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  1. 04-01-2009, 04:25 PM #1
    0TransAm0
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    2003 chevy 1500 problems???

    OK so my buddy has a 03 1500 with a 5.3l 55-60k miles
    been running like crap lately after it was warmed up at idle the rpm's would dip way way down like to 200 and it would want to die...i scanned it and we got 4 codes i forget what they were but it was about the MAF being bad/multiple cylinder misfires and both banks running to lean

    sooo he replaced the MAF sensor and the light went out and it ran good....

    for about a week then it started acting up again and i scanned it and the 2 codes i get are P0171 and P0174 bank 1 & 2 running to lean...

    my question is what could this be? 02 sensors? or something else?
    any help or suggestions is appreciated
    thanks Mike
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  2. 04-01-2009, 07:20 PM #2
    Sleeper Sierra
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    intake gaskets most likely pretty common on these trucks. I am laid off i could take care of it for you this week.
    artist formerly known as bad cutt.
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  3. 04-01-2009, 07:22 PM #3
    Holeshot
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    Quote Originally Posted by Sleeper Sierra View Post
    intake gaskets most likely pretty common on these trucks. I am laid off i could take care of it for you this week.
    x2 on the intake. Sounds like a serious vacuum leak.
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  4. 04-01-2009, 08:11 PM #4
    0TransAm0
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    ok this is not my truck its a guy that i work with... is thier a way i could "test" it easily to see if it is indeed the intake gaskets?
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  5. 04-01-2009, 08:25 PM #5
    Holeshot
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    Sure spray carb cleaner around the intake gaskets and see how it runs then, or you can do a smoke test if you have the machine to do it.
    Last edited by Holeshot; 04-01-2009 at 10:13 PM.
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  6. 04-01-2009, 08:44 PM #6
    0TransAm0
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    what will happen if it is leaking with the carb cleaner?
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  7. 04-01-2009, 09:32 PM #7
    Sleeper Sierra
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    it will idle higher or die with the carb cleaner
    artist formerly known as bad cutt.
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  8. 04-01-2009, 10:07 PM #8
    A B4C Z
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    probly intake gaskets! Let me know if you need it done!

    1998 Black on Black Regal
    2010 Black on Black Denali
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  9. 04-01-2009, 10:19 PM #9
    0TransAm0
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    i will let him know...if indeed it is the intake gaskets how much $$$ we talkin? again its not my truck but i will pass on the info and if he wan'ts to go threw one of you guys i can put him in contact with you..

    thanks for all the help
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  10. 04-01-2009, 10:22 PM #10
    Holeshot
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    Quote Originally Posted by 0TransAm0 View Post
    i will let him know...if indeed it is the intake gaskets how much $$$ we talkin? again its not my truck but i will pass on the info and if he wan'ts to go threw one of you guys i can put him in contact with you..

    thanks for all the help
    Not sure what book times are for the 5.3 but Im guessing average shop would be a few hundred parts and labor.
    Last edited by Holeshot; 04-02-2009 at 02:10 PM.
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  11. 04-02-2009, 02:08 PM #11
    brotherbenn83
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    Typically leaking intake gaskets would give you poor idle when cold and then it would clear up as the truck warms up. If there was a problem with an O2 sensor it would misfire after the truck goes in to closed loop, but you would also have a position 1 O2 sensor low voltage code.

    If it is intake gaskets, I'll do it for $200. LMK.

    EDIT: I actually get parts cheaper than I thought, I can do it FOR $175
    Last edited by brotherbenn83; 04-02-2009 at 03:23 PM. Reason: PRICE DROP
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  12. 04-02-2009, 04:28 PM #12
    0TransAm0
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    yeah it happens when the trucvk is warmed up too.. i will let him know as far as if he wan'ts you guys to do it or not. and if he decides to do so i will give contact info...
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  13. 04-05-2009, 02:34 PM #13
    brotherbenn83
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    Just did one yesterday on my Uncle's 02 Silverado. His had both bank lean codes and a misfire, fuel trim was reading 25% long term, now it's right at 0% where it should be.
    GM World Class Certified Technician
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