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In this video I have a look at a customers GMC Envoy XL with the big 4.2 that came in with a complaint of, "MIL on and hard to start after it is warmed up."
A quick test drive leads us right to the answer. It's looking like a fuel delivery issue but we need to drop the tank and run a few more checks.
-Enjoy!
Part II: https://youtu.be/4fNaL0gI1Yk
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99 thoughts on “Gmc envoy: hard start when hot low fuel pressure – part i”
  1. Avataaar/Circle Created with python_avatars nello michi says:

    wadda ya drinkin ? booze ? lol lol bwaaaaahahahaaaaa

  2. Avataaar/Circle Created with python_avatars Scott Kaercher says:

    If you live in new york your gonna have a mouse nest in your motor lol. I lived in niagara falls for 15yrs and olean for 2 years and once a month i was clearing out a mouse nest and in the winter its 2 or 3 nests lol. Little bastards reak havoc on your wires lol.

  3. Avataaar/Circle Created with python_avatars Henry Ioerger says:

    just finished a 03 3/4 ton gm 6.0 with a partial plugged fuel filter fuel pressure test was ok (60) ,fuel trims long trim -3 and was getting 6.5mpg. low power and lack of performance. Replaced partial plugged fuel filter and power came back ,mpg back to 11 Took me awhile to think it through

  4. Avataaar/Circle Created with python_avatars Almokashfi Mohammed says:

    Good jobs

  5. Avataaar/Circle Created with python_avatars Antonio Claudio Michael says:

    Customers that are willing to buy oem parts and Open to just fix it are the best customers to have they let you be the tech and explain in order to find the problem I will have to potentially tear this apart do it is what they say are the best customers the want you to diagnose and fix there problem not question you every 5 seconds and it's nice good Video Eric O @SouthMainAutoRepairLLC

  6. Avataaar/Circle Created with python_avatars John Bragg says:

    What happened to……Josh?

  7. Avataaar/Circle Created with python_avatars oracle wisdom says:

    if the customer is too broke or cheap to fix the wheel bearings, he likely didnt hire a professional shop to try and fix his fuel sending unit,.,. he may have been monkeying with it himself, or hired some ass clown to do it for a case of beer.. when u have to drag information out, and they have no reciepts from the "other" shop, no interest in getting warranty on parts supposedly already installed. or for labor charged that was misdiagnosed. , they are likely blowing smoke up your arse..

  8. Avataaar/Circle Created with python_avatars irgski says:

    “Don’t be weird”….and that folks is why guys need to get married!

  9. Avataaar/Circle Created with python_avatars Kevin G says:

    e 85 vehicle ? If aomeone had that plenum bx off …theres a breather hose on the underside ….that doesnt get reattached

  10. Avataaar/Circle Created with python_avatars Kenneth Freeman says:

    I'll be waiting for Part 2 Of the Perils of Pralines

  11. Avataaar/Circle Created with python_avatars oracle wisdom says:

    theres probably a pinhole in the rubber tubing that goes from the fuel pump to the assembly inside the tank.. also the rubber hose in there can swell and come partially loose. OR maybe they put the wrong fuel pump in . I know the older chevys run around 9 to 12 psi. maybe you can try dead heading the fuel pump and see if the pressure will build.
    trying to get the truth out of people is like pulling teeth.,,. sometimes your better off just staying focused on your troubleshooting procedure and just follow it to the culprit.

  12. Avataaar/Circle Created with python_avatars geerhead1984 says:

    Hey Eric. How you like that thinkdiag scantool? I have the thinkdiag fully bidirectional dongle style scanner they sell and use it everyday at work. Amazed at what It can do for the price point. Thought about investing in one of their units like your using here. Just wondering your thoughts of it

  13. Avataaar/Circle Created with python_avatars michael blacktree says:

    Hey Eric, don't be weird. 😛

  14. Avataaar/Circle Created with python_avatars Matt Man Productions says:

    It wouldn't be a video of it didn't have a mouse nest😂

  15. Avataaar/Circle Created with python_avatars Raul Pereyra says:

    You're using a ThinkTool. That's pretty cool. Why the new scantool?

  16. Avataaar/Circle Created with python_avatars Fjord Driver says:

    So Mrs O is thinking perhaps she will walk out and you and the new guy will be naked, looking into an engine bay discussing fuel pressure. It's okay, lots of women married to mechanics have crazy thoughts like that, according to Modern Mechanic trade journal.

