New running issue

delling3 · Jul 31, 2019

1996 GT, with automatic. Stock drivetrain at the moment. I have noticed a new issue which would like to get some thoughts on.

Took the car for a drive last night. Stop and go city driving, about 30 minutes of driving. Backing into the garage, stopped the car and shifted into park. Immediately after putting the car in park, the idle speed dropped and the car stalled. It started back up immediately when I hit the key, and seemed to idle just fine. Thoughts? I am getting ready to leave on a road trip, and hate to have something like this nagging me in the back of my mind.

TIA.

white95 · Jul 31, 2019

I believe you can have your tuner adjust that.

delling3 · Aug 1, 2019

I don’t have a tuner, so looking for other options. This is a new issue. Car had no issues previously. What does the IAC valve do, exactly, and could this be the cause? Car idles fine in gear, but shift to neutral or park, and it’s 50/50 that it’ll die. Starts right back up.

evilcw311 · Aug 1, 2019

Iac, Idle Air Control.

It’s the device that regulates just how much air is allowed into the intake when your foot isn’t on the gas. When your in gear it opens up, when your ac compressor is running it opens up. If your in neutral or park and ac isn’t running then it shouldn’t be open as much.

From what your describing it could be that the iac is either very dirty and needs a good cleaning or is faulty and needs replaced.

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