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Old 27 Oct 2011, 06:01 pm
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Default 93 honda prelude, High Idle?

My prelude idles high at about 2000 rpm. i adjusted the idle screw and even unloosen the throttle cable a little bit and it dropped to 1500 rpm and it wont drop any further, and suggestions? Also I today I noticed a little bit of oil spraying out of the muffler, what could that be? Thanks..
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Old 27 Oct 2011, 06:16 pm
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The pre '96 cars had vacuum control of a lot of systems which newer cars now have controlled via the ECU - Engine Control Unit.































The vacuum comes from the inlet manifold where a depression exists.































The rubber tubes that carry the vacuum to the various switches will rot, crack and break. The high idle is due to a vacuum leak from one or more of these tubes. This then takes air into the engine without passing through the correct air intake system and everything adjusts to take account of a weaker air/fuel mixture by adding more fuel and this leads to higher revs.































Open the hood/bonnet and listen for a hiss sound and track it down. Replace the tubing.































With older cars as well it is possible for the diaphragm in some of the control units to leak as well.































Have fun, there are a lot of vacuum pipes on those cars.
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