I did plugs and coils, based on what the dealer said. It did fix anything. I was disgusted and scrolling videos when I watched yours. I put a new o2 sensor in and light is out idles perfectly! THANK YOU.
you sir are awesome!!! i never would have given an o2 sensor a 2nd thought to make it misfire.. after using this video as a guideline, i was able to find with my scan tool the misfire cylinders, and when i saw they were 1,3,5. bank against fire wall 2015 caravan, i thoguht maybe a bad head as i already replaced the 2,4,6 front head.. so after i completly reset the codes, fuel trim etc. and it defaulted to factory setting the van ran great no misfires. etc.. then after a short while about 15 min running / driving. came back and check engine code etc. so at that point i was convinced it was not mechanical like the head and had to be fuel being cut off or spark being cut off etc. so i proceeded to replace the upstream o2 sensor and now running perfect. thanks for sharing this video.
Always use NGK on Chrysler built jeeps. But thank you for the explanation, having very similar issue with with a grand Cherokee. Just going to do all 4 since it’s over 100k miles.
You're awesome dude! Exact same codes. Gave me the confidence that the O2 sensor was the issue. Same exact conditions. Saved me a tow to the dealership, time, and throwing money at the low hanging fruit fixes there.
Literally the same symptoms with bank 1 happened with our 2014 town and country. Swapped plugs and coils with bank 2 and replaced upstream and downstream o2 sensor on bank 1. The problem is now resolved and I also used the bosch sensors. I thought the same thing with the design of the bosch sensors
@@oatmealxyz i have a 2015 thats gotten a new engine and still rough idle and cylinder 5 misfire. The mechanics gonna check the wiring harness and see if thats it
@@ROCKETMANN56 long block or short block engine? Or used? Your old cylinder heads could cause misfires if not properly rebuilt. Does it still have the stock catalyst on both sides? (Do they both look like they came from the same manufacturer) maybe something to ask your mechanic😉Best of luck to you finding your misfire issue! Btw, the harness is about a $2K part and hard to get to-maybe look into that as a last resort.
For those who are having this issue I to am repairing an vehicle with same issue and it's being caused by leaking valve cover gaskets and oil dripping down onto o2 1/1 !!
same problem. now 1/1 is fine but the 1/2 is post lean even after replacing it with ngk. Might replace 1/1 again but with ngk or use a non fouler on 1/2.
I had a misfire on cylinder 2 and took it in and did a compression test and they said I had cracked head so my extended warranty had everything checked and got both heads and everything else on the engine block replaced with Mopar replacement parts and cost me 100 bucks for a 10000 dollar job
My jeep have a cylinder 2 misfire I change the coil and the spark plugs and the intake gaskets I checked the connection that the coil connects to and I’m gettin no voltage through the wire that connects to the coil so I’m thinkin it’s the fuel injector wiring harness connector
I have a 2015 Grand Cherokee that now has a PO305 code and shakes at low RPM and sometimes bucks during acceleration. I am preparing to change the plugs and coil packs. I have heard coil packs don't typically go back but is sounds like you have had them go bad correct? Do you have a reliable way to test them?
@@damionchanthavy1938 I just replaced the plugs and coils on mine added some fuel injector cleaner and it worked for a few days and code came back so I am changing all the fuel injectors
Hey bud! Thanks for this video, I am getting p0303 and p0305 cylinder 3 and 5 misfire code on my 2012 Jeep Grand Cherokee 3.5L V6 pentastar, changed all the plugs and ignition coil for cylinder 3 and cylinder 5, engine light comes on again after driving for 15-20 mins with same codes, What should be the next step, O2 sensor or one of my mechanic said it may be Camshaft, lifter and rockers but it drives without any shakes or vibration and there is a very minor rough idle when I do a cold start, can it be the camshaft? Any help would be appreciated man!
Question. I have a 2012 grand Cherokee 3.6. The engine light comes on. Misfire cylinder 4. Then goes off a few days later on it’s own. Then a month later it pops back on. This continues after the spark plugs and wires were replaced. Any idea what might be causing this??
