>Can anyone tell me how to adjust the idle speed or if there is something that would cause my idle speed to increase >(plugged vent, etc) that I should look for. The engine was recently rebuilt and has about 80 hours on it. I found a >throttle stop limit screw on the throttle valve on the air intake) and turned it out an additional 2 turns, but the idle >remains the same. I'm assuming there is an adjustment on the servo or somewhere else??? Any assistance would >be appreciated.
>Darin Danelski - N7963L

Sounds like an air leak in the intake. There are LOTS of clamps and couplings that could leak, and the "extra" air is making the engine run too fast. Because the injection is normally richer than required for optimum operation, small to medium leaks only make it run faster. On a car you'd almost certainly have a miss on one or more cylinders with an intake leak at idle, but aircraft injection is sloppy rich, so that masks the true cause.

--Bob Steward A&P IA
Birmingham, AL


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