Archive for 1987 to 1991 Honda Civic Sedan Owners Club
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EFfin Sedan 91

Bouncing idle after MPFI swap

Finished my mpfi swap the other day and finally got it running somewhat decently except when it idles, it bounces up and down from 1000-1500 and doesnt stop even when warm. I've read that it could be a million different things from air in the coolant to a bad tps sensor. Does anyone here have any experience with this? I need to get my car back up to a drivable state ASAP. Any help is greatly appreciated!

My idle bounced like that when I had a vacuum leak. You should check that first unless you have a cel for tps. Forum Index -> Write Ups & Tech Info
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