Thank you for this information I have a 2000 buirk .And the man said that I have a leak and they were going to do a smoke and this film helps me to understand what he was talking about .Thank you .
I wish I had you as an instructor earlier in life. Man you know your stuff. The 2000 Focus PVC hose was my problem. Fixed it in 10 minutes and the car runs like new. Once again Sir, thank you for the Videos.
wow your videos are the only ones i refer too, your like a encyclopedia of the auto-mechanic answers, keep up the good work, i just bought a tool from your link, i remember you saying it helps you continue to keep making these videos, so i'll be ordering alot more for sure/ plus you already show us how to use them keep up the great videos dwayne
I just changed the valve cover gaskets and all intake and plenum metal gaskets and upon torquing everything to spec following the bolt tightening sequence in the manual, I’m now getting a p0171 and p0170 on my 2002 Honda Odyssey. I’ve visually inspected all hoses and taken it all apart 3 times already and still can’t find the source of the leak. All 6 injectors are also new and OEM. I’m stumped
If you looked at the fuel trim at idle, you would see Positive numbers but, if you raised the RPM, they would drop due to the vac dropping. This points to a vac leak.
you can use propane or carb cleaner ( carb cleaner is less safe since it coats surfaces and could ignite) however you just spray alittle around area's that could be pulling in outside air (intake area's, vaccum lines, etc) until the engine revs.. once you get it reving from spraying in one spot off and on you know where your leak is. i think "realfixesrealfast" have a video on using propane to find a leak. Also "Ericthecarguy"channel has one as well on how to use carb cleaner method. cheers
Nice video, you work methodically. Please don't forget us shade tree guys, who probably won't have that fancy smoke machine. How would a spray can of carb cleaner worked?
Also need to do a fuel volume test before writing off fuel delivery.Most techs know right away when both banks are lean it is a air mass sensor or a vacuum leak that services both banks.When a car lopes at idle or runs poorly at idle it is most often a vac leak.Your vacuum is highest at idle.That sucks in more air than in running conditions.Any tech that goes after fuel delivery first in that situation is scamming the customer or warranty.I do like the smoke machine for diagnostic more than the method we used.
The new lower intake gaskets are green from GM. Have not seen aftermarket yet. Those old ones had some miles. Fuel trim would have pointed to this too.
I got a P0171 code in my Chevrolet 5.7 LS1 V8 powered Holden Commodore last week but I didn't have a smoke machine to diagnose this,the O ring on the fuel filler cap had a split in it,it was only noticeable when the car sat for a few minutes then the engine was restarted at a service station for example - a fault code or codes would be set, previously,I also got a P0174 code as well. So I checked the obvious things first,note the fuel tank wasn't holding vacuum,note Holden didn't fit a fuel tank pressure sensor so the P0442 code is irrelevant in my car. I would consider making my own smoke machine but the obvious things such as the MAF sensor clamps coming loose have caused a P0102,P0171 & a P0174 code in the past !
quick thought here, it should hold pressure when powered and/or commanded on. Check the vent valve, may be stuck open and causing it NOT to hold pressure
The tank should be under a vacuum which it is,when I fitted the new fuel filler cap,I noticed a drop in idle speed for a few seconds then the idle speed stabilized at its normal idle speed so that tells me that the EVAP system is functioning correctly when the engine is running !
1997 F-150 was getting po171, lean 1 bank, under the hood I found a pvc hose had came off, also clean MAF sensor with maf spray cleaner...cleared code at auto part store...lite never has came back since...
that system may take a couple "trips" for the monitor to recognize a real fault from a intermittent fault. Drive it for a few days and if it doesn't come back on, then it's most likely fixed.
