This only happens in the morning, invariably, I get ready for work, start the car, (i've tried letting it warm up) back down my driveway in reverse, no issues, I get to the end, back out into the road, shift into drive and when I press the accelerator the car bogs down or stalls completely. I start it back up and it runs fine, and continues to have no problems for the rest of the day. After working 8 hours it starts right up and drives home with no problems. I'm not sure whats causing this and I haven't gotten too deep into it yet. Anything come to mind?


1996 Pontiac Sunfire, Stock (Daily Driver)
1986 Camaro Z28, 383ci Stroker (Street/Strip Toy)
1986 Porsche 944 Turbo, Highly Modified (Track Car Project)

Do you have a header on your car? Mine does that almost all the time. It's because the car is going into open loop before the O2 sensor is hot enough to work correctly.

If it starts right up after 8 hours of sitting, its not likely an O2 sensor problem, 8 hours is plenty of time for it to cool to ambient. And it wouldn't be going into open loop, its already in open loop at startup. Once the sensor is hot, it will go into closed loop.

Its more likely an IAC problem. Clean the throttle body with throttle body cleaner (don't use carb cleaner), and see if that helps, if not, pull the IAC and clean its pintle and the bore it bolts into on the throttle body also. Let us know.

I was tired, it's easy to get those reversed sometimes

Happens to me sometimes too, no worries, we all knew what you meant.



Edited 1 time(s). Last edited Sunday, September 02, 2007 10:59 AM