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This is a pculiar problem and I guess it is not going to be easy to diagnose and rectify.
Questions would be asked as we go along to understand the problem better and hopefully we can get the problem fixed.
What is the idling speed when A/C is off and engine at operating temperature?
Does the idling speed drop and goes back up when A/C is turned on?
HAs anything been done to try to rectify the problem.
Symptoms indicates a fault with the idling circuit and it could be the IAC and throttle body that is dirty and requires cleaning. If they had not been cleaned before, get them cleaned and retest.
Monday, August 16th, 2010 AT 9:18 AM