Idle Stalls When Warm

hutch1 · Post by **hutch1** » 20 Oct 2011, 21:03

Greetings!

I have a 95 NA 850 with 190K. Been a good car, but I'm having a reliability issue.

When the engine is cold, the car drives great, and the idle is solid.

However, after the engine warms up, the idle is erratic, stumbles, and the engine stalls. As long as I give it gas, the engine is strong. Only the idle when warm is a problem.

I've cleaned the throttle body and butterfly, but no change.

I'm planning on doing the PCV replacement this weekend, as well as replace the vacuum lines.

What are the odds that this will also fix the warm idle problem? Are there other areas I should look as as well?

I appreciate any additional suggestions!

Post by **jblackburn** » 20 Oct 2011, 21:05

Vacuum lines may help. Once the car warms up it goes into closed loop mode and judges readings based on O2 sensor and mass airflow sensor values. Air leaks can throw off the fuel/air mixture and cause your car to run like crap.

Billc1015 · Post by **Billc1015** » 21 Oct 2011, 06:56

Have you checked to see if there is any black smoke coming out of the exhaust? It's possible your MAF is on its way out and giving false readings causing a richer mixture. When cold it would run fine because it needs more fuel when vold but after warming up, the extra fuel would cause symptoms like you are explaining.

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