Electrical items are togh to diagnose as they fail gradually and have to fail beyond a certain threshold before they will throw a code.
Sometimes ECUs can still be fooled into reacting as if everything is ok and actually make the problem worse.
The first things that come to mind are the Idle Air Control Valve and the O2 sensor.
Even though the code is not there the reasons it is not throwing a code can help diagnose sometimes.
Let me know the following;
Does the car have performance or power problems at speed or anything other than idle?
What did the spark plugs look like when you pulled them?
If thewy were anything other than a Tan/Red, let me know.
I will check fo ryour response and respond ASAP.
Please consider a to help us answer more questions.
Sunday, November 21st, 2010 AT 2:04 AM