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2002 Chevrolet Tahoe Question: Codes P0171 & P0174

 

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powell, Wake Forest, NC, February 01, 2013, 18:35
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When it is cold

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    pushrod February 01, 2013, 21:52
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    What engine?????

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    powell, February 02, 2013, 03:25
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    4.8

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    pushrod, February 02, 2013, 04:12
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    First suspect is vacuum leak at intake manifold. Not the only possibility though. Prob. need to get a mechanic to check it out.

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    powell, February 02, 2013, 04:17
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    I work part time at a shop. can it be check with carb spray

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    pushrod, February 02, 2013, 04:33
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    Cool, now we can talk motors! Yes that will work, check all the other stuff also like MAF may need cleaning, upstream O2's
    Use a scanner, you will find it!

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    powell, February 02, 2013, 04:35
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    thanks

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