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1/2 ton problem

Discussion in 'Chevy Trucks' started by robo01, Dec 28, 2007.

  1. robo01

    robo01 Junior Member
    Messages: 17

    When its cold outside my truck revs at 2grand RPM when i start it up and then it shuts off and sharts back up and does it again. Can anyone give me so advise i think its my mass air flow sensor.
  2. robo01

    robo01 Junior Member
    Messages: 17

    24 views and no one can help me out come on guys...
  3. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    It's kinda tough to help without info on the truck robo...

    "1/2 ton" doesn't tell anyone much... it's kinda like going to the doctor and saying "I'm hurtin Doc, whats wrong with me?"

    What year?
    What engine?
    How many miles?
    Manual or auto?
    Have you done anything yet to try and rectify the problem?
  4. Milwaukee

    Milwaukee 2000 Club Member
    Messages: 2,180

    I look at his another thread it is 2002 1500 5.3 X-cab

    I am not expert with gm but 5.3 is 350 engine or different?

    I am not understand what you say that it start then stop.

    You sat in truck then try start it run at 2,000 rpm? did you push gas pedal to get 2,000 rpm? Then it make noise like backfired then stop?

    Do you have light on dashboard say engine is service?

    I have idea why not you try remove air filter then try start then see if it is air filter? What last time you change air filter?
  5. 84fordman

    84fordman Junior Member
    from maine
    Messages: 7

    airflow sensor fix

    it sounds like the mass airflow sensor got detached somehow. I have unplugged mine before and it does just what you say. The only difference is that my engine didnt have any power when it was unplugged. The airflow sensor might just be malfunctioning when its cold due to you having to replace it. Hope this helps. Good luck with it
  6. streetfrog

    streetfrog Senior Member
    Messages: 337

    withut any truck info A common cause of the problem as described is 1 of 2 things. Idle air control valve (IAC for short) or the cold start valve. But that is just an educated guess as I have no pertinent info. Mechanic for over 20 yrs
  7. robo01

    robo01 Junior Member
    Messages: 17

    im sorry its a 5.3 X cab silverado 4x4 2002. when i start it in the morning and just sitt there it idels that high and shuts off my service engine soon light is on cuz my bank 1 oxygen sensor needs to be replace BUT the light only comes on when its cold outside.
  8. sechracer

    sechracer Senior Member
    Messages: 478

    I know you said the light is only on when its cold out, and that you need a new O2 sensor. However, have you had the codes pulled since this started happening? I would lean towards the IAC or map.
  9. niv

    niv Member
    from midwest
    Messages: 38

    Have someone download the codes it shouldn't be very costly thats a very common setup,and you can avoid what I did by throwing parts at it.Best of luck!
  10. Jgrub75

    Jgrub75 Member
    Messages: 30

    I Would second this and add a poosable vacuum leak as well.
    Last edited: Dec 30, 2007