
🤣🤣🤣
wonderful explanation. very good video. thanks DiagnoseDan
Thank you!😊
As usual great diagnostic information
Could you use a clamp probe also for testing secondary waveform (by holding it on top of the coil-same way as you use a coil on plug probe) ?
To feed the scope or just look for a reading? It should pick up some induction. I think it would work with a scope.
I got misfire on my HEMI. No error code. Your videos looks very helpful. Now, could you please list the equipement you used to diagnostic the problem and get it fixed ? Thank you
A real teacher, Thank you
Let this FIX from here onward be known as the SPATULA SOLUTION. Good one DAN>
Gracias por compartir maestro DAN.
Your welcome James 😊
Yes you have done it right again like that magic wand on top of the coil modern equipment and modern technology you can't beat it.
Great quick video mate. Wish my waekon COP quick probe was as clear as the scope to read! Time to upgrade I feel! 😉
Ps. Great to see the kids learning young but hope ur boy wasnt sitting on the customers car...😯
Pps. Keep up the great team work 😎
84sneaky Thank you sir!😁
Great job Great channel. All the best, Harry UK
HazTech 1 Thank you!👍
You can also swap 2 coils. To see if it moves. If not, its not the coil....
Yes but the video is about this type of testing, i've showed the coil swap in other video's 😊
what was that yellow probe name? pls share the link to it, there are so many old BMW vehicles in my country and we are not able to test the coils so fast and clear!
What is that diagnostic machine fly stick.?
You are the best..
Dan that was good! Although a bad coil wire would give the same readings, no??
what tools did you use? what was the scope, wand and wiring diagram source?? thanks for another GREAT video! I am in the USA.
Gmto scope visit the Ryans Automotive website for more information! You can also go to the Gmto website or send them a message!
@@Diagnosedan Thank you for your quick reply! Your videos are the best! they are quick and to the point-not a lot of wasted talk. I especially liked a couple you have done on can bus-because of you I am now not afraid to look at a problem in there-again thanks so much for everything you do, you are greatly appreciated, more they you may think!
Great video! Subscribed :)
Do you think a dirty MAF is possible for slightly high HC? Vehicle passes Dyno smog at 25mph, fails at 15mph. HC is at 60 (max allowable 51). Not high enough for me to think ignition/spark issue, and I haven't cleaned the MAF since I've owned it (6 years) but did plugs, wires, and coils 20k miles ago.
No other symptoms apart from fuel economy has dropped 10ish%. No codes and seems to run great
it's just an inductive probe. you can make one out of a coil of wire. That a lot of voltage on the secondary. a scope and a piece of wire should be able to see it pretty easily. Actually, the problem would be seeing all of the coils at once. Some sort of shielding would be necessary.
Great job! Can you provide list of tools you was using?
Where can I get that sensor tool you used for the secondary inspection not the amp clamp ?
Great to see the kids joining in 👍👍👍👍👍
Great Videos. Thanks for educating us.
awesome job my man, I subscribed
Hi Mr D !
I have a question.
I whant to buy a oscilloscope, and I don't whant to spend too much , as I'm not doing professional repairs yet. :)
I have some options. But I need you to guide me as around what frequency the diagnostics of car components go to. I mean like can bus lines ,5v ref , tps signal?
Thank you !!! :)
If you want to do it al you'll need a differencial scope but those are expensive. I don't have any experience with lower priced scopes but the Ditex scope looks good.
@@Diagnosedan thanks for the reply Mr D. But in what range of frequency should it operate, 20, 60, 100 hrz? But definitely it will be a two channel one.
@@zfloz9895 www.ryansautomotive.ie/shop/diagnostic-equipment-and-tools/oscilloscopes/laptop-based/gmtotiepie-hs6-diff-4-channel-oscilloscope-set/
Please read over here the frequenty and sample speed is explained. You can than deside what you want to do with a scope and what you need
I wonder if you could help I have a 2011 320i e93 with a hesitation/misfire at 1800 rpm on very light throttle, I have no fault codes. All coils were replaced a year ago and the coils / plugs / injectors have all been checked, o2 sensor has been replaced.
My local BMW dealer has not got a clue what the problem could be, the last suggestion was the fly wheel!
Could you suggest what it could be?
Regards
Hi Dan
Been watching your videos and they are great with really good explanation and I am learning loads,
Keep up the great work it’s appreciated 👍👍👍👍👍
Thanks Lee!👍
Your Family very sweet.thank you
Thank you😊
Very cool video mate 👍love your test equipment
I got an o7 grand prix 3.8. I put new coil packs new cam shaft and crank shaft sensors plugs wires ignition control module. And still has a mis fire .when get on it every so often like every time wants to shift I think. It's not throwing any code but EVAP but will that cause a miss fire
You don't need a fly smacker do scope coil packs. I usually just put the positive lead on the head of the coil, and the other to ground. Gives roughly the same readout. ;)
There was a fly sitting on that coil, that's why i used it😉
Good job team!
Moving Up Diy Thanx!
CAN u provide a link to that ignition probe? I've never seen one that shows the waveform! only ones with led indicators.
Hi Dan,what diagnostic tool are u using?and what the best all rounder diagnostic tool do u this is best?
In this video I'm using the Autologic. It really depends on what vehicles your working.
Great video Dan😊😊😊😊. Thanks for sharing!! 😊😊😊😊.
Nice equipment, great video
Thanks!
Did you happen to measure the resistance of the secondary coils after you did the other test? Do you look to see the condition of the plugs and sell them a tune up while you're there?
No and No😉
Thanks, I guess the kids are all grown up. Nice family.
I know love that ratchet as well. Use it all day every day
What software are you using? And by the way thank you for sharing your knowledge with us.
Great video what kind of scope is that?
Instead of that probe can you use an oscilloscope probe with ground connected to the tip of probe?