Great vid!👍🏼I hav po171 on my 2008 pont vibe and car has No symptoms - purrs. I’ve chkd maf sensor and intake valve gaskets. Gonna try and chk fuel pressure as everything else looks good. Also, it predominantly happens in cold weather - any suggestions??😣 Thx
Was the gasket leaking on both banks as DTC po171 & po174 reports?? Vid shows only one gasket / bank leaking smoke. If only one side, then why did both banks get reported?
with one bank running lean the system o2s and trys to rich the mixture causing an imbalance in the engine so if left long enough the computer will try to compensate for both banks it (the ecm tune) only being allowed to add so much extra fuel will set both DTCs also the intake can change as it heats up causing the other bank to lean out too as it expands
great video! I have a 2002 vw jetta turbo, and took it to goodyear and they mention I need to replace a "Hose to Snorkel" what is that? they said i have to get it from the dealer. or were this part located at... the code coming up is P0171 Lean Bank 1
I was watching a video and saw this post. Im not a certified mechanic or anything (just a guy thats owned and worked on a lot of different cars) but I'd think it was your water pump or possibly a stuck thermostat..Hopefully you've found the solution already, now that I seee this was a month ago
Will that make it throw codes on one bank and not the other? Im getting po300 code and crappy idle at cold starts also not functioning solenoid vent valve on my 03 Tahoe,oh also bank 1 sensor 1 low voltage and heat codes
I have a P0174 on my 02 Lexus RX300 . If it’s a low fuel pressure,it should be both banks,right ? When I drive,it runs very good. But at idle, it shakes a little bit. That indicates a vacuum leak,right ? Thanks
hi, when u do smoke test, I assume some of the cylinder will be in intake or exhaust stroke even if we had first cylinder in TDC, this means i will always find smoke coming out in exhaust or in throttelbody , is my understanding correct. I know you have sealed breather house but have not exhaust side, can u please advise if i have misunderstood something
sir,my respect to you,your videos are very helpful,i really enjoyed this,and learned something new every time i watch them,i have a mustang gt 99,do u have any videos recommendation?
When I do the smoke test on my 99 camry, smoke comes out of the EGR modulator filter. Is this normal? Should I seal it and keep looking? I've got P0171 , the car idles poorly, and I can hear a hissing noise.
I have the the same to lean codes on my 01 Ford Explorer Sport, 4.0, 6cly. I now have had a few vacuum hoses that needed to be replaced, replace the pcv valve, replaced the fuel filter & I just spent quite a bit of money to replace my upper & lower intake gaskets. Still have the same 2 codes. I ordered a new MAF that will be arriving today. If that does not fix it, what else should I do or have done? I'm losing my mind here.
I have a 2001 2500hd 6.0 and the engine shutters only when I hit a bump, and P0174 comes up on my programmer. what would be the cause in this case? I tried shaking wires under the hood and under the truck while running but didn't shake anything that made the engine miss. any ideas?
can oxygen sensors triger this codes.. i have 07 avalanche new body style.. check intake leaks and replaced maf sensor.. fuel pressure is at 60.. also good .. now im down to think its oxygen sensors.... any help?
Hi I came across your vid today and I was wondering if you could answer a quick question? I have a 2001 Ford F-150, i did a smoke test because of a lean code I am getting. The only place the smoke came out was from a little round vent cap on the IAC valve. Is that little vent cap supposed to leak smoke? I remember doing a smoke test on my truck a few years back for a pcv valve hose leak and I don’t remember that cap ever leaking before. The only reason I’m questioning this is because I saw a couple posts online about this and I saw some people had said that vent cap will leak smoke during a smoke test. But again, when I did this test a few years back I think I would’ve noticed it. Thank you much appreciated
realfixesrealfast Okay thank you so much for the response. Lol all day at work I kept going back and forth in my head if it should or not. Thank you again
hi, can you pliz help i have my c230 v6 2007 and it runs so smooth but it is showing the check engine light and i checked it and it gave me this code. i cleared the error but it comes out after a 5 to 10 kilometers of drive Self-adaptation of mixture formation for enrichment at partial load for the left cylinder bank is above the permissible limit. (P0174) Self-adaptation of mixture formation for enrichment at partial load for the right cylinder bank is above the permissible limit. (P0171
You put the wrong gaskets on the car. GM had a TSB on this. The updated gaskets are teal in color. Your customer will have this issue again if they keep the car long enough.
Hello, I have 2.0 96 contour. Had it smoke tested and smoke came out egr valve vent holes. Guy didn't block off intake or exhaust just put snapon smoke machine onto valve cover. Is the smoke leaking from those vent holes normal because it may have a positive pressure egr? He said not supposed to leak another shop said same, but I've read it may be normal on some cars. Please reply because I'd greatly appreciate it because I'm getting contradictory information. Thanks
I got two trucks with the same problem. Its a s10 with 4.3 and a Van with 5.7. I changed MAF sensors on both trucks. S10 ran alot better after that and van is the same. Also both exhaust manifolds on both trucks turn CHERRY RED after running it. S10 gives a codes P0171 and P0147 ocassionally. I would greatly appreciate any help. Thanks alot
Hi , my name is Dan .I have the same codes coming up I put a new air flow sensor and it gives me the same codes I looked for leaks but did not find any could it be the 02 sensors are bad? Thank you dan ,it's a chevy silverado 2000
Daniel Cortes you may need to reprogram/update your pcm with the latest software, ive fixed a few of the like that after veryfying that nothing else is wrong
The greatest mechanic/educator ever to post in UA-cam. Over the last few years you have elevated my mechanical knowledge tenfold. Thank you!
Thank you for this information I have a 2000 buirk .And the man said that I have a leak and they were going to do a smoke and this film helps me to understand what he was talking about .Thank you .
I wish I had you as an instructor earlier in life. Man you know your stuff. The 2000 Focus PVC hose was my problem. Fixed it in 10 minutes and the car runs like new. Once again Sir, thank you for the Videos.
wow your videos are the only ones i refer too, your like a encyclopedia of the auto-mechanic answers, keep up the good work, i just bought a tool from your link, i remember you saying it helps you continue to keep making these videos, so i'll be ordering alot more for sure/ plus you already show us how to use them keep up the great videos dwayne
You never explained how an intake leak into the passenger side bank also throws a code in the drivers side bank? Please let us know.
Thank you for the nice video, I always enjoy the way explains the repairs. have a great day.
That was awesome sir..!!!
You are really a good tech.
Props to you boss.
i can tell that my old man knows what he is doing.
Amen Brother!
Mine is doing some weird stuff with 171, 174 with occasional 300...
Thank you for teaching me this.
Awesome video! I don't have a smoke machine but I have a friend that is a Smoke Machine
I just changed the valve cover gaskets and all intake and plenum metal gaskets and upon torquing everything to spec following the bolt tightening sequence in the manual, I’m now getting a p0171 and p0170 on my 2002 Honda Odyssey. I’ve visually inspected all hoses and taken it all apart 3 times already and still can’t find the source of the leak. All 6 injectors are also new and OEM. I’m stumped
If you looked at the fuel trim at idle, you would see Positive numbers but, if you raised the RPM, they would drop due to the vac dropping. This points to a vac leak.
you can use propane or carb cleaner ( carb cleaner is less safe since it coats surfaces and could ignite) however you just spray alittle around area's that could be pulling in outside air (intake area's, vaccum lines, etc) until the engine revs.. once you get it reving from spraying in one spot off and on you know where your leak is. i think "realfixesrealfast" have a video on using propane to find a leak. Also "Ericthecarguy"channel has one as well on how to use carb cleaner method. cheers
thank you sir for your video,its a big help to person that they need to fix by herself,im appreciate it.your a very good technician,,
thankyou very much for that information, have a ford Windstar with those recurring codes ....
Excellent video great details, great results. This did not save me money but it made me money!! Thank you!
Sometimes leaks open up when the engine is hot or cold.
Nice video, you work methodically. Please don't forget us shade tree guys, who probably won't have that fancy smoke machine. How would a spray can of carb cleaner worked?
Also need to do a fuel volume test before writing off fuel delivery.Most techs know right away when both banks are lean it is a air mass sensor or a vacuum leak that services both banks.When a car lopes at idle or runs poorly at idle it is most often a vac leak.Your vacuum is highest at idle.That sucks in more air than in running conditions.Any tech that goes after fuel delivery first in that situation is scamming the customer or warranty.I do like the smoke machine for diagnostic more than the method we used.
