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Need to check vaccum lines a bad throttle position sensor bad map sensor or any other number of things could be wrong with it. You may need to take it to a shop and have them diagnose it with a scanner in order to get the proper diagnosis.

1986-1989 Honda Accord with Carburetor have a very bad habit that is little known even by most mechanics but easily fixed at home. The vacuum port on the choke opener that is connected to the intake manifold and both vacuum ports on the fast idle unloader get plugged up with nasty hard carbon almost as hard as metal. When this happens the choke sticks closed and the idle sticks on fast idle when the engine is cold and nobody can figure out why. All you have to do is attach a small drill bit to the end of a flexible socket-driver extension and put it in a variable speed drill that will let you run it real slow and carefully drill out the vacuum ports that are plugged. After they are nice and clean use a vacuum pump tester to make sure the choke opener and fast idle unloader are working before putting it all back together.

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โˆ™ 2015-07-15 20:53:57
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Q: How do you fix the high idle on a 1989 Honda Accord?
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