The symptoms match what happens when the Engine Computer loses its memory. It must relearn "minimum throttle" before it will know when it must be in charge of idle speed. Until that happens, it will idle too slowly and stalling at stop signs is common. A second clue is you will not get the normal "idle flare-up" when you start the engine. That's where it goes to 1500 rpm for a couple of seconds, then down to 800 rpm.
To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the brake or gas pedals.
There can also be a problem with the automatic idle speed motor. Your mechanic can connect a scanner that can command the AIS motor to various positions which will raise idle speed in 200 rpm increments. That test can show if the motor is working properly.
Caradiodoc
Tuesday, January 25th, 2011 AT 2:56 AM
