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Idle Speed Problem

 
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Old 05-04-2008, 10:58 PM
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Idle Speed Problem

I recently purchased a 1999 Prelude. When the car is rolling, even with the clutch/transmission not engaged, the engine races up to around 3000 rpm. It will drop down to about 700 rpms when the car stops moving.

For example, I stopped at the top of the hill, the engine de-accelerated to around 750 rpms. With the car in Neutral, I let off the brake. As soon as the car started to roll forward, the engine began to climb to 3000 rpms.
Likewise, as soon as I engage the clutch in first gear and the car begins forward motion, the engine begins to idle rapidly.

This car has been converted from an auto to a manual transmission. The ECU was replaced by the previous owner with one designed for a manual transmission. The car's suspension has been lowered.
My local Honda shop won't touch the car because of modifications.

Any suggestions?
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Old 05-05-2008, 04:51 PM
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t3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these partst3am 83rd is infamous around these parts
Maybe the previous owner didnt really replace the ECU, my friends car had the same problem when he did the auto to manual swap, it was the ECU.
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Old 05-05-2008, 05:25 PM
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ECU question

I was on another forum and it showed how to convert an automatic to a manual by moving a resistor to a new location. When I took the ECU apart, the resistor mentioned was already in the manual position, so I've assumed the ECU was replaced. Maybe I was wrong.

I Think I will try to swap the resistor in the reverse of what was mentioned. Perhaps it will solve my problem.

I'm hoping I don't have to switch the ECU because I don't have the security key to reprogram the lock-out function.

Thanks.
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