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Re: AIC Valve location on 93 Turbo w/tcs?
Posted by Paul R (more from Paul R) on Sun, 18 Feb 2001 17:49:20
In Reply to: AIC Valve location on 93 Turbo w/tcs?, Jeff Malin, Sun, 18 Feb 2001 17:26:29
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What you describe as "there's a cylindrical sort of device with hoses going into it forming the bottom of the throttle body" sounds like it's it. There should be two hoses going to it with a wire connection. Disconnect it and clean out with carb cleaner, sling out the excess, then spray in some lubricant like Liquid Wrench (not WD-40, it's not a lube). But just doing that may not necessarily be the cure. You said it was more evident when the car was cold. It sounds like it could be the AMM (air mass meter). When your car's cold the AMM unit measures temp and regulates (or enrich) fuel until the oxygen sensor kicks in. If your car seems better when warm it may in fact be the culprit. I've heard the FI water temp sensor can also cause similar symptoms. I suggest starting from basics and clean out your AIC, check base idle, etc, etc. The AIC valves purpose is to regulate base idle when a load is applied. Like turning on your A/C; the idle drops and the AIC in turn opens allowing the idle to rise back to normal. When you remove the AIC look inside the ports that the hoses were connected to. They should both be closed. If one appears slightly open it could indicate that the AIC is beyond just a clean and lube and may need replacement as the valve is stuck. I had similar problems on my '88 9kt and had to replace the AIC, the AIM and properly adjust base idle. After all that it's been smooth starting and driving. Hope this helps.
Paul R
88 9kt
118K
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