Originally posted by tn99fordcontour:
... the problem is it will not idle and its running very rich. the guy that has been working on it is abput to give up because he doesn't have a clue what and why its running like it is.my o2 sensors are fine. can someone please tell what is wrong with it,why wont it idle and why is it running rich....


Welcome. . Is the check engine light (yellow, CEL) on? Even if it is not, get it scanned (free service) at Advance or Autozone and post the codes. As previously posted, it could be the ECT or thermostat. Actually, it could be a lot of things but if you post the CEL codes, we would be able to give some more suggestions.

If it is indeed running rich, below could be some of the causes but we (you) really won't know until you get the CEL scanned and posted. and anything you do prior to that would just be a "shotgun approach".

P0172 - System Too Rich (Bank 1) The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The code sets when the adaptive fuel tables reach a lean calibrated limit. Fuel System:
�· Excessive fuel pressure
�· Leaking/contaminated fuel injectors
�· Vapor recovery system concern
Base Engine:
�· Oil overfill
�· Cam timing concern
�· Low cylinder compression
�· Excessive engine wear
Powertrain Control System:
�· PCM concern
Induction System:
�· MAF contamination

P0175 - System Too Rich (Bank 2) Same as DTC P0172, but Bank 2. See Possible Causes for DTC P0172

Last edited by Tony2005; 11/02/05 08:18 PM.
"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles