Erratic idle - Hyundai Elantra Forum
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post #1 of 2 (permalink) Old 10-23-2014, 11:30 AM Thread Starter
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Erratic idle

I just picked up an 02 Hyundai elantra manual trans that needed a transmission. ran fine before I replaced transmission but after putting it all back together the car now how has an erratic idle. it will rev from 2-4000 rpms. I tried spraying for vacuum leaks idle didn't pick up any higher. replaced tps and iac and didn't make a difference. the only thing that did make any difference is unplugging map sensor. dropped idle to about 1200 rpm but ran rough. could this affect the idle or does anybody have any other ideas im at a loss with this one.
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post #2 of 2 (permalink) Old 11-10-2014, 10:47 PM
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Could be a lean fuel condition due to a vacuum leak in the the intake manifold
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