My car runs and drives great once it's warmed up. My problem is that if I start it when the engine is cold. The engine will immediatly rev up to 3000 rpm, and then idle down real slow. After about 20 minutes I get a P0421 code. I found that if I disconnect the air intake hose from the Mass air sensor. The car will start up, and Idle perfectly.
I've already replaced the Idle Air Control motor, and Mass Air Sensor.
Thanks for your time.
have the same problem?
Tuesday, December 15th, 2009 AT 10:49 AM