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Old 14 Apr 2011, 10:46 pm
C.O C.O is offline
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Default Help! Coolant Temp Sensor or PCM Ground? 1989 Honda Prelude?

I have a 1989 Honda Prelude 2.0 SOHC with all kinds of little problems, but one sticks out that I am trying to tackle.

When I start my car after it's been sitting overnight, it runs very rich. I can smell the richness of the fuel in the exhaust and it chugs (Misfires) for a few min. After about 3 min of this the RPM's shoot up to about 2500 and stops misfiring. This lasts about 5 min and the RPM's drop back down and car runs fine.

Also after it's been running for a while (driving around town) I will turn it off and go into a store, I come back ten min later and it has a hard time starting when hot.

I have been doing research and I've come to think it might be the Coolant Temp Sensor based on the symptoms. I also had a Honda guy tell me it might be a bad ground at the PCM, and I have no idea how to fix that. Any ideas? I know this is a long description but and help is appreciated. oh yeah and my last gear does not engage it seems like. I am going down the highway at 65 mph and my RPM's are over 3000, and I'm pretty sure that's bogus.

I have recently done a fuel system cleaning, new plugs , distributor cap, rotor and wires. There is no check engine light. 189K
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Old 14 Apr 2011, 11:01 pm
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ITS AMAZING I like this one.

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Old 14 Apr 2011, 11:16 pm
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its an old model right?

Check fuel over flow system. If the injecter hold more fuel it causes missfire and black smoke with the smell.

You might need to tune the ignition.
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