In this video I have a look at a 2008 Chevrolet Silverado 1500 5.3 that came in with codes P0171 and P0174 indicating that the engine is running lean. It doesn't take to long to find the problem and come up with a temporary fix.
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49 thoughts on “Chevy / gmc truck – running lean p0171 p0174”
  1. Avataaar/Circle Created with python_avatars The Truck Farmer says:

    Thanks Eric! I’ve got a 2002 6.0 with lean codes that brought me to this vid. It came with a “ Kendra and Natalie” junk intake when I bought it. Will use your approach to help diagnose my issue.

  2. Avataaar/Circle Created with python_avatars Cole Knight says:

    Wouldn’t it be a bad idea to remove air after the maf?
    If that little hose pulls then it’d cause problems if maf says “x amount of air”
    Then you remove some and then it goes past the throttle body

  3. Avataaar/Circle Created with python_avatars joseph bourdeau says:

    I got an 06' flex fuel Suburban and I got both of these codes immediately after filling my tank with E-85 . I erased the codes and they came back several times . I concluded the gas probably had water contamination . I ran the tank almost empty put in a bottle of fuel system cleaner and filled up with regular gas and the problem went away .

  4. Avataaar/Circle Created with python_avatars c.a jones says:

    excellent as always …
    I wish we was closer to your shop

  5. Avataaar/Circle Created with python_avatars Kevin Wright says:

    My hose went to the throttle body

  6. Avataaar/Circle Created with python_avatars Atlas Fuel Oil Inc. says:

    I like your explanations, very clear and well thought out even on the fly

  7. Avataaar/Circle Created with python_avatars Atlas Fuel Oil Inc. says:

    Jb weld is perfect to have around, they also make quick weld for short time.

  8. Avataaar/Circle Created with python_avatars Jim Gordon says:

    That smoke generator is PRICEY. Way too much for a DIY home mechanic. Bummer.

  9. Avataaar/Circle Created with python_avatars Jim Gordon says:

    Scanners lack one thing that would be very helpful. Showering what the reading is is only half the picture. They should also show what the reading should be at optimum.

  10. Avataaar/Circle Created with python_avatars Milli Millz says:

    My evap monitor and 02s monitor is not responding what should I do because I keep failing emissions

  11. Avataaar/Circle Created with python_avatars Nicholas Padeletti says:

    I have been a.backyard mechanic for years. I have been trying my best to learn about the newer vehicles. I can say your are a very good teacher and mechanic. Thank so much for these videos. I have learned so much.

  12. Avataaar/Circle Created with python_avatars John Nelson says:

    I love the snake oil air intake sales pitch…. Instant extra power, just give us $100 and we’ll give you some plastic crap that makes you feel like your truck is magically faster

  13. Avataaar/Circle Created with python_avatars Ka Ru says:

    I clean my maf sensor and change a8r filter turn off light..but a Montt later is on again…same codes p0171 p0174…any advise? Liled n suscribed gmc 2000 sierra

  14. Avataaar/Circle Created with python_avatars Mr D says:

    Mr Eric O., I'm in my 60s and wish I had someone like you near me to repair my vehicles. I enjoy your channel very much thanks for sharing all your knowledge. you're a class act.

  15. Avataaar/Circle Created with python_avatars Z Speed Mobile Mechanic says:

    Awesome work!😃

  16. Avataaar/Circle Created with python_avatars Thom Martin says:

    I have a similar problem with a 2001 chevy, 5.3 that my ltft is around 20 all the time. Truck runs great, problem is there is no reading from the tps at all. Could this cause this problem?

  17. Avataaar/Circle Created with python_avatars Brandon McCullough says:

    I would have clamped a mini K&N cone filter directly to the port…no modification to intake.

  18. Avataaar/Circle Created with python_avatars paul kaufman says:

    Thank you for the teaching component! I have been watching trims but never thought about Erving to identify vacuum as the issue. I love your videos!

  19. Avataaar/Circle Created with python_avatars Aaron Stromer says:

    hopefully someone can help me here… I have a 2000 GMC Sierra 2500 6.0 with these same p0171 p0174 codes. I've run smoke test multiple times and found nothing. replaced intake manifold gaskets, fuel pump, filter, injectors, regulator, pcv valve…. Have found no vacuum leaks at all. Some one help!!!

  20. Avataaar/Circle Created with python_avatars elijah willis says:

    Love the knowledge you share in your videos.

  21. Avataaar/Circle Created with python_avatars Jeremy Adams says:

    I am no mechanic, but enjoy learning and doing my own repairs on my '08. I have almost the identical problem with mine. And a huge thanks to your explanation of what all was happening with the lean fuel trim code, I know mine is a vacuum leak as well. Thanks so much!!

  22. Avataaar/Circle Created with python_avatars Skinny 717 says:

    What for scan tool are you using I been wanting to get one just not sure if I want to go with Matco brand or snap on

  23. Avataaar/Circle Created with python_avatars Shawn Dinterman says:

    My autel maxipro was $600 that Bosch is $5k as of 12/2021 what more could that thing do to justify a $5k price tag?

  24. Avataaar/Circle Created with python_avatars Samuel Marinov says:

    "Welcome back to the Self-Made Auto channel"

  25. Avataaar/Circle Created with python_avatars MB says:

    I love that we live in a world where this info is free and you can make a good living giving it to us, I learn so much

  26. Avataaar/Circle Created with python_avatars Ian says:

    In tech school right now, and I just wanted to say thank you for this video! It has helped me!

