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Truck Surging Idle in Drive while stopped...

This is a discussion on Truck Surging Idle in Drive while stopped... within the Technical / Maintenance forums, part of the General Discussion category; It surges from about 300-600 rpms only in drive at idle, such as stopped at a red light. I read ...

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    Truck Surging Idle in Drive while stopped...


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    It surges from about 300-600 rpms only in drive at idle, such as stopped at a red light. I read somewhere that it may be the distributor. Any truth to this? If so, how do I check/fix it?

    Thanks,

    Matt
    01 RCSB Z71 leveled on 285's. Stock for now.

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    Re: Truck Surging Idle in Drive while stopped...

    What year if it is a 96 up ... could be mass air flow sensor.
    Clean it see if it helps.

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    Re: Truck Surging Idle in Drive while stopped...

    My truck did that and after replacing a bunch of things I finally figured out it was the fuel pressure regulator,the diaphragm was leaking.

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    Re: Truck Surging Idle in Drive while stopped...

    Try cleaning/ replacing the idle air control, on my 97 it would only surge with the a/c on and I replaced the iac and problem solved




    1997 RCSB Z71 5.7 Vortec, 411 PCM , Ultra gauge, SS Headers, EGR Delete, Magnaflow Hi-flow cat assembly, Cat back with flowmaster 40, Transbuilderguy Built 4l60E, Yukon Duragrip Posi 3.73, 33 x 12.5 Maxxis Big Horn

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    Re: Truck Surging Idle in Drive while stopped...

    Its a 97. I just cleaned the MAF, but dont have time to drive it tonight. We will see in the morning if that was the culprit. I hope so. The screen was dirty but not bad. If it keeps surging, I'll have the shop look at it.

    Thanks

    Matt
    01 RCSB Z71 leveled on 285's. Stock for now.

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    Re: Truck Surging Idle in Drive while stopped...

    my truck does this . all started after the tune .
    1996 ecsb z71 3.73 g80 5.7 b&m shift improver , vette servo , 30k cooler , 7 quart huges trans pan circle d 2800 stall,160tstat ,k&N intake , ceramic coated eddlebrock headers. true dual flowmasters 2.5 inch and H pipe black bear 91 tune .and a frantz bypass oil fitration kit, 125 hp wet nitrous

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    Re: Truck Surging Idle in Drive while stopped...

    Still doing it. Tech at work said it sounds like a vacuum leak. He's gonna look at it on Monday.

    Thanks

    Matt
    01 RCSB Z71 leveled on 285's. Stock for now.

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    Re: Truck Surging Idle in Drive while stopped...

    Scanner said MAF is not functioning properly. Tech said the truck is running very rich. Does this make sense? Would a MAF sensor on the fritz make the idle fluctuate only in drive? Is there more?

    Matt
    Last edited by mattoo18; 04-21-2011 at 06:17 PM.
    01 RCSB Z71 leveled on 285's. Stock for now.

  9. #9
    GMC RULZZ NEUMANNZZ's Avatar
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    Re: Truck Surging Idle in Drive while stopped...

    yeah it makes sense
    O2 GMC RCSB 4.8L V8 AUTO 3.73's
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    Re: Truck Surging Idle in Drive while stopped...

    Swapped in another MAF from a different truck and brought it home... still doing it. Any other thoughts guys? I doubt both of us have bad MAF sensors.

    Thanks

    Matt
    01 RCSB Z71 leveled on 285's. Stock for now.

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    Re: Truck Surging Idle in Drive while stopped...

    Said it is running rich.. maybe coolant temp sensor... or 02 sensor.
    Sometimes will not bring a code. A bad map or loose vacuum will cause surging.

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    Re: Truck Surging Idle in Drive while stopped...

    97 vortec common issues: maybe leaking fuel poppets or fuel regulator. intake gasket, poppets ever replaced?
    O2 GMC RCSB 4.8L V8 AUTO 3.73's
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  13. #13
    Whats that smell? cruizerman's Avatar
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    Re: Truck Surging Idle in Drive while stopped...

    Yes, I know this is an OLD post, but I'm having the exact same issue on my 99 OBS K1500 tahoe. It's happens every couple of stops while in D at a stop.

    To the OP, did you ever figure out what caused your issue?

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