I have a 1990 prelude and i got big proble with it.
If I start the car the stays high already even im not touching the pedal
and the nxt thing is the goes up ang down if its in park but if I go put it in drive sound is gone...just like smooth i cant figure it out what is wrong with my car...pls help me....
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you might check your adjustment on your clutch is sound that its not releasing right check your pedal freplay should not more than 1 inch or snycho in your transmission is already causing it not to apply in those gears which you may end up by rebuilding your tranny of buy a new one..
This problem is a little bit hard to coz you need to check the following throttle body, fast idle valve & the IACV valve. First the throttle body it must fully closed during idle and the TP sensor voltage must be 0.5 volt. The fast idle valve is wax type there is a 2 small hose pass below of this valve, if the coolant water is not circulating the valve will not closed. You can check it by touching the lower portion of this valve after 1 min. Regarding the IACV you can check if this is the fault by removing the hose connecting the throttle body and air filter. there is 2 small hole near the opening of the throttle body, while the engine is running at idle close one by one and see which one cause this problem.I hope this will give help to your problem.