@@GG-ry8dx it’s still doing it. It’s weird. Runs as smooth as brand new. I don’t know?? Maybe I’ll replace the coil for cylinder 4?? See what that does.
Jeep 3.6L typically internal valve train causing misfire. Common issue with Jeeps. Check compression at cylinders prior to changing plugs, coils or injectors.
I have a 2018 jeep grand Cherokee 3.6 im having a missfire cylinder 3 i change spark plugs and coils runs good for 2 months and check engine light comes back with the code missfire on cylinder 3 any ideas. Thanks
Hi, so I have a 2014 jeep grand cherokee 3.6, I had a code p0303 code last year, changed all coil packs, spark plugs, and injectors. A year later and same code popped up, ran into your Video. Any advice is appreciated
The engine is noise on top? This engine 3.6 is common get damage the rocker arms. If is making noise you neeed to remove the valve cover and inspection the camshaft. It can be also the engine in cylinder 3 have exhaust valve burn. And is losing compression from the valves.
Question i have a wrangler 2014 sport engine code is for P0303, Did coils + Spark plug + Fuel injecto, It idles good bery minimum the feeling of the mssfire almost like its nothing.. you think it could be 02 sensor? Code scan on autozone shows spark plug / Coils but like stated they have been replaced
Sometimes certain manufactures self diagnoses maybe unreliable (in rare cases) male sure you're on the proper bank at the proper cylinder. Number 3 seems to be on passenger side bank in the middle on this truck. Try pulling all the plugs and inspecting them well while looking abnormalities in oddities with the outliers. Like fouling or damage plug. Try swapping plugs And coils to opposite bank to see if the misfire move. Check valve train...
@jhonGze I understand You now. This only get more complex from here. You'll need to check for powers and ground at cylinder 3 with injector and ignition. You'll have to pull things down so you can test injector circuit. Easiest way without having high tech equipment is using a multi meter and test light. Compare values with a working cylinder. Example, cylinder 1 works. See if with key on engine off you have same voltage or ohm value at same wires.
Would this be in the neighborhood of a p0171 misfire? Im having a misfire of 4,5,6 and a lean code, spark plugs have been changed...2018 jeep Cherokee high altitude
@buckweezy1942 Yeah, you need to very do specific with me in regards to symptoms and testing if you need help from me. There are too many variables with these cars to be vague. I need data info from your engine computer, such as fuel trims and o2 sensor operation. Your testing procedure with the isolated issue, what was tested, and how. Any other work completed etc. These cars aren't simple. If you don't have at least a bidirectional scan tool or scanner that gives live data, I can't help you.
lol. That O2 sensor plugin has to be in the worst spot ever. Against the firewall under the engine/pipes/pcv and then a cpl inches up. Reach with all mercy squishing your arm for dear life and have 1 finger to reach up push in and tug at the same time. This mechanic has huge arms too.
I have a 2012 jeep grand cherokee I replace the o2 sensor and fuel injector spark plugs and the o2 sensor coil and light still comes on when I start driving it that's the only sensor that is giving me problems it says that's is a misfire but haven't got the issue?
@arelilopez1770 Google the cylinder banks for your engine... pull cylinder 2 plug and coil and swap with a neighboring. Clear code and see if it following the new cylinder
Had same problem changed coil packs and plugs ran good for a day then started misfiring again. Scanned and it came back as misfire cylinder 4 same exact code as the first time before I changed the plugs and coil packs. Ended up being a bad infector cylinder 4 …
thats the 2th and 6th problem by my Granny ,, BUT WAIT , there is MORE ,, first was the spark. plg. then the oxygen Sensor then ,, Rellais , then was the Spark.plg. THEN was the injectors.. then was again the map sensor, then again the oxygen Sensor again ,,, It was about 5000 Bucks,, I got to say ,,, the shittiest Engine in the world ,,,,
I did plugs and coils, based on what the dealer said. It did fix anything. I was disgusted and scrolling videos when I watched yours. I put a new o2 sensor in and light is out idles perfectly!
