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Fixing Idle on a 1991 Honda Prelude
The idle constantly runs up and down on my Prelude. It'll start at 1000 RPM, rev to 2000 RPM, stop gas flow, run back down to 1000 RPM, and then repeat the process.
How can I fix this?
Also, My speedometor doesnt work. What could be causing the problem there?
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what's happening here is prolly two things. one of the two rather. what you're gonna wanna do is remove your intake manifold. yes the whole thing. once that's off you'll look down into your engine and below the engine is the transmission. now follow the wires down to the tranny. there will be three wires (these are the speedometer wires) they make the speedo work, and they also manage your idle intake valve. and make it so the car can idle proper. what prolly has happened is over time the valve has gotten warped, dirty, and no longer connected or no longer staying open to the right amount. that might be your main culprit.
another culprit might just be your intake manifold itself. yup the thing you have to take off to get to the idler valve. well this little bad boy could be dirty, filthy, grungy, and sending in too much fuel making you run too rich and idle too high and be all jumpy. what you do is get a metal baking pan, fill it with carubretor cleaner, and place the whole manifold in the pan and scrub it down good. then let it dry and slap it back on. i'd also get in there and change the fuel lines, fuel pump, and fuel filter. once you've taken care of all that, get back to me, i guarantee things'll be better.
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Check you idle pulley or throttle body. And for the speedometer check the wiring harnesses in the back or your going to have to go to like a junk yard and find one or something..
Good Luck!
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