Codes P0171 & P0174 on 2002 Chevrolet Tahoe

When it is cold

by in Wake Forest, NC on February 01, 2013
1 answer 5 comments
ANSWER by , February 01, 2013
What engine?????
COMMENT by , February 02, 2013
4.8
COMMENT by , February 02, 2013
First suspect is vacuum leak at intake manifold. Not the only possibility though. Prob. need to get a mechanic to check it out.
COMMENT by , February 02, 2013
I work part time at a shop. can it be check with carb spray
COMMENT by , February 02, 2013
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!
COMMENT by , February 02, 2013
thanks