THANK YOU.
Paul what year is the jeep? I'm having issues with mine right now, replaced all spark plugs, and cylinder 3 coil, but it didn't help.
@@kieferyoung1317 what cylinders misfiring
@Kiefer Young how did you fix it?
@Kiefer Young What was wrong ?
you sir are awesome!!! i never would have given an o2 sensor a 2nd thought to make it misfire.. after using this video as a guideline, i was able to find with my scan tool the misfire cylinders, and when i saw they were 1,3,5. bank against fire wall 2015 caravan, i thoguht maybe a bad head as i already replaced the 2,4,6 front head.. so after i completly reset the codes, fuel trim etc. and it defaulted to factory setting the van ran great no misfires. etc.. then after a short while about 15 min running / driving. came back and check engine code etc. so at that point i was convinced it was not mechanical like the head and had to be fuel being cut off or spark being cut off etc. so i proceeded to replace the upstream o2 sensor and now running perfect. thanks for sharing this video.
Always use NGK on Chrysler built jeeps.
But thank you for the explanation, having very similar issue with with a grand Cherokee. Just going to do all 4 since it’s over 100k miles.
You're awesome dude! Exact same codes. Gave me the confidence that the O2 sensor was the issue. Same exact conditions. Saved me a tow to the dealership, time, and throwing money at the low hanging fruit fixes there.
Great video! I liked “how does this damn thing work”😂😂
Awsome diagnosis. Thank you
This is the best to many people have a car.Keep sharing
Literally the same symptoms with bank 1 happened with our 2014 town and country. Swapped plugs and coils with bank 2 and replaced upstream and downstream o2 sensor on bank 1. The problem is now resolved and I also used the bosch sensors. I thought the same thing with the design of the bosch sensors
I've been struggling with several pentastar misfires lately, I am going to check this method out, thanks for sharing!
Did the O2 sensors fix it?
@@melanieshepherd6812 no, it ended up being the engine harness-rubbed through in several places behind the cylinder heads
@@oatmealxyz Interesting!
@@oatmealxyz i have a 2015 thats gotten a new engine and still rough idle and cylinder 5 misfire. The mechanics gonna check the wiring harness and see if thats it
@@ROCKETMANN56 long block or short block engine? Or used? Your old cylinder heads could cause misfires if not properly rebuilt. Does it still have the stock catalyst on both sides? (Do they both look like they came from the same manufacturer) maybe something to ask your mechanic😉Best of luck to you finding your misfire issue! Btw, the harness is about a $2K part and hard to get to-maybe look into that as a last resort.
Excellent diagnostic process bro
Dude you save my life !
For those who are having this issue I to am repairing an vehicle with same issue and it's being caused by leaking valve cover gaskets and oil dripping down onto o2 1/1 !!
Thanks. Gonna check!
same problem. now 1/1 is fine but the 1/2 is post lean even after replacing it with ngk. Might replace 1/1 again but with ngk or use a non fouler on 1/2.
brother thank u ..same problem and i change it and it was the same thing u are the man
I had a misfire on cylinder 2 and took it in and did a compression test and they said I had cracked head so my extended warranty had everything checked and got both heads and everything else on the engine block replaced with Mopar replacement parts and cost me 100 bucks for a 10000 dollar job
ez subscribe , thanks for sharing. looking forward to more
Good job bud..& Your a very good tech...
My jeep have a cylinder 2 misfire I change the coil and the spark plugs and the intake gaskets I checked the connection that the coil connects to and I’m gettin no voltage through the wire that connects to the coil so I’m thinkin it’s the fuel injector wiring harness connector
It’s good it wasn’t head gasket it valve stem seat cracked. They have lot of those on bank 1 .3.6 engine all generations
Good to know! Thanks
Thank you.
