Question about 1991 Honda Accord

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Honda Accord 1991 idles high then low

Hi, I have a 1991 Honda Accord Coupe ( 2 doors ) and it idles high then low when I start it. It takes a while before it stops doing it, around 5 to then minutes. Moreover, I have this problem too that when I drive the car, around 30-40 mph, the engine turns to 2500 rpm and it comes to 3000 rpm before it goes down. 
Anyone can help me ?

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  • Gab_O_o Jun 08, 2008

    I'll try it as soon as I have the time, I will post later on!


    Thank you very much 

  • Gab_O_o Jun 09, 2008

    Hi, I've tried to adjust that Fast Idle Thermo Valve and it didn't solve the problem of idling high then low. The valve seems to work well, I could sense an air flow going through it and when the engine became hot, the air flow stopped, wich is normal.


    It seems then that the problem is somewhere else. Could anyone help me !?


    Thank you very much !

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)The fact that thge engine idle fluctuates when it is cold indicates that the Fast Idle THermo Valve is out of adjustment.
This valve is located ot the front of the intake manifold on the driver's side just below the accelerator cable. To adjust it, wait until the engine is cold (best to do it first thing in the morning).
Remove the two screws holding the cover on and start the engine. There is a brass needle sticking up through a plastic ring that has two slots in it. With the engine idle fluctuating, use a thin flat blade screwdriver to SLOWLY turn the ring CLOCKWISE
until the idle stabilizes. Once done. put the cover back on withg the two screws and you should be done.

Posted on Jun 05, 2008

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Posted on Jan 02, 2017

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