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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Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained.

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:

    โ€œDonโ€™t be weirdโ€โ€ฆ.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. ๐Ÿ˜›

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

    It wouldn't be a video of it didn't have a mouse nest๐Ÿ˜‚

  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, whatโ€™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 โ€œmeeer?โ€ Boy? ๐Ÿ˜น๐Ÿ˜น

  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!๐Ÿคฃ๐Ÿคฃ๐Ÿคฃ

  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 ๐Ÿ‘

  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:

    Iโ€™d love to see the video on the pump replacement. Iโ€™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

  46. Avataaar/Circle Created with python_avatars jim armentrout says:

    Donโ€™t forget the wheel bearingโ€™s

  47. Avataaar/Circle Created with python_avatars Vintage R/C says:

    Love your channel! Love
    The way you troubleshoot and
    Simplify electrical issues!
    Could the fuel injectorโ€™s
    Be suspect? Please keep
    The great videos coming.

  48. Avataaar/Circle Created with python_avatars J M says:

    โ€œTemperatures are just right outside ๐Ÿ˜Žโ€, โ€œimmediately starts revving engineโ€
    Thatโ€™s my guy right there

  49. Avataaar/Circle Created with python_avatars Bill Ziegmond says:

    Why is it anytime it's a fuel pump problem. They just filled the tank up.

  50. Avataaar/Circle Created with python_avatars Jay Baker says:

    Again a very good video

  51. Avataaar/Circle Created with python_avatars Chris Vargas says:

    I need closure!

  52. Avataaar/Circle Created with python_avatars BIG GUY SIMPLE PRODUCTIONS says:

    Seeing the boss lady in your videos ads the icing on the cake of a sweet video already I just sit in amazement at all your tools….. Thanks for another great video Mr o

  53. Avataaar/Circle Created with python_avatars fern3056 says:

    I want to see the follow upโ€ฆ I need closureโ€ฆ thanks Eric I always learn something from your videosโ€ฆ..

  54. Avataaar/Circle Created with python_avatars New Jersey Bill says:

    You don't need to run further tests, "It's filled to the tippy top" means absolutely the pump is bad. They NEVER fail when the tank is conveniently almost empty.

  55. Avataaar/Circle Created with python_avatars hahaha12345678993 says:

    what's up with NY cars and their complimentary mice nest per car and bad wheel bearings on every car

  56. Avataaar/Circle Created with python_avatars mazzg1966 says:

    It's weird how much I thoroughly enjoyed this video! Ha ha ha …new guy thinks you are talking to yourself…oh and by the way we are watching too…ha ha ha thanks Eric & Mrs. O that was fun!

  57. Avataaar/Circle Created with python_avatars Ryan S says:

    Iโ€™m surprised that engines running with 20psi

  58. Avataaar/Circle Created with python_avatars Terry Doberstein says:

    Plugged converter my guess. Best keep an Eye on those or you will need to change your exhaust manifold. Also can cause issues with A/C, until new cat was put on.

  59. Avataaar/Circle Created with python_avatars maykevin5 says:

    Maybe the rubber hose that the motor connects to the lid leaking in the tank bleeding pressure?

  60. Avataaar/Circle Created with python_avatars Rockcycle Studio says:

    great video Eric…if i was Phil i would be honored to be a part of the SMA team. Never let your life's path be sidetracked by a stone in the road …you're doing what you were meant to do. And you do it so well …like i said i am sure Phil is honored to be in a shop that stands tall on the Web .

  61. Avataaar/Circle Created with python_avatars Spike Protien says:

    Those brownies will taste like gas now.

