start up idle,very high
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Instructor
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From: Florida
start up idle,very high
2021 C-8 What is cold start up idle RPM's suppose to be ?? Mine 1600 sounds very high . Computer reset? Thanks
Last edited by vicvette; Feb 19, 2021 at 10:28 AM.
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1,500 to 1,600 on cold start, initial idle is normal. Your ECU richens the mixture to help it run properly and warm up. Most modern cars do this. Think of it like a choke on an older carbeurated car. The idle settles down after a short period of time.
Pro
Joined: Jan 2017
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The high idle is 100% to light the cat during the warm-up cycle, which is the highest pollution event during normal operation.. There is no other reason for it. GM explains this in a tech bulletin that I do not have with me.
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Pretty normal and would only last you for about a minute or less, if that stays longer than that then there could be a problem
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