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Re: '93 900S Idle Speed Posted by JimBlake [Email] ![]() ![]() ![]() In Reply to: '93 900S Idle Speed, Bernardi, Tue, 17 May 2005 09:24:10 Members do not see ads below this line. - Help Keep This Site Online - Signup |
If it's like the '89 I had, the idle is controlled by the ECU.
Check to make sure the throttle cable isn't sticking, or maybe adjusted too tight. Throttle needs to close completely. The little mechanical stop screw on the throttle should only just barely touch. It's only job is to keep the throttle plate from wedging tight when it closes. Most likely you shouldn't mess with that.
The AIC valve is near the throttle body, mounted in a rubber ring & clamp. Take it off & clean it with throttlebody cleaner, the rotor inside should spin smoothly & it's spring-loaded. Clean out the T-B bore where the throttle plate closes.
Then most importantly, look for vacuum leaks & fix them.
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