3S-GTE JDM 3rd Gen Turbo Engine Gen 4 High idle (No vacuum leak) [Archive] - Toyota MR2 Message Board

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Just an FYI but for some reason the Gen 4 IACV motor can easily be installed slightly off if you remove the two 5 point screws that secure the motor. The symptoms of this are the car idling at a steady, higher rpm from normal. The fix is to loosen the two screws, warm the engine up, and then physically rotate the motor until the desired rpm is achieved.