I have a 2015 Grand Cherokee that now has a PO305 code and shakes at low RPM and sometimes bucks during acceleration. I am preparing to change the plugs and coil packs. I have heard coil packs don't typically go back but is sounds like you have had them go bad correct? Do you have a reliable way to test them?
i have the same exact thing in mine. i’ve been told it could be the fuel injectors so i would check that
@@damionchanthavy1938 I just replaced the plugs and coils on mine added some fuel injector cleaner and it worked for a few days and code came back so I am changing all the fuel injectors
I did not have this code, had a p219B and was doing what your symptoms are.. turned out to be bank 2 VVT solenoid
I have the same issue I’ve changed sparks and coils was getting misfire cylinder 3 now on cylinder 1
@@adrianhernandez7862 I'm having the same exact issue. Changed sparks and coils but still misfiring. Any idea?
Hey bud! Thanks for this video, I am getting p0303 and p0305 cylinder 3 and 5 misfire code on my 2012 Jeep Grand Cherokee 3.5L V6 pentastar, changed all the plugs and ignition coil for cylinder 3 and cylinder 5, engine light comes on again after driving for 15-20 mins with same codes, What should be the next step, O2 sensor or one of my mechanic said it may be Camshaft, lifter and rockers but it drives without any shakes or vibration and there is a very minor rough idle when I do a cold start, can it be the camshaft? Any help would be appreciated man!
Just had plugs and coils changed cylinder 2 still misfiring did compression test and was told cylinder valve needs to be replaced
Daddy rolling here again hope you are doing good God bless !
Hey mommy😎 I'm cool, been busy, what's new with you?
@@partsshooter great nice to hear that daddy well I am all good too been busy at work too nothing new hehehe because I everyday brand new 😜😅🥰
@@lifewithcarmel5444 you still at the hotel right?
@@partsshooter yes I am dad why?
@@lifewithcarmel5444 because I'd imagine you'd own the place working so much
Question. I have a 2012 grand Cherokee 3.6. The engine light comes on. Misfire cylinder 4. Then goes off a few days later on it’s own. Then a month later it pops back on. This continues after the spark plugs and wires were replaced. Any idea what might be causing this??
My sons Jeep the same comes up P0302
@@GG-ry8dx exactly.
@@GG-ry8dx it’s still doing it. It’s weird. Runs as smooth as brand new. I don’t know?? Maybe I’ll replace the coil for cylinder 4?? See what that does.
@@retiredwelder Switch coils and see if the misfire code moves with it.
Jeep 3.6L typically internal valve train causing misfire. Common issue with Jeeps. Check compression at cylinders prior to changing plugs, coils or injectors.
Hi bro l missfire p0300 cliynder 1 3 5 any idea jeep 2012 do you think o2 sonser
Did you founf something on your problem
Was the sensor for bank one only
The sensor bank 1 and 2 are the same ??? Can you send the part number ? I have misfire at cyl 2 , 4 , 6 so bank 2
You never showed how you took the old one out.
I have a 2018 jeep grand Cherokee 3.6 im having a missfire cylinder 3 i change spark plugs and coils runs good for 2 months and check engine light comes back with the code missfire on cylinder 3 any ideas. Thanks
Try swapping cylinder 3 with a neighbor cylinder and see if the misfire move. Change the coil and plug over
Hi, so I have a 2014 jeep grand cherokee 3.6, I had a code p0303 code last year, changed all coil packs, spark plugs, and injectors. A year later and same code popped up, ran into your Video.
Any advice is appreciated
The engine is noise on top?
This engine 3.6 is common get damage the rocker arms.
If is making noise you neeed to remove the valve cover and inspection the camshaft.
It can be also the engine in cylinder 3 have exhaust valve burn. And is losing compression from the valves.
I have Jeep Grand cherokee 2011 i nees help ihave miss fire but i can fixed
Keep it up daddy 😁
You know I don't have a problem doing that😂
@@partsshooter yes daddy start safe just done
Nice video, thanks man.