Man I need one of those machines so badly lol I've been dealing with a P0171 for 3 months
I don't know if you got your problem fixed but mine turned out to be a brake booster the had a hole in the diaphragm.
The new lower intake gaskets are green from GM. Have not seen aftermarket yet. Those old ones had some miles. Fuel trim would have pointed to this too.
Thanks this is a big help and gives me confidence on testing my Ford Ranger 4.0
I got a P0171 code in my Chevrolet 5.7 LS1 V8 powered Holden Commodore last week but I didn't have a smoke machine to diagnose this,the O ring on the fuel filler cap had a split in it,it was only noticeable when the car sat for a few minutes then the engine was restarted at a service station for example - a fault code or codes would be set, previously,I also got a P0174 code as well.
So I checked the obvious things first,note the fuel tank wasn't holding vacuum,note Holden didn't fit a fuel tank pressure sensor so the P0442 code is irrelevant in my car.
I would consider making my own smoke machine but the obvious things such as the MAF sensor clamps coming loose have caused a P0102,P0171 & a P0174 code in the past !
quick thought here, it should hold pressure when powered and/or commanded on. Check the vent valve, may be stuck open and causing it NOT to hold pressure
The tank should be under a vacuum which it is,when I fitted the new fuel filler cap,I noticed a drop in idle speed for a few seconds then the idle speed stabilized at its normal idle speed so that tells me that the EVAP system is functioning correctly when the engine is running !
awesome video! helps me understand whats really goin on with my p0170 p0173 in my 3000gt
Great video I had the exact same prob, no brainer intake on 87% 01-03 old style gaskets thanks
Another note some might only open under pressure if it's a turbo vehicle boost leak testing as well as smoking should be done.
and yet another new toy I want but don't have the money for, lol. thanks
very good video thank you I'm going to try that on my LS7 with aftermarket lsxr 102 intake that must not be seeling well to the heads
1997 F-150 was getting po171, lean 1 bank, under the hood I found a pvc hose had came off, also clean MAF sensor with maf spray cleaner...cleared code at auto part store...lite never has came back since...
that system may take a couple "trips" for the monitor to recognize a real fault from a intermittent fault. Drive it for a few days and if it doesn't come back on, then it's most likely fixed.
realfixesrealfast Thank you very much..
your videos are the best,thank you.
Very nice, description and analysis.
great i wish i could one day be as good as you guys thanks for ur videos...
Great vid!👍🏼I hav po171 on my 2008 pont vibe and car has No symptoms - purrs. I’ve chkd maf sensor and intake valve gaskets. Gonna try and chk fuel pressure as everything else looks good. Also, it predominantly happens in cold weather - any suggestions??😣
Thx
Why is it that you didn't close off exhaust pipe ? My logic says the open valves would let smoke out the exhaust system ?
Very helpful video thanks
درود بر شما متشکرم اقا
Was the gasket leaking on both banks as DTC po171 & po174 reports?? Vid shows only one gasket / bank leaking smoke. If only one side, then why did both banks get reported?
with one bank running lean the system o2s and trys to rich the mixture causing an imbalance in the engine so if left long enough the computer will try to compensate for both banks it (the ecm tune) only being allowed to add so much extra fuel will set both DTCs also the intake can change as it heats up causing the other bank to lean out too as it expands
@TheSilverboy2011 CHECK FOR A LEAKING FUEL PRESSURE REGULATOR OR A GROUNDED FUEL INJECTOR CIRCUIT,,,,,
good idea to do those knock sensors while in there.
AMAZING MAN! Thank you for your information
Why not check the fuel trim? Most obd2 scanners will tell you pretty quickly if it’s a fuel delivery issue or a vacuum leak.
Very good 👌
Does this suggest if I'm only getting p0174 my issue is isolated to bank 2? Bad fuel pump or intake gasket would would throw both bank codes?
Well done!
Where can i buy one of these smokers?
Can you also do cooling systems with this?
