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I have a 1989 T-Bird that has suddenly started idiling too high, can you tell me how I can lower the idle?

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  • 42 Answers

Check for vacuum leaks.

Posted on Oct 23, 2013

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Posted on Jan 02, 2017

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SOURCE: 1989 honda prelude enigne idles high then low irratic

I had the same problem on a Rover. There was a leak in inlet manifold that was caussing the problem.
To verify, spray some sealant to temporarily seal the inlet manifold .and the eratic idling should disappear for some time.
If it does, you know there is leak in inlet manifold which you can take of and refit with a new gasket.

Posted on Oct 27, 2008

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SOURCE: High Idle speed on 1989 Merc Sable, 3.0L V-6. Approx 2000 RPM

My wife had a 93 ford tempo 4 cylinder with same problem.It turned out to be the idle air solenoid mounted on the air intake manifold.

Posted on Jan 17, 2009

  • 2 Answers

SOURCE: 1989 ford f350 460 gas

89 Has EFI not carb. I vote to give you a ZERO!! The problem is more likely the IDLE AIR CONTROL VALVE (no sh!@#) "IDLE"????

Posted on Feb 04, 2009

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1 Answer

89 thunder bird lack of power


The high idle could be causing the noise - or it could have a vac leak. I would check the computer for trouble codes first.
Could have a faulty O2 sensor or map sensor - depending on that possible vac leak.

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My 1998 Explorer on startup idiling to high, it occasionally revs up and down while idiling. Is there a trottle position sensor that controls the idiling rpm?


there is a tps located on the intake where the inlet tube for air intake connects, it would be on the left side of the throttle body. does the trk run rough on idle? up/down sputter sometimes stall? Is check engine light on? if no light,check all vacuum lines for cracks/splits loose fit. do this by spraying carb choke cleaner on connections motor rpms will change if leak is present. also spray around perimeter of intake housing where mates with lower intake if engine revs you have bad intake gasket.I Just replaced upper and lower intake on my 98 and shazaam, runs like it should. but do your checks first,unessasary fixes are costly and **** you off.

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Hate to tell you this but sounds like the problem is a vacuum leak. This will make the engine rev. Check all the vacuum lines before making any adjustment. Have to dig out some of my old books to find factory settings for that carb. Good luck and I will try to find in case you need them to restore carb settings.

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My wife had a 93 ford tempo 4 cylinder with same problem.It turned out to be the idle air solenoid mounted on the air intake manifold.

Jan 17, 2009 | 1989 Mercury Sable

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Chyrsler sebring lxi 1995 2.5 v6 24 valve


ok this sounds easy when you ran the vehicle the computer controled the idiling motor now that you replace the idiling motor the computer hasnt been reset to except the new parameters
once you reset computer this should bring the idle back down to its specified idle
you can also adjust back of gas pedel the idle cable and on the throttle body by the idling screw

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