Idle jumps at start, need advice.
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Joined: Jul 2000
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Idle jumps at start, need advice.
Ever since I installed a GM ported throttle body, a cold start produces about 2100 rpms for about 3 seconds before the normal idle kicks in. I've heard that most of an engine's wear happens at start-up. Is 2100 rpm too high for a cold engine to see for the first few seconds? What should be normal? 1300-1500 rpms?
Pro
Joined: Mar 2001
Posts: 512
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From: Greensboro NC
Re: Idle jumps at start, need advice. (turboo2u)
Idle at startup is determined by intake air temp IAT, so your idle will depend on the temp, however, 2100 is too high regardless. In fact, 1300-1500 is too high also. I don't recall what idle is for mine at startup on a cold day, but I don't recall it being that high.
Ever since I installed a GM ported throttle body, a cold start produces about 2100 rpms for about 3 seconds before the normal idle kicks in. I've heard that most of an engine's wear happens at start-up. Is 2100 rpm too high for a cold engine to see for the first few seconds? What should be normal? 1300-1500 rpms?
