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2002 hd runs bad

Discussion in 'Chevy Trucks' started by roteye38, Aug 5, 2008.

  1. roteye38

    roteye38 Member
    Messages: 40

    working on a friends 2002 2500 6.0 hd the truck barely will idle when tried to move it .it misses bad it blow a mass air flow code to start with thought it was the cat plugged changed the left side still the same maybe the module? any help
     
  2. LawnProLandscapes

    LawnProLandscapes PlowSite.com Addict
    Messages: 1,129

    make sure the mass airflow sensor (maf) isnt broke or disconnected, also pick up some maf cleaner and clean the wires off. check air filter for blockage... how recent did he change fuel filter?
     
  3. roteye38

    roteye38 Member
    Messages: 40

    cleaned mass air flow put new fuel filter on fuel pressure was 55 at idle 53 with just key on
     
  4. LawnProLandscapes

    LawnProLandscapes PlowSite.com Addict
    Messages: 1,129

    try unplugging maf and see how the truck runs then, maybe clean throttle body and clean throttle position sensor... check for vaccuum leaks... wouldnt hurt to add some fuel system/fuel injector cleaner..

    maybe B&B will stumble on this thread he'll probaly have it solved in no time .
     
  5. roteye38

    roteye38 Member
    Messages: 40

    cleaned throttle body ran seafoam dirrectly through the throttle body nothing changed
     
  6. LawnProLandscapes

    LawnProLandscapes PlowSite.com Addict
    Messages: 1,129

    you check and make sure all 8 are firing .
     
  7. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    What lead up to this problem? Did it run perfectly up until all of a sudden- or did it get worse over time?

    If you've got good fuel pressure, a MAF code, and it doesn't run right you probably have a MAF issue.

    What is the code specifically? Any other codes? The MAF on these trucks don't normally give any trouble but anything with more than one moving part or anything electrical can give your problems at any time for any reason.

    If you have access to a good scanner you can read the MAF counts and see what the MAF is or isn't doing...DON"T JUST REPLACE IT as it may not fix it. payup

    1) Check the electrical connection on the MAF itself. Make sure non are pushed into the connector housing. As well as insuring that they're clean and making good connection.
    2) Check the wiring harness were it travels over across the engine for any damage (rub through, furry critter evidence :eek: etc)
     
  8. roteye38

    roteye38 Member
    Messages: 40

    he is giving up going to take it to the dealership will let you know what the problem was thanks for all the help
     
  9. kmwharley

    kmwharley Member
    Messages: 94

    Keep us updated. I had a similar problem with my 8.1 and the rubber boot that seals the intake to the throttle body was not sealing. When I got it to seal ran perfect, pull it off and the truck craps out and sends the MAF sensor code. Hope it is simple as that.
     
  10. roteye38

    roteye38 Member
    Messages: 40

    buddy got truck back from dealer they said it had two bad injectors
     
  11. roteye38

    roteye38 Member
    Messages: 40

    he was wrong there is more wrong with it yet will let you all know when i get the right info
     
  12. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Yea I thought so...

    Might have had two weak injectors but I'm not surprised changing them didn't fix it. Needs future diagnosis... it's setting MAF codes for a reason unrelated to an injector problem.
     
  13. roteye38

    roteye38 Member
    Messages: 40

    buddy brought truck over didnt want to pay big money for fix at the dealer did compression test seven dead took valve cover off intake rocker spring broke get part tomorrow keep fingers crossed thats it
     
  14. roteye38

    roteye38 Member
    Messages: 40

    fixed spring truck running good again thanks for all the help
     
  15. Sydenstricker Landscaping

    Sydenstricker Landscaping PlowSite Veteran
    Messages: 3,882

    Having a dead cylinder will sure do that to you. Glad it is worked out.