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chevy 6.0 stalls out at low idle

Discussion in 'Truck & Equipment Repair' started by dbduts, Nov 21, 2009.

  1. dbduts

    dbduts Member
    Messages: 59

    I have achevy 2500hd that use to idle at about450 -500 rpm and would stall sometimes now after I tuned it up plugs and wires it stalls worse runs strong no missing can't cross wires Was told possible throttle body unit goes and causes low rpm.Anyone else deal with this before
    Thanks Dan
  2. no lead

    no lead PlowSite.com Addict
    Messages: 1,308

    start it up an slowly run a can of carb cleaner through it.
  3. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Yes and no lead has you on the right track for starters except to do it properly and completely you need to remove the throttle body to do a thorough job. A can of TB cleaner and a soft bristle brush is your friend.
  4. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Also, make sure there are no air leaks between the throttle body and the mass air flow sensor. A poor idle sometimes happens after working under the hood as guys have a tendency to lean on the air intake piping pushing it down slightly. Which causes air to leak in around the clamps. Don't overlook that detail.
  5. 09dieselguy

    09dieselguy Senior Member
    Messages: 283

    does the air conditiong on by some chance. can you hear the pump running?
  6. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Cleaning the MAF is a good idea too. What are you running for an air filter? What did you put in for plugs, and what is the gap?
  7. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    When mine did something similar to that, stalled or ran at very, very low rpms on idle, it turned out to be a weak fuel pump/fuel pressure regulator. Never had an issue since.
  8. buckwheat_la

    buckwheat_la 2000 Club Member
    Messages: 2,254

    i have a truck that did that, we just did a tune up on it, and it isn't doing it anymore. We did wires, plugs, air filter, fuel filter. i suspect the fuel filter first, that was really plugged on my truck.
  9. ChevKid03

    ChevKid03 Senior Member
    Messages: 505

    I had a 6.0 do the same thing. Ended up being the intake tube came loose by the intake manifold. Make sure it's seated properly.
  10. dbduts

    dbduts Member
    Messages: 59

    Thanks guys i will check all of those things before I buy throttle body .
  11. snow7899

    snow7899 Senior Member
    Messages: 234

    No, don't buy a new throttle body. The housing just needs to be clened. Just take off the intake air tube, remove the three 10mm nuts, disconnnect the electrical connector, then disconnect the coolant lines. Then get a good can of spray carb cleaner and a soft brush like B&B said. Open the trottle with your finger and clean where the valve sits in the rest position. Good luck.
  12. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Last edited: Nov 22, 2009
  13. dbduts

    dbduts Member
    Messages: 59

    Thanks again guys this info is awesome.I was a mechanic 20 years ago and only worked on my own trucks not up on latest problems and remidies.I am so glad I found this site .Everybody is a ok .
  14. purplehavoc

    purplehavoc Member
    Messages: 97

    As mentioned,sounds like a possible fuel pump.
    As for cleaning the intake and fuel system,grab a can of Seafoam if you can find it.
    That stuff works wonders.
  15. dbduts

    dbduts Member
    Messages: 59

    I bought the cleaning stuff today going to try to get to it tomorrow.
  16. Does the tranny have a lock-up torqconverter on it. It is ran by electric. Sometime still gets electric when coming to a stop. Means it not turn off to unlock. I unplugged my.
  17. dbduts

    dbduts Member
    Messages: 59

    Thanks for all the info I took off throttle body and cleaned everything and ran sea foam through engine runs like new
  18. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Make a huge difference. Glad it worked out for you.
  19. dbduts

    dbduts Member
    Messages: 59

    You and me both I spent enough this year already