Question about 1990 Honda Prelude

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1990 2.1 engine swap

After replacing my engine with one that was the same year, except it came from a car with an automatic trans. It started on the first crank but it idles @ 3500RPM and the temp rises to hot in 3-5 minutes. I have not installed exhaust yet would that have anything to do with it? Help me please.

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I know you have checked and checked but you have a bad vacuum leak. Like power break vacuum line. It will be a big leak..

Posted on Sep 24, 2008

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Well, the engine requires backpressure and a ventway for the exhaust; however it shouldn't be causing that.

The temp is explained simply by the speed of the engine, that's a really high RPM for no load and it's gonna head up quickly. Try seeing if you can adjust the throttle itself and see if that's incorrect somehow. I'm not sure on the prelude but I believe the cable is adjustable.

The only things holding the engine from going to such an RPM is the throttle itself. If it's opened to far the RPM will rise by giving the engine more air/fuel through the intake. So make sure that throttle is closing. I believe it should just about be completely shut on that car. I think it's only about 1/8th inch gap or somewhere close to that. I'm not positive on that and you'll have to work with it to find it.

If you can't adjust your cable, try disconnecting the cable completely and see if the throttle closes. If so the RPM should go down to an idle or somewhere close for you. Hope this helps bud!

Posted on Sep 24, 2008

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