Originally posted by CSVT985:
Heh, I always have a CEL on, but its always Too lean of mixture...


Bingo. Post the exact code. It could be a leak in the exhaust or vacuum leak.

Originally posted by Tony2005:
Originally posted by geop:
... Code p0171 system to lean-bank no.1. Would a leaking exhast gasket between the manifold and cat pipe cause that?


Yes. From TSB,
P0171 - System Too Lean (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The code is set when the adaptive fuel tables reach a rich calibrated limit. Fuel System:
�· Contaminated fuel injectors
�· Low fuel pressure or running out of fuel (fuel pump, filter, fuel supply line restrictions)
�· Vapor recovery system (VMV)
Induction System:
�· MAF contamination
�· Air leaks between the MAF and throttle body
�· Vacuum leaks
�· PCV system concern
�· Improperly seated engine oil dipstick
EGR System:
�· Leaking gasket
�· Stuck EGR valve
�· Leaking diaphragm or EVR
Base Engine:
�· Exhaust leaks before or near the HO2S
�· Secondary air concern
Powertrain Control System:
�· PCM concern


Last edited by Tony2005; 11/09/05 06:34 PM.
"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles