New member with high idle problems when cold.
I am fairly new to this club and I am hoping that some of you can help me with a problem I have been fighting for about a year or so.
The car is a 96 Bonneville with the K engine. In the morning when the car is first driven, the idle will usually be excessively high. Sometimes as high as 3300 RPM'*. I will have to sometimes put the car in neutral and shot it off and then restart it to "reboot" it. This will usually help, but the then the idle goes excessively high once again. If the idle is not too high and I come to a complete stop, and then wait about 2 seconds, the VSS detects the car is stopped and it will drop the idle to somewhere under 1000 RPM'*.
I did not have this problem all summer, but it returned this fall. I have replaced the IAC motor and the plastic intake manifold. IT still does it. Does anyone have any ideas to try? Unfortuneatly(sp) I do not have a scan tool at my disposal as of yet.
Some ideas I have thought of as possible culprits were the engine computer. a temperature sensive leaky vacuum, or some other sensor.
Any help would be appreciated.
Thank you in advance\