IAC Unplugged - Saab 9000 Bulletin Board - Saabnet.com


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IAC Unplugged
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Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Thu, 11 Jan 2018 07:18:29 Share Post by Email
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Because the IAC usually is plugged in I'm documenting what happens when it isn't. This happened recently when my indy did a head gasket job and forgot to attach the electrical harness at the back of the IAC. The car is a '96 CS FPT automatic with 244K miles.
• When the engine is stone cold it will either stall or idle very slowly around 400-500 rpm. You have to give it a little throttle to prevent stalling.
• After driving a block or two the engine will idle by itself around 600-800 rpm in drive. It is not a robust idle, but the car is driveable.
• Even after a number of drive cycles and over 1,000 miles the abnormal condition does not trigger a check engine light or even a pending OBDII code.
• After connecting the IAC the T5 computer will not be able to re-adapt, resulting in weird surges when the computer overcompensates for conditions like the compressor running. After connecting the IAC disconnect the battery long enough to make the computer relearn everything.

When the T5 computer applies 12V to the IAC the valve opens. The valve closes in the absence of electrical power. However, in the "closed" position the IAC allows enough air to flow through for the car to remain driveable.


->Posting last edited on Sun, 14 Jan 2018 12:16:55.
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