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Re: 90 Cutlass fast idle poor gas mileage
yeah tps throttle position sensor. No if u unplug the maf it should either run the same or the idle should increase.
Is the check engine light on when the car is running? Have u tried unplugging the battery to reset it?
I would test the tps, throw a voltmeter on the a and b leads of the tps with ignition on, it should between .4-.7volts at idle and read 4.5+V at WOT. You should notice an improvement with the clean IAC, if it doesnt fix it youll probably need a new one (junkyard=free). Thats my guess, how/when did the problem with the idle start happening? cos IAC controls the idle and its probably stuck in the closed position. but try all that and see what that does.
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