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Thread: HELP....Any auto mechanics here ?

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  1. #1
    RTR
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    Roger

    Nov 2017
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    HELP....Any auto mechanics here ?

    I have a 2002 Silverado 1/2 ton ,1500, 4x4, Z71 pick-up, w/140,000 miles that I've owned for 10 years.Its a 325 V8 all stock factory eng.The problem started During the last cold snap .....Once the outside air temp drops below freezing it starts up(like normal) w/o problems.But then,for the 1st 15 seconds it climbs to 2000 rpm.Then it will bog down(wanting to stall)...After about 90 seconds of driving its purring like a kitten.....BUT WHEN the outside air temp is above 40 degrees there is no problem at all w/start-up & or running..Truck has been well maintained.And I run dry gas in it. ...Thanks for your time.
    Last edited by RTR; Jan 09, 2018 at 03:22 PM.
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  2. #2
    RW
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    Ron

    Feb 2007
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    Mass Air Flow Sensor maybe?
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  3. #3
    RTR
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    Roger

    Nov 2017
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    Quote Originally Posted by RW View Post
    Mass Air Flow Sensor maybe?
    Could be .I think it was changed about 7-8 years ago......thanks
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  4. #4
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    Brad - Wolfpack Proud

    Jun 2013
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    No lights on dash right...? Obviously?. Do you or have you ran a fuel injector cleaner through your gas tank. Rising to 2000 rpm's may as RW said just an air flow sensor...? That would do it. Kind of like the old style choke sticking.
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  5. #5
    us
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    I believe it is the "Hot wire" Style MAF sensor, try some MAF cleaner on it and see if it gets better. If not the wire itself may have a break in it. A good shop can hook up a scan tool with live data and figure it out pretty quickly.
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  6. #6
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    Joe

    Nov 2014
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    Don't know if you have a Auto zone nearby, but here were I live they will hook a code reader to it for free. Might tell you if it's a sensor.
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  7. #7
    RTR
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    Roger

    Nov 2017
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    Quote Originally Posted by Limitool View Post
    No lights on dash right...? Obviously?. Do you or have you ran a fuel injector cleaner through your gas tank. Rising to 2000 rpm's may as RW said just an air flow sensor...? That would do it. Kind of like the old style choke sticking.
    Thanks........Yeah,during last summer I ran 'fuel injector cleaner' through it.

  8. #8
    RTR
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    Roger

    Nov 2017
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    Thanks guys for the help.Tomorrow is going to be warmer.I'll try all the above & see what happens.

  9. #9
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    Brad - Wolfpack Proud

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    Quote Originally Posted by relic nut View Post
    Don't know if you have a Auto zone nearby, but here were I live they will hook a code reader to it for free. Might tell you if it's a sensor.
    That's why I asked about any "lights". But even without an indicator maybe a code will pop up... hell I don't really know.
    relic nut and RTR like this.
    I am a true blue Patriot who believes in the original Constitution's meaning. I'll bleed blood to defend it and resist those who want to diminish or alter its meaning or those rights stated within the Constitution.

  10. #10
    us
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    Most of the auto stores around here will check for any codes for free. Thats the first place to start. You don't want to start just changing any parts.
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  11. #11
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    Todd In Lutz FL

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    Parts changing and a "no" electronic part return policy can and will get expensive pretty quick
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  12. #12
    us
    Jan 2010
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    OBD II Scanners are so cheap anymore, every vehicle owner should have one. It does sound like a MAF or IAC issue though.
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  13. #13
    us
    Jun 2013
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    Quote Originally Posted by RW View Post
    Mass Air Flow Sensor maybe?
    That is a very good tip and possibility. A good cleaning of the MAF is likely in order. Also, it would be best to clean the Throttle Body while you are doing maintenance on the truck.
    RTR likes this.

  14. #14
    us
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    Quote Originally Posted by RTR View Post
    Thanks........Yeah,during last summer I ran 'fuel injector cleaner' through it.
    Probably time to do a repeat and add some Fuel System Water Remover as you may have gotten some water in the gas tank and/or fuel lines due to condensation when transitioning from hot/warm to cool/cold temps.
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  15. #15
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    Randy

    Feb 2015
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    The MAF should throw the check engine light though? Is their any kind of preheater on the truck? It may not be warming the fuel at low temps. I do know that many sensors can cause this problem especially the MAP and TPS also MAF as said above but until it throws a code it will be very difficult to diagnose. I have this very same truck BTW it is Awesome!
    RTR likes this.
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