  62. Avataaar/Circle Created with python_avatars David Bronicki says:

    I'm tired of seeing scan tools I want to see more mechanical work

  63. Avataaar/Circle Created with python_avatars James Evensen says:

    Thank you Misses O. That was good

  64. Avataaar/Circle Created with python_avatars matufias1 says:

    Smart move Mr. O on rolling down the window.. I used to valet cars on a ski resort and got myself locked out twice on one of those, good thing the resort had AAA

  65. Avataaar/Circle Created with python_avatars V M says:

    I don't quite understand fuel trims, so every time you make a video with fuel trim data I'm particularly interested……….also, what did you hear/feel to instantly know that the wheel bearings were bad?……Thanks for another great video.

  66. Avataaar/Circle Created with python_avatars Jelly Bean Driver says:

    That first full throttle snap sounded very interesting. Never heard a 4.2 L6 sound quite like that. Nevermind the sawmill wheel bearing. Lol

  67. Avataaar/Circle Created with python_avatars Brian Skitch says:

    Beautiful looking PRNY cornfields!

  68. Avataaar/Circle Created with python_avatars Bigtruck57 H, says:

    Damn….. You beat out Rainman today. Ray is MIA. This customer has obviously gone full Amazon Chineesium on this fuel pump, and has finally brought it to somebody who knows what they're doing. Greetings from Lake City ๐Ÿ˜Ž๐ŸŒด๐Ÿ‡บ๐Ÿ‡ธ

  69. Avataaar/Circle Created with python_avatars Paul1958R says:

    Eric,
    Great video and diagnosis/explanation – thank you! You are amazing. I'll say it again: if you had worked for NASA in 1970 Jim Lovell would have been the fifth man to walk on the moon…and be a totally obscure figure today. ๐Ÿ˜‰
    SMA#1
    Paul (in MA)

  70. Avataaar/Circle Created with python_avatars delcorick99 says:

    That's what I was suspecting is the fuel pump based on the way it started/long crank and you indicated the o2 still read lean under full throttle, also you tested thru your scan tool the fuel tank psi, I've done wheel bearings on these GMC envoy 4.2 and Trailbalzers and even though it's a straight 4ward job those hub bearings are in their tight, tighter than most others I've found, Nice Video!

  71. Avataaar/Circle Created with python_avatars BraaapAttack says:

    Fix for the wheel bearingsโ€ฆ. Just turn the radio volume knob to the right, many turns to the right ๐Ÿ˜ณ

  72. Avataaar/Circle Created with python_avatars WD Hewson says:

    Good stuff.

  73. Avataaar/Circle Created with python_avatars Flight Forensics says:

    Man! Beautiful part of the country you live and work! AND A DOLLAR GENERAL?!? Far out!

  74. Avataaar/Circle Created with python_avatars Advanced Level Diagnostics says:

    Thanks Great video! You can look at the amperage spike when the pump turns on to give you an idea if the power and ground is good. If it spikes to around 20 amps you know it can carry a decent load.

  75. Avataaar/Circle Created with python_avatars Michael Stagar says:

    Answer: It was the Tooth Fairy Mechanic that came in the middle of the night, without the owner permission.

  76. Avataaar/Circle Created with python_avatars wazza33racer says:

    for a vehicle that age, its about time for a new pump……..they usually dont last much longer.

  77. Avataaar/Circle Created with python_avatars Firechickens says:

    What scanner is that?

  78. Avataaar/Circle Created with python_avatars Graeme says:

    I thought Mrs O had come to retrieve her baking tray.

  79. Avataaar/Circle Created with python_avatars Bradley Barnette says:

    Lol can hear the bearings on cameraโ€ฆ..I live when the customer says โ€œI donโ€™t hear the noise you are talking aboutโ€ or my personal favorite of all time โ€œI donโ€™t pay attention to anything while Iโ€™m drivingโ€ ๐Ÿคฃ๐Ÿคฃ๐Ÿคฏ๐Ÿคฏ๐Ÿค”๐Ÿค”

  80. Avataaar/Circle Created with python_avatars Jon Ronhaar says:

    Wouldn't your scan tool show you the fuel pressure without having to attach the fuel pressure gage?

