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2001 Chevrolet Suburban 1500 Question: Stalls during hard left turn

 

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rfay, San Diego, CA, June 11, 2010, 09:26
 Rookie

Engine stalls frequently while making a hard left U-turn.

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  • Answer #1

    June 11, 2010, 10:45
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     Master

    Sounds like the idle control is not raising or boosting the idle speed to compensate for the added load of the power steering system. Does it idle just fine when making a hard right hand U-turn? Try that to see how the vehicle reacts.

    here are some shops if you need help

    http://repairpal.com/directory?address=92121&car_brand_names=Chevrolet

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    rfay, June 17, 2010, 10:58
     Rookie

    Thanks for the reply. Sorry I took so long to reply back. Work has been busy.

    I did some tests the other night in a cul-de-sac to try to narrow the syptoms down.

    During a hard right turn (steering wheel all the way cranked) it doesn't stall and I can't see any issues with the idle. The RPM stays at 400.

    During a hard left turn (fully cranked)it stalls 20% of the time and the idle is around 200. The engine struggles a bit to keep running almost everytime.

    If I don't crank the wheel hard but back off a bit the engine is fine. Also, if I keep my foot on the accelerator a bit during a hard left turn it doesn't stall.

    One last piece of info, I have noticed maybe 10% of the time when I am stopped and parked but idling the engine stalls.

    Not sure why the hard right turn doesn't cause a stall but I'm am thinking like you that an idle adjustment in the computer? may be needed.

    What do you think? And thanks again.

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    Visitor, December 30, 2010, 16:30

    I have the same problem and when it stalls, I'm able to start it right back up. I've noticed the same as you, that if I can keep my foot on the accelerator, it's less likely to stall. Something new that's come up (but it doesn't do it every time) is that as it stalls, the "low fuel light" flashes then goes right back out even though on both occasions that I've noticed it I had a 1/2 tank of gas. Curious to know if you've found resolution. Thanks!

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    Visitor, January 04, 2011, 08:55

    This is what I have found for a fix. I have not done it yet as my problem is intermittent. For my problem I would think that cleaning the throttle body (see below) may not help since the stall only occurs during hard left turns. But I would think that have the idle level reset or set a bit higher to compensate for the extra load of the power steering would do the trick. I also heard there might by a problem with the fuel pump that is in the gas tank if you see the fuel light come on during this.

    Here is the answer I got.

    There is a service bulletin for that issue on your truck. The correction is to clean the throttle body and update the engine software. You can clean the TB yourself but a dealer may do this for you for free.
    Let me know how this works out.
    See bulletin below.

    Bulletin No.: 04-06-04-040
    Date: June 14, 2004
    TECHNICAL
    Subject:
    Idle Instability, Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body)
    Models:
    2002-2003 Cadillac Escalade, Escalade EXT
    2000-2003 Chevrolet Silverado, Suburban, Tahoe
    2002-2003 Chevrolet Avalanche
    2000-2003 GMC Sierra, Yukon, Yukon XL
    with 4.8L, 5.3L or 6.0L V8 Engine (VINs V, T, Z, N, U - RPOs LR4, LM7, L59, LQ9, LQ4) and Electronic Throttle Control
    Condition
    Some owners may comment on an idle instability, low idle speed or rough idle.
    Cause
    Condition may be caused by deposits in the throttle body bore.
    Correction
    Clean throttle body bore and throttle valve plate of carbon using a shop rag and an appropriate cleaner. Refer to Engine Controls Repair Procedures - Throttle Body Cleaning Procedure. This procedure may be performed at any mileage necessary. Check to determine if the PCM calibration has been previously updated to one that includes the update for throttle body coking. For 2003 model year vehicles, look in the operating system portion of the calibration. For 2000-2002 model year vehicles, look in the engine portion of the calibration. If not, then update the PCM calibration to the latest calibration.

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