Passed all smog tests except it idles at 1100rpm, tech says it should be 800 to 850 rpm.
Start spraying carb cleaner around the intake and listen for rpm drop.
SOURCE: 1989 Honda prelude speedo doesn't
sounds likle you have eithor vehicle speed sensor not working or the cable behind the dash is not connected or loose check the speed sensor it is on the transmission outside the tranny maybe it has come loose or is broken worn out hope this helps
SOURCE: 1989 honda prelude
if you are somewhat mechanically inclined you should be able to follow these steps in order I put them. #1 Disconnect the negative battery terminal.#2 Disconnect the electrical terminals from the alternator.#3 Loosen the alternator adjustment and pivot bolts and remove the belt.#4 Remove the bolts and separate the alternator from the engine.#5 Remove the alternator bracket from engine.#6 Remove the fuel filter and any of the vacuum lines in the way.#7 Remove alternator from top of the car.#8 Installation is reverse of removal.
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.
SOURCE: 1989 honda prelude. engine surges. from normal to 2100 rpms
There is a warm up valve on the throttle body(should have 2 small coolant hoses). remove the valve and have someone start the car while you block the port to the valve on the intake. If that clears up the problem you can cut a piece of cardboard to mount in between the valve and intake.should straighten it out.
SOURCE: How much should it cost to reset computer in a
Auto zone can run a code reader on the vehicle for free,just ask them to clear the codes for you,normaly the light will go off on it`s own,if that was the problem
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