May 23, 201015 yr 1991 Legacy with the 2.2 I think I may have screwed up the idle setting. I adjusted the big screw in top of the throttle body in an attempt to adjust idle. I now realize that it is all controlled by the ecu. I now have it completely to the right cw. How do I put it back to factory setting?
May 23, 201015 yr That big screw on the top is a needle valve. If you have it completed closed off (CW) is the car running alright? If not, just un screw it a little until the idle seems about right. What you would really need to do is be able to monitor the idle air control valve's duty percent. Once it's in the range it's supposed to be, you could stop adjusting the needle valve screw. If you have a laptop and are adventurous you can use this program to monitor the ECU paramters. http://www.surrealmirage.com/vrg3/b10scan/ Other wise, do it by feel Make all adjustments when the car is fully warmed up.
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