  81. Avataaar/Circle Created with python_avatars Shane Anderson says:

    Another top tip segment on how codes are never straight forward .. love this channel . Australia

  82. Avataaar/Circle Created with python_avatars steven reynolds says:

    I had an envoy that after idling for a few minutes, it would shut off like you turned the key off, almost like it was on a idle timer. It would start right back up and always ran great otherwise. BTW, there is a fuel pressure port underneath by the filter.

  83. Avataaar/Circle Created with python_avatars Campbell's Soup Kitchen says:

    Vehicle needs a detail.

  84. Avataaar/Circle Created with python_avatars ChillCosmos says:

    Thankfully wheel bearings are easy to replace on these. Literally 15 minutes each side

  85. Avataaar/Circle Created with python_avatars Justin Lynch says:

    Couldn't you run wires directly to the fuel pump as a check?

  86. Avataaar/Circle Created with python_avatars Shane Anderson says:

    Phil Phil whoโ€™s Phil ?
    Punxatomi Phil ?

  87. Avataaar/Circle Created with python_avatars Terry Pickette says:

    – ๐Ÿ‘ ๐Ÿ‘ ๐Ÿ”ง – ๐Ÿ‘€ โค๐Ÿค๐Ÿ’™

  88. Avataaar/Circle Created with python_avatars Honey Bear says:

    I always look forward to the cameo appearances by Mrs. O.

  89. Avataaar/Circle Created with python_avatars Thomas Czyz says:

    I had a similar situation on my 1998 chevy pickupโ€ฆthe ground strap from starter to frame was rotted ..big time power drop to the fuel pump and tail lightsโ€ฆ

  90. Avataaar/Circle Created with python_avatars Grumpy_ShihTzu says:

    God damn, the door chime is loud as fuck. GM must hate it's customers.

  91. Avataaar/Circle Created with python_avatars macklandtube says:

    Everything I got right here! I've got a 2002 trailblazer with 330,000 on it. These engines are beasts. No oil burning or leaks. Still getting 18 mpg. Change oil every 5,000 and use Lucas fuel treatment consistently. Live in rust belt and frame cracked from rust. I'm gonna weld it up and keep driving.

  92. Avataaar/Circle Created with python_avatars Bob Berndt says:

    No worries. Weird is the new normal. ๐Ÿค”

  93. Avataaar/Circle Created with python_avatars B Wakeford says:

    Mrs โ€œOโ€โ€ฆโ€ฆ โ€œDonโ€™t be weird!โ€ Great advise to receive from your wife. ๐Ÿ˜† lol

  94. Avataaar/Circle Created with python_avatars ThatGuy says:

    Boy, was she pissed you stole her cake pan…again! ๐Ÿ˜„

  95. Avataaar/Circle Created with python_avatars James Halsell says:

    Man! those wheel bearings are so bad I thought you had it in low gear for a second there!

  96. Avataaar/Circle Created with python_avatars Willie Delgado says:

    Whenever you have to drop a tank, it's always full! SMH

  97. Avataaar/Circle Created with python_avatars daveyio87 says:

    Thanks for teaching me 2 things in this video! About the o2 sensor should peg to about 1000mv during wot and that being that it went to 0 it was a fuel delivery problem. And the other thing was about an amp per 10psi for the fuel pump. You are one of the reasons why i continute to learn in this career. I may be 100% trained by GM but i still have a lot to learn!

  98. Avataaar/Circle Created with python_avatars Reese says:

    Mrs O wants her pan back.

  99. Avataaar/Circle Created with python_avatars Will W says:

    I used to do a lot of fuel pumps with full tanks. I used to use a lift and a transmission jack under the tank. Funny thing is the companies I worked for never ever had any of us pull a transmission, but those had really expensive ($1,400 to $2,000) high transmission jacks for use with vehicle lifts. The only full tanks that were hard were the 40 gal strange conformal designed tanks, which were really long for pick-up trucks or cargo vans.

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