1999 Silverado 5.3L bog down after startup

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Thread: 1999 Silverado 5.3L bog down after startup

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    1999 Silverado 5.3L bog down after startup

    Hi,

    I have a 1999 Silverado with the 5.3L Vortec and 114k miles. It is stock except for a K&N air filter (just cleaned),dual exhaust and 285/75/16 tires. I have been noticing a problem lately that has me concerned. When I start the truck up, I always let it warm up for a minute before driving. Lately when I first take off, if I give any more than very light throttle, it bogs down, hesitates, acts like it canít get out of itís own way. Then after 10 seconds or so, it runs normally.

    I also notice that sometimes when I am in overdrive and I slow down, then accelerate it doesnít downshift and gets bogged down at low rpm and studders a bit, which I remedy by pushing the tow/haul button to get it to down shift. My theory is that this is caused by my 285/75/16 tires being larger than stock.

    Anyone have any insight? Another thing to consider is that I had the fuel pump replaced about 30k miles ago after it went bad. Not sure if that might have anything to do with the 1st problem

    Thanks for any input. I really appreciate it.

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    Re: 1999 Silverado 5.3L bog down after startup

    Sounds like it could be a fuel pump, but since you mention that you just cleaned your K&N, are you sure you didn't over oil it? There have been issues with MAF sensor fouling resulting from too much oil being applied which could cause symptoms like this.

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    Re: 1999 Silverado 5.3L bog down after startup

    I'd check that MAF as already mentioned. Plus it's time to change that fuel filter again if you haven't already.

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    Re: 1999 Silverado 5.3L bog down after startup

    Thanks for the tips. How do I check the MAF sensor, aside from just replacing it?

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    Re: 1999 Silverado 5.3L bog down after startup

    Quote Originally Posted by SDHoosier View Post
    Thanks for the tips. How do I check the MAF sensor, aside from just replacing it?
    Just buy a can of MAF cleaner and spray it down.

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    Re: 1999 Silverado 5.3L bog down after startup

    Thanks!

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    Re: 1999 Silverado 5.3L bog down after startup

    Quote Originally Posted by SDHoosier View Post
    Thanks!
    It also might be beneficial to go to AutoZone or somewhere similar and get your codes read. Sometimes a MAF code or misfire code doesn't necessarily trip a SES light. By getting the problem determined this way you can save some cash from buying things you might not need.

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    Re: 1999 Silverado 5.3L bog down after startup

    I thought any codes would set of the SES light, so I didn't bother checking. Thanks for the tips.

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    Smile Re: 1999 Silverado 5.3L bog down after startup

    Quote Originally Posted by SDHoosier View Post
    Hi,

    I have a 1999 Silverado with the 5.3L Vortec and 114k miles. It is stock except for a K&N air filter (just cleaned),dual exhaust and 285/75/16 tires. I have been noticing a problem lately that has me concerned. When I start the truck up, I always let it warm up for a minute before driving. Lately when I first take off, if I give any more than very light throttle, it bogs down, hesitates, acts like it canít get out of itís own way. Then after 10 seconds or so, it runs normally.

    I also notice that sometimes when I am in overdrive and I slow down, then accelerate it doesnít downshift and gets bogged down at low rpm and studders a bit, which I remedy by pushing the tow/haul button to get it to down shift. My theory is that this is caused by my 285/75/16 tires being larger than stock.

    Anyone have any insight? Another thing to consider is that I had the fuel pump replaced about 30k miles ago after it went bad. Not sure if that might have anything to do with the 1st problem

    Thanks for any input. I really appreciate it.
    There is a TSB (Technical Service Bulletin) that will fix your concern. It involves a PCM reprogram. I have the same year model truck also with a K&N filter. I had my truck reprogramed for the same problem about 2 months ago. I only have 71,000 on my truck. Feel free to contact me for the TSB info.

    Regards,
    Gary

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    Re: 1999 Silverado 5.3L bog down after startup

    SDhoosier did you figure out the problem. I have the same issue with my truck.

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    Re: 1999 Silverado 5.3L bog down after startup

    GM Bulletin No. 01-06-04-006
    Date: February, 2001

    TECHNICAL

    Subject:
    Lean Hesitation, Sag or Stumble on light/moderate Acceleration

    Models:
    1999 Chevrolet and GMC C/K Pickup Models (Silverado, Sierra)
    with 4.8 L, 5.3 L or 6.0 L V8 Engines (VINS V, T, U -RPOs LR4, LM7, LQ4)

    Condition

    Some customers may comment on the following condition:

    A lean hesition, sag or stumble present during light to mederate accelerations.

    Usually only present on the first one or two accelerations.

    The condition occures when the coolant temp is below -6 Cel and +21 Cel (20 F and 70 F)

    Fuels with a high drivability index can also be a contributor.

    Cause:
    CALIBRATIONS NOT OPTIMIZED FOR VARIOUS OPERATING PARAMETERS.

    Correction:
    Prom reprogramming

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    Re: 1999 Silverado 5.3L bog down after startup

    SDHoosier READ THIS !!!!!!

    PCM - Lean Hesitation/Sag/Stumble on Acceleration

    Bulletin No.: 01-06-04-006

    Date: February, 2001

    TECHNICAL

    Subject:
    Lean Hesitation, Sag or Stumble On Light/Moderate Acceleration
    (Reprogram PCM)

    Models:
    1999 Chevrolet and GMC C/K Pickup Models (Silverado, Sierra)
    with 4.8 L, 5.3 L or 6.0 L V8 Engine (VINS V, T, U - RPOs LR4, LM7, LQ4)

    Condition

    Some customers may comment on the following condition:

    A lean hesitation, sag or stumble present during light to moderate accelerations.

    ^ Usually only present on the first one or two accelerations.

    ^ The condition occurs when the coolant temperature is between -6įC and +21 įC (20įF and 70įF).

    ^ Fuels with a high drivability index can also be a contributor.


    Calibration Information




    The Calibrations shown are electronic calibrations and are NOT available from GMSPO. Calibrations will be available from Techline starting November 2000, on the TIS 2000 version 19.5 TIS 00/2000 data update or later.

    Cause

    Calibrations not optimized for various operating parameters.

    Correction

    Verify that the drivability condition is not the result of an inoperative component, or a related wiring/other condition.

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