Question i have a wrangler 2014 sport engine code is for P0303, Did coils + Spark plug + Fuel injecto, It idles good bery minimum the feeling of the mssfire almost like its nothing.. you think it could be 02 sensor? Code scan on autozone shows spark plug / Coils but like stated they have been replaced
Sometimes certain manufactures self diagnoses maybe unreliable (in rare cases) male sure you're on the proper bank at the proper cylinder.
Number 3 seems to be on passenger side bank in the middle on this truck.
Try pulling all the plugs and inspecting them well while looking abnormalities in oddities with the outliers. Like fouling or damage plug. Try swapping plugs And coils to opposite bank to see if the misfire move.
Check valve train...
@@partsshooter so even after replacing all 6 spark plugs and coils, Even tho missfire is just for cylinder 3, i should swap the coils around?
@jhonGze I understand You now.
This only get more complex from here. You'll need to check for powers and ground at cylinder 3 with injector and ignition.
You'll have to pull things down so you can test injector circuit. Easiest way without having high tech equipment is using a multi meter and test light. Compare values with a working cylinder.
Example, cylinder 1 works. See if with key on engine off you have same voltage or ohm value at same wires.
Would this be in the neighborhood of a p0171 misfire? Im having a misfire of 4,5,6 and a lean code, spark plugs have been changed...2018 jeep Cherokee high altitude
Yes
@@partsshooterbank 1 02 sensor upstream replaced yesterday.....still getting codes
@buckweezy1942 Yeah, you need to very do specific with me in regards to symptoms and testing if you need help from me. There are too many variables with these cars to be vague.
I need data info from your engine computer, such as fuel trims and o2 sensor operation. Your testing procedure with the isolated issue, what was tested, and how. Any other work completed etc.
These cars aren't simple. If you don't have at least a bidirectional scan tool or scanner that gives live data, I can't help you.
@@partsshooter 10/4
How did you get the sensor out?
lol. That O2 sensor plugin has to be in the worst spot ever. Against the firewall under the engine/pipes/pcv and then a cpl inches up. Reach with all mercy squishing your arm for dear life and have 1 finger to reach up push in and tug at the same time. This mechanic has huge arms too.
I have a 2012 jeep grand cherokee I replace the o2 sensor and fuel injector spark plugs and the o2 sensor coil and light still comes on when I start driving it that's the only sensor that is giving me problems it says that's is a misfire but haven't got the issue?
I need more info, what are the codes for check engine light?
I'm trying today and check the codes because is having problems starting now
@@partsshooter p300 and p302
@arelilopez1770 Google the cylinder banks for your engine... pull cylinder 2 plug and coil and swap with a neighboring. Clear code and see if it following the new cylinder
Had same problem changed coil packs and plugs ran good for a day then started misfiring again. Scanned and it came back as misfire cylinder 4 same exact code as the first time before I changed the plugs and coil packs. Ended up being a bad infector cylinder 4 …
thats the 2th and 6th problem by my Granny ,, BUT WAIT , there is MORE
,, first was the spark. plg. then the oxygen Sensor then ,, Rellais , then was the Spark.plg. THEN was the injectors.. then was again the map sensor, then again the oxygen Sensor again ,,,
It was about 5000 Bucks,,
I got to say ,,, the shittiest Engine in the world ,,,,
Hi I have a 2011 grand cherokee 3.6L , misfire numbr 2 ! I want to know is it on passenger side or driver side . Thx
Bank 1 is passenger side... Bank 2 is driver side
Driver side cylinder #2 bank 2
Hey help me
My 2009 Cherokee misfire 1 3 5 mechanic say engine crazy
Oxygen sensor on the passenger side read the live data with a scan tool and see what o2 sensor isn't fluctuating like the others
Let me no what you found its intresting
Green video
Hi bro l missfire p0300 cliynder 1 3 5 any idea jeep 2012 do you think o2 sonser
Same here that's what he's doing