Question about Chevrolet C3500

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1997 chevy w 6.5 diesel finally got it to crank an run will idle but when u touch accelerator it dies...scanned for codes none found pedal was also working ...went as far as taking one out of a running truck same problem....will try to accelerate when engine cold an wont die but as engine warms up the minute u touch pedal it dies...truck has bn sitting for several years....it always starts rite up

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  • brokefiveoh Aug 20, 2010

    this truck is a diesel ...like i said it will start an idle just dies when accelerator is touched no dtc an scan tool indicates accelerator is functioning properly....fuel is fresh as is filter...again it is a 1997 6.5 turbo diesel

  • brokefiveoh Aug 20, 2010

    ok heres the problem everyone keeps giving solutions for gas motors this is a diesel there is no throttle body, no mass air meter, no iat sensor, no tps sensor,[ its built into throttle pedal.]...i do apreciate the info on throttle pedal..have tried swaping pedal w one out of a running truck an still no luck

  • brokefiveoh Aug 20, 2010

    i apreciate the answers but so far they are for a gas rig mine is a diesel...there is no throttle body,mass air meter, iat, tps sensor as far as i knw is built into accelerator pedal[ which i swaped out of a running truck w same results, pedal out of my truck worked in other one]an i have checked for vaccum leaks.. again thanks for any help

  • brokefiveoh Aug 21, 2010

    thank u tht is a valid conclusion am going to try those links...also gonna try reflashn the computer...again thanks alot

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  • Chevrolet Master
  • 17,970 Answers

Possible tune uo request and fuel system cleaned.

Posted on Aug 19, 2010

  • ZJ Limited
    ZJ Limited Aug 20, 2010

    This is only the second time I have heard of it happening, and I don't
    think an exact cause has been determined yet. The other case is still
    under diagnosis; that truck had the injection pump replaced, but it
    didn't help (dealer really didn't know what else to do). Consensus
    seems to say that it's probably a wiring or computer problem, i.e. the
    computer isn't reading any movement from the throttle pedal, either
    because the signal is getting lost before it gets to the computer, or
    the computer itself is just going haywire. I'll check on this other
    case and see if it has been solved yet.

    You could try to get the engine to kick up into high idle RPM's. In this
    way you might be able to rule out the Accelerator Pedal Positioner
    sensor versus computer fault.



    For starters read this message thread in the 6.5L Turbo Diesel Forum


    Also the National Truck Equipment Association has fast idle technical reports that you can purchase:
    Could started with the NTEA Aug. 1997 (TR97-08?)"Fast Idle Procedure for
    1998 GM 6.5L Diesel Engine" (it's old web address is dead, I had lucked
    out finding it.)

    Which lead me to an April 1994, T94-6 "1,360 RPM Fast Idle PROM For 1994 GM 6.5L Turbo Diesel Engine"

    And to a November 1993, TR93-8 "Fast Idle Procedure for 1994 GM 6.5 Turbo Diesel Engine"


    Good luck

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  • Master
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If you can drain all the fuel and change all the fuel filters and add some conditioner as well it would appear the fuel is causing the problem.

Posted on Aug 21, 2010

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  • Master
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The accelerator pump is not working. Remove the air cleaner top and with the engine OFF, If things are working properly, as you look down you should see a little gas squirt out If that doesn't happen, either the float level is way low, the accelerator pump needs rebuilding or adjusting, Vacuum leaks can cause this also, but check the pump first.If all this checked ok then,Accelerator Pedal Positioner sensor needs to be checked.The "drive by wire" accelerator pedal (APP) has a triple redundant circuit. When one is out, it may set a code but continue to run, but if two or more are out, the engine is only permitted to idle but it will not give any code in most cases. In your case also there are codes retrieved in diagnostic test and truck is running in idle.Consensus seems to say that it's probably a wiring or computer problem, i.e. the computer isn't reading any movement from the throttle pedal, either because the signal is getting lost before it gets to the computer, or the computer itself is just going haywire. Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Aug 20, 2010

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  • Chevrolet Master
  • 19,396 Answers

Hi.

Have a look at AIT and MAF sensors and check idle air control valve. From description it looks like the mixture is too rich at cold, engine will shut down when you press the pedal because is flooding. The ones listed are the parts that can cause the problem.

Check also for vacuum leaks. A small vacuum leak may cause idling problems, particularly at cold, in that case mixture will be lean because the vacuum is svcking extra air into the mixture through the leak.

I think problem is IAC valve or IAT sensor.

Posted on Aug 19, 2010

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