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Q: My car idles high in park and neutral. Could it be valve adjustment is needed? on 1991 Toyota Celica

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The rpm gauge is busted but the idle is high in park and neutral. It also surges (goes up and down) a little when at red lights. I have replaced the throttle position sensor and the idle air control valve(new parts). A mechanic also replaced the timing belt because there was 100,000 miles on the engine. I read that It is a common problem with this model car-the valves needing to be adjusted. I just wanted to know If valves could be causing it? I have not checked for vacuum leaks or proper grounding of the two replaced items(iac & throttle sens). I cleaned the throttle body/IAC with throttle body cleaner. Google searches keep pointing to things I have addressed. Any ideas? I'm also getting a 51 obd I code but my AC works fine.
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Sounds like your idle air control valve,removing and cleaning may work but you probaly have to replace it.
If you read more then the title you would know that I have already replaced the IAC valve with a new replica. I'm looking for alternative solutions!
Sorry ,when i clicked on your question all it showed me is that you had a problem with your idle,vaccum leaks could definetly could cause your problem,leaks at the intake manifold,i just switch an intake gasket on a 95 accord and it solved the problem,removing the intake and cleaning the inside with a coat hangar and carb cleaner could help.i have never seen valves cause this problem but adjusting them cant hurt,they need to be after 100,000 miles.
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