  17. Avataaar/Circle Created with python_avatars sandra folsom says:

    Chevy Thunder!

  18. Avataaar/Circle Created with python_avatars Marty B says:

    ok one question what scanner were you using today and why? ok two questions? lol

  19. Avataaar/Circle Created with python_avatars David Durham says:

    For us dummies, what’s OEM data again?

  20. Avataaar/Circle Created with python_avatars Alexander Martin Causey says:

    Those things are slow, but I'm counting roughly 14 seconds from a near stop to 60ish with your foot glued to the floor. Shouldn't be THAT slow. But hey… at least it's getting better fuel economy.

  21. Avataaar/Circle Created with python_avatars David 1167 says:

    Now that is covering you're bases.

  22. Avataaar/Circle Created with python_avatars jo300hn says:

    Looks like we got ourselves an Envoy.

  23. Avataaar/Circle Created with python_avatars A Smithh says:

    Don't be normal!

  24. Avataaar/Circle Created with python_avatars jsj297 says:

    Did you say “meeer?” Boy? 😹😹

  25. Avataaar/Circle Created with python_avatars arthur dasilva says:

    Does the wife have a Massachusetts plate on the wall?

  26. Avataaar/Circle Created with python_avatars Jack Jack says:

    Does Napa pay you to have that big sign on your building? Not a sponsor

  27. Avataaar/Circle Created with python_avatars Patrick Cayton says:

    That's the way it always happens. Fuel pump goes out with a full tank. Did it twice with my own truck. Wasn't fun on the ground with a floor jack.

  28. Avataaar/Circle Created with python_avatars Mike Merrill says:

    Wow I can hear those wheel bearings on your test drive. Man those are bad!

  29. Avataaar/Circle Created with python_avatars Patrick Cayton says:

    Phil needs to introduce himself in his boxers and clear the field for some quality videos.

  30. Avataaar/Circle Created with python_avatars Latarian HoodRat says:

    Stay weird, Eric, stay weird.

  31. Avataaar/Circle Created with python_avatars watajob says:

    Mrs. O's deadpan delivery on the locker room was perfect!🤣🤣🤣

  32. Avataaar/Circle Created with python_avatars Mellow Guy says:

    I don't think I ever had a dead fuel pump show up that didn't have a full tank of gas on it.

  33. Avataaar/Circle Created with python_avatars Thomas Fletcher says:

    GMC = Gotta Mechanic Coming

  34. Avataaar/Circle Created with python_avatars William T. Musil says:

    Hiya Eric

  35. Avataaar/Circle Created with python_avatars Lawrence Pevitts says:

    I love it when you taking a vehicle for a test ride. I enjoy the scenery in and around your beautiful little town.

  36. Avataaar/Circle Created with python_avatars Jeremy Proctor says:

    i wonder if while the fuel level sensor was being fiddled with if they broke the plastic on the pump or cracked the lines?

  37. Avataaar/Circle Created with python_avatars thomas savage says:

    I use Lucas fuel clean… haven't had fuel problems for 10 years. A little in every fill up motorcycle & car.

  38. Avataaar/Circle Created with python_avatars Clinton Lewis says:

    How do you guys like that Thinktool scanner?

  39. Avataaar/Circle Created with python_avatars Benjamin Stockton says:

    Awesome Eric O. Appreciate the videos buddy 👍

  40. Avataaar/Circle Created with python_avatars Iain Kinsella says:

    Shoot it with an Atlas

  41. Avataaar/Circle Created with python_avatars Justa Pro says:

    I'm going to buying a new/newer diagnostic unit, and I'd like to know which model of Snap-on you are using here, please.

  42. Avataaar/Circle Created with python_avatars Bowhunters says:

    Shouldn't the Fuel Pump be putting out 50-60 psi ?

  43. Avataaar/Circle Created with python_avatars dewey cheatem says:

    Funny I use cake pans in my shop too.

  44. Avataaar/Circle Created with python_avatars The Asthmatic Jedi says:

    I’d love to see the video on the pump replacement. I’ve got one of those and would love to see how you do it.

  45. Avataaar/Circle Created with python_avatars Kevin Barry says:

    Never fails; need a fuel pump; fuel tank is full