So the kid, against my advice, brought home a 1992 Accord 2 dr coupe with a rough 150K miles. 2.2 engine, AT. Runs OK except it has a high and uncontrolled idle. Sometimes revs to 3K RPM on cold start. Eventually goes down to about 1.8K RPM engine fully hot. Never any lower when in Park. Obviously at that speed it slams into gear.
Started looking it over. First thing I noticed is that the check engine bulb is burnt out. Very suspicious. Tried cleaning the IAC, thinking that it might be dirty and stuck. Yes, it was dirty but cleaning had little effect. Idle did come down slightly. So we tried a new IAC. No difference. I did check the throttle body and the pedal linkage and it is fully closed against the stop.
Looking for some advice. Could a vacuum leak cause the idle to go high? Or perhaps a bad TPS? I don't want to just throw parts at it. For some reason the ECU is keeping the idle way up there and I'm stumped.
Started looking it over. First thing I noticed is that the check engine bulb is burnt out. Very suspicious. Tried cleaning the IAC, thinking that it might be dirty and stuck. Yes, it was dirty but cleaning had little effect. Idle did come down slightly. So we tried a new IAC. No difference. I did check the throttle body and the pedal linkage and it is fully closed against the stop.
Looking for some advice. Could a vacuum leak cause the idle to go high? Or perhaps a bad TPS? I don't want to just throw parts at it. For some reason the ECU is keeping the idle way up there and I'm stumped.