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petervankleeck · 03-16-2019

I have a 1990 ZR1 (0659 – 63,000 miles) that revs up to 4k at start and in about 1 minute settles down at 2.5k. The engine does not sound like it is running at that RPM but that’s what the tach says. After driving it for a while it will idle at 4k but sometimes it remains up at driving speed RPMs. Most of the time, if I turn it off at a light, it will idle down to 4k (not sure it’s 4k by the sound). It starts right up. I’ve read enough of the posts to see that idle is almost 100% attributed to vacuum leak but your numbers are under 2k RPM. Without your foot on the pedal it drives smoothly right along. I purchased a membership with the hopes of getting some help. Thanks.

03-16-2019	#1
petervankleeck Join Date: Mar 2019 Location: Manassas, VA Posts: 25	Extremely High Idle I have a 1990 ZR1 (0659 – 63,000 miles) that revs up to 4k at start and in about 1 minute settles down at 2.5k. The engine does not sound like it is running at that RPM but that’s what the tach says. After driving it for a while it will idle at 4k but sometimes it remains up at driving speed RPMs. Most of the time, if I turn it off at a light, it will idle down to 4k (not sure it’s 4k by the sound). It starts right up. I’ve read enough of the posts to see that idle is almost 100% attributed to vacuum leak but your numbers are under 2k RPM. Without your foot on the pedal it drives smoothly right along. I purchased a membership with the hopes of getting some help. Thanks.