Thanks
-Tim
great video! I have a 2002 vw jetta turbo, and took it to goodyear and they mention I need to replace a "Hose to Snorkel" what is that? they said i have to get it from the dealer. or were this part located at... the code coming up is P0171 Lean Bank 1
Does your smoke machine use shop air as the supply or does it require an external Nitrogen bottle?
I was watching a video and saw this post. Im not a certified mechanic or anything (just a guy thats owned and worked on a lot of different cars) but I'd think it was your water pump or possibly a stuck thermostat..Hopefully you've found the solution already, now that I seee this was a month ago
great video and very helpful..thanks
Will that make it throw codes on one bank and not the other? Im getting po300 code and crappy idle at cold starts also not functioning solenoid vent valve on my 03 Tahoe,oh also bank 1 sensor 1 low voltage and heat codes
I have a P0174 on my 02 Lexus RX300 . If it’s a low fuel pressure,it should be both banks,right ? When I drive,it runs very good. But at idle, it shakes a little bit. That indicates a vacuum leak,right ? Thanks
Great work...I just installed my knock sensors and intake gasket and now have a 171..im thinking..it's the gasket...
Me too. Let me know if it was the gasget
5:37 "So, all the evidence is LETTUCE to the problem." Hahaha.
hi, when u do smoke test, I assume some of the cylinder will be in intake or exhaust stroke even if we had first cylinder in TDC, this means i will always find smoke coming out in exhaust or in throttelbody , is my understanding correct. I know you have sealed breather house but have not exhaust side, can u please advise if i have misunderstood something
Great video!! Very helpful. Thanks!!
very informative. iv'e never even heard of smoke testing. thanks for the info
used a fogger smoke coming out of Idle air control valve changed it smoke still coming out but not as much is any smoke coming out normal?
Good one. TU
Why didn't you check fuel trims at idle and part throttle
Very informative video,thanks for sharing.Just curious,what would something like that cost with parts and labour?
check fuel injectors/ or vac leak on that side. False Air via leaking exhaust
Great video. Is it possible rent one of these machines?
Is it normal for the intake gasket to ware out like that or is it a symptom of some other part failing causing the engine to run hotter?
Man I wish I had a nickel for every time I saw one of those Gen III motors leak intake gaskets.
this is a job for Flex Seal. if it can seal a leaky boat on TV it can fix it all
AdirondackNY LOL! you are funny
Flex Seal does not work yes it is a hoax
sir,my respect to you,your videos are very helpful,i really enjoyed this,and learned something new every time i watch them,i have a mustang gt 99,do u have any videos recommendation?
When I do the smoke test on my 99 camry, smoke comes out of the EGR modulator filter. Is this normal? Should I seal it and keep looking? I've got P0171 , the car idles poorly, and I can hear a hissing noise.
I wish you had explained where else on the vehicle a problem could occur.
I have the the same to lean codes on my 01 Ford Explorer Sport, 4.0, 6cly. I now have had a few vacuum hoses that needed to be replaced, replace the pcv valve, replaced the fuel filter & I just spent quite a bit of money to replace my upper & lower intake gaskets. Still have the same 2 codes. I ordered a new MAF that will be arriving today. If that does not fix it, what else should I do or have done? I'm losing my mind here.
+mattymat1219 Try your pre cat O2 sensors
+lilchopin1 I changed all 3 of the O2 sensors
mattymat1219 could be fuel problem , check fuel trims
I have a 2001 2500hd 6.0 and the engine shutters only when I hit a bump, and P0174 comes up on my programmer. what would be the cause in this case? I tried shaking wires under the hood and under the truck while running but didn't shake anything that made the engine miss. any ideas?
My 2000 5.3 Silverado has only code po171. Could it still be intake gasket leaking on one side?
Scotty says we can do this with a cigar
Scotty doesn't know his ass from a hole in the ground.
Quiet Wyatt 😂😂
Quiet Wyatt i wonder if scotty takes two minutes fuc$&ing like he does on his videos. Lol
I am getting only the P0171 system too lean bank 1....why would only one side trip but not both?
can oxygen sensors triger this codes.. i have 07 avalanche new body style.. check intake leaks and replaced maf sensor.. fuel pressure is at 60.. also good .. now im down to think its oxygen sensors.... any help?