  27. Avataaar/Circle Created with python_avatars Jason Lurf says:

    It looks like that GreenFiltersUSA intake hose is meant for racing application only. K&N intake housings come with the hole and maybe a tube. Or maybe that Green intake is the wrong part for that vehicle. Still, it looks like he found the problem.

  28. Avataaar/Circle Created with python_avatars Pablo Suarez says:

    You are funny Eric! I love the the line “The MONEY LIGHT is on.” Not too many would appreciate it, I think it’s absolutely hilarious!
    You are not wrong. You’re videos are informative but as I hope everyone realizes that every situation is different by design. Geography, driving conditions, drivers mood at the time driving the vehicle at all times, and the the DIYers ability to use your tools.
    It’s obvious that your knowledge comes from years of experience, however the tools is something you’ve built up over all those years. Technology has changed the combustion motor as I knew it growing up born in 1966. Most of the videos I have seen from SMA utilizes all of these great tools you have to diagnose, which almost always winds up not being something I can diagnose myself. I’d like to have your tools but that is not happening in my lifetime. I am forced to to take it to someone with the tools you may or may not use, but one thing is for sure. I go in with knowledge that I didn’t have before watching you do what you do so very well. Whether or not it helps me when dealing with a professional wrench turner or in fact makes it worse because I’m suggesting things to him that he really doesn’t want to hear. I don’t know for sure, but I do know that I’m not paying for parts and labor on stuff that I know the vehicle did not need. The mechanic who just throws parts at a vehicle to see if it fixes the problem should have his ability to do repairs on vehicles for money revoked permanently. Geography plays a role for the obvious reasons. With you in New York and me in Southern California, the stuff you spend time on like removing almost all under carriage components that are rust engulfed, takes me no time at all because that’s not an issue here in my region.
    Driver mood is important because you either have a car that was driven all its life by a little old lady who went to doctors appoints and bingo less than 7miles from her home and never going over 40mph, or a younger to middle age person who has to be in lead foot mode all the time who has driven all over hell and back. If I’m buying a used car I prefer the former rather than the latter.
    I’m enjoying your videos and it is informative whether I do the repairs or not.
    Thanks, it’s much appreciated!

  29. Avataaar/Circle Created with python_avatars Hola! drmikeosgood says:

    Hello; unless one has a 1200 dollar interface computer to access the engine and the learned training, It makes somewhat confusing for most of use who hate to get a trucking for the average dealer. Nice to see your back to explain the process and how it was reached. Thank Eric !!

  30. Avataaar/Circle Created with python_avatars Michael Berry says:

    The JB Weld will be around long after the rest of the truck has corroded away

  31. Avataaar/Circle Created with python_avatars The Car Doctor says:

    Hate those aftermarket “performance” intake systems. We remove them all the time.

  32. Avataaar/Circle Created with python_avatars Malcolm galton says:

    What about minus 100 to plus 100 but I still have power but minus 100 at idle. Never seen anything like this before

  33. Avataaar/Circle Created with python_avatars Billy Jamison says:

    Thank you

  34. Avataaar/Circle Created with python_avatars Ao1968 says:

    Aftermarket intakes are great, for high rpm engines. they are not so great for street cars that spend 99.99999 of their time at idle with ac on.

  35. Avataaar/Circle Created with python_avatars edgar pettijohn says:

    I had the same issue on a 2000 blazer. Seemed like a vacuum leak due to fuel trim analysis. It was also burning gas like crazy. It ended up being some goober changed the timing chain and put the camshaft upside down. What's weird is how well it ran. Except at idle it acted like it had a major vacuum leak.

  36. Avataaar/Circle Created with python_avatars Tom Mack says:

    its to bad you are not around my area , i would make you my go to mechanic !!!!!

  37. Avataaar/Circle Created with python_avatars Tom Mack says:

    i have a 2005 chevy Silverado 1500 4×4 and i have the same codes after i replace the right front break line , this video helped a lot , i am disabled so i am short on cash

  38. Avataaar/Circle Created with python_avatars tony castro says:

    HAHHAHAHAAHAL,,,,,IM LEARNING,,,BUT SHT CANT STOP LAUGHING AT THE SAME TIME,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

  39. Avataaar/Circle Created with python_avatars B Souza says:

    FANCY!

  40. Avataaar/Circle Created with python_avatars charles chaboya says:

    Honestly its like I see myself talking and working through it. Super cool Tech of course i like the way you wrench. I'm new to the channel so thanks for the vid.

  41. Avataaar/Circle Created with python_avatars Daniel Geng says:

    I learn more here than I did at Lincoln Tech … cheaper too !

  42. Avataaar/Circle Created with python_avatars Steve Perrett says:

    Just the same problem as I have, making a smoke machine, great video

  43. Avataaar/Circle Created with python_avatars NONY says:

    I’ve gotten them gots on my 02 GMC Yukon But only when my ac is running just trying to figure that out rrr one thing or another with this car

  44. Avataaar/Circle Created with python_avatars Mark Steele says:

    It's a good thing you're around for people who don't drive Toyota's.

  45. Avataaar/Circle Created with python_avatars Peter Sallander says:

    The owner works at a dealership and could not find it? Glad you who he was but then again I'm in Wisconsin.
    Nice job
    I agree about after market products are none be trash or hard to install and it work right.

  46. Avataaar/Circle Created with python_avatars MacGyver 2 says:

    Explained problem @ possible fixes well. Thanks

  47. Avataaar/Circle Created with python_avatars dereksdiatribe says:

    soldering iron.

  48. Avataaar/Circle Created with python_avatars Long Qu says:

    great job and thanks so much. I learned something.