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Surge at idle.

My '86 Turbo Coupe surges at idle, goes anywhere from 800rpm to 1200 rpm. What do I need to look for/ adjust? It does it only when warm.

sounds like an IAC valve.

Tell me more, what is this valve?

Idle Air Control valve - usually cleaning it will solve the problem ....or you may need to re adjust/replace your TPS (throttle position sensor)

nine times out of ten on the 5.0 car its the IAC. clean it out like mentioned before with some carb cleaner. this has fixed every five litre car i've owned... pretty sure the IAC works and doese the exact same thing both 2.3 and 5.0 cars......
1991 Camaro road racer
1986 Saleen turbo 5.0 track toy.
1988 Notch crap box. 2.3t
1985 Cougar XR7 2.3t

Also check and make sure your orange O2 sensor ground wire is getting a good connection to the bolt on the turbo's inlet airhorn.


86 Mustang SVO 125k miles
-Ric Gillis Boost Valve
-K&N Cone on VAM
-Early style SVO headlight conversion
-Borla Turbo Mufflers
86 Mustang SVO - Sold long ago

Could also be the TPS. Check out the article on NATO on how to clean teh IAC and set the TPS.
Newbie with dumb newbie questions...
some wiring diagrams and by some , I mean none at all.
1984 GT350 T-top New pics
1984 Turbo GT T-top 419rwhp

Thank you guys I will check the IAC and TPS tommorrow. The ground is good on my O2 sensor.

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