Thanks for another great video!
Great video!
awesome video, thanks for the tips
how much does that service costs? My 2002 silverado 1500 has the same codes problem PO171 AND PO174.
Do this method works for an 08 Tahoe
How much did that process cost in terms of parts and labor?
Why would it have both 171 and 174 codes for both banks if leaking from only 1 side?
Really good vid.
many thanks very helpfull to me
Hi I came across your vid today and I was wondering if you could answer a quick question?
I have a 2001 Ford F-150, i did a smoke test because of a lean code I am getting. The only place the smoke came out was from a little round vent cap on the IAC valve. Is that little vent cap supposed to leak smoke? I remember doing a smoke test on my truck a few years back for a pcv valve hose leak and I don’t remember that cap ever leaking before. The only reason I’m questioning this is because I saw a couple posts online about this and I saw some people had said that vent cap will leak smoke during a smoke test. But again, when I did this test a few years back I think I would’ve noticed it.
Thank you much appreciated
the IAC valve should not leak smoke
realfixesrealfast
Okay thank you so much for the response. Lol all day at work I kept going back and forth in my head if it should or not. Thank you again
I replaced the IAC valve on Friday night. That leaking vent where smoke cane out is was what was causing the vacuum leak.
Thanks again for your input.
Awesome video thank you!
Nice video
i cant imagine y the intake would smash like that unless put on wrong or bad product
Is it normal to get some smoke from an EGR Valve Body?? Mine has slots cut out in the body of the EGR Valve and some smoke comes out of those slots.
remember, EGR is exhaust gas recirculation, so that smoke must be in the exhaust gas. That is not normal and should be checked
hi, can you pliz help i have my c230 v6 2007 and it runs so smooth but it is showing the check engine light and i checked it and it gave me this code. i cleared the error but it comes out after a 5 to 10 kilometers of drive
Self-adaptation of mixture formation for enrichment at partial load for the left cylinder
bank is above the permissible limit. (P0174)
Self-adaptation of mixture formation for enrichment at partial load for the right cylinder
bank is above the permissible limit. (P0171
super helpful. Thanks so much!
God what did this cost
You put the wrong gaskets on the car. GM had a TSB on this. The updated gaskets are teal in color. Your customer will have this issue again if they keep the car long enough.
nice videos
Hello, I have 2.0 96 contour. Had it smoke tested and smoke came out egr valve vent holes. Guy didn't block off intake or exhaust just put snapon smoke machine onto valve cover. Is the smoke leaking from those vent holes normal because it may have a positive pressure egr? He said not supposed to leak another shop said same, but I've read it may be normal on some cars. Please reply because I'd greatly appreciate it because I'm getting contradictory information. Thanks
tpformybunghole1974 I'd like to know the answer to this as well
+Arturo Torres Hi there, i am looking for the same answer just like you , did you find it , please share it. Thanks
+Dal Mark Yeah, it is normal. I replaced it with a brand new Motorcraft EGR valve and it did the same.
Thank you so so much...On mine , the smoke is coming through those wholes .I was doubting on it , so I will see it as normal then. Thanks again.
LOL, I guess incense wouldn't work? Great vid!
Also getting a O2 sensor code
WHERE IS YOU SHOP LOCATED?
hey can u help me with this i have at malibu 97 and my low radiator hose is empty
I got two trucks with the same problem. Its a s10 with 4.3 and a Van with 5.7. I changed MAF sensors on both trucks. S10 ran alot better after that and van is the same. Also both exhaust manifolds on both trucks turn CHERRY RED after running it. S10 gives a codes P0171 and P0147 ocassionally. I would greatly appreciate any help. Thanks alot
Hi , my name is Dan .I have the same codes coming up I put a new air flow sensor and it gives me the same codes I looked for leaks but did not find any could it be the 02 sensors are bad? Thank you dan ,it's a chevy silverado 2000
Daniel Cortes you may need to reprogram/update your pcm with the latest software, ive fixed a few of the like that after veryfying that nothing else is wrong
how much for something like that cost?