My idle go up and down
I had the sme problem with my 1992 prelude si. The problem with mine was that the intake manifold gasket was leaking horribly. The idle would go up and down just setting there, but when I held the brake long enough it stopped. An easy way to see if it is the gasket is get WD40 or Brakleen or soemthing like that, and spary it where the intake manifols bolts to the block. If you hear a change in the idle speed (faster or slower) just change out the gasket.
Hi you are going to need an idle air control motor. This motor/sensor is what holds your idle at the correct rpm at idle.
SOURCE: 1991 honda prelude speedometer not working,what is
your cable is either broken or can loose on your trans axle or behind your instrument cluster. Check those first. cost ????? not sure
SOURCE: my idle needs to be turned down on my 1986 honda
Look for a hole about 11mm diameter on the throttle body with a brass colored, slotted plug in it. Turning the plug/screw clockwise with a flat tipped screwdriver should turn down the idle speed.
Testimonial: "thank you your advice was right on I used ure advice and found that the scew was messed up. so I had to replace after replacement It worked fine."
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85 Honda prelude si
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