What kind of smoke? What does it smell like? It's likely either steam or burnt oil. You didn't mention the outside air temperature.
When was the last tuneup? Have your vacuum lines checked for cracks/breaks/leaks. Is the check engine light on? Does it work? Does this problem occur both when the engine is warm or cold? There is a air control for idle speed called the IAC valve. It's electrical/mechanical located up behind butterfly/throttle assy top rear right side of motor by windsheild. It bolts on with 2 little bolts.
The idle speed on car is totally computer controlled using sensors and the IAC.
The egr valve can also effect idle if it is dirty/sticking/leaking.
Also the TPS can be faulty, it senses the gas pedal position. Which determines fuel/air ratios which if 2 lean/rich can lower the idle speed. Idle meaning your foot is not on gas pedal.
Sunday, December 13th, 2009 AT 10:12 PM