automatic RPM kick down when cold on Series II - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-06-2004, 01:39 PM   #1
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Default automatic RPM kick down when cold on Series II

Whenever I start my 99 on a cool morning (less than 40 degrees) the engine revs at 1500 RPMs. The higher RPMs on the initial start are to be expected, however, it will stay reved at 1500 RPMs indefinitely unless you tap the gas or put the car in gear. It acts very much like an old carberauted engine with a choke. Is this common on the Series II engines or do I need to do something to stop this from happening??
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Old 01-06-2004, 03:48 PM   #2
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Vital, I think my SSEi does the same. Not really sure, as I don't leave it idling that long.
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Old 01-06-2004, 05:36 PM   #3
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Default Re: automatic RPM kick down when cold on Series II

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Originally Posted by vital49
Whenever I start my 99 on a cool morning (less than 40 degrees) the engine revs at 1500 RPMs. The higher RPMs on the initial start are to be expected, however, it will stay reved at 1500 RPMs indefinitely unless you tap the gas or put the car in gear. It acts very much like an old carberauted engine with a choke. Is this common on the Series II engines or do I need to do something to stop this from happening??

Mine does that as well. Strange.
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Old 01-06-2004, 05:44 PM   #4
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That'* just the startup, every car i've started and not used right away does this. Helps warm up, keep the alt running good to charge the battery etc as far as I can tell. With my stereo pushing hard, my alt dips down in voltage a little at warm idle, but @ 1500 it doesn't dip at all.
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Old 01-06-2004, 09:33 PM   #5
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It sounds normal to me - The computer is programmed to keep the idle higher at startup.
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Old 01-07-2004, 11:29 AM   #6
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Thanks for the replies. I was just curious because my 93 doesn't do it for longer than 10 seconds. Nor does my Cavalier. Must be a Series II thing!!
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Old 01-07-2004, 01:02 PM   #7
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My 93 does it, it seems to have a multi-stage system. It starts out very high, and then like you said after 10 seconds it may drop some, but not a low. Maybe like 100-200 RPMS. Once i get in the gas enough, or start driving it'll go down. It'* generally still at warm up on mine when i'm done backing up.
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Old 01-07-2004, 03:00 PM   #8
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my vette idles at 2500 on cold start, and with the sidepipes its pretty freakin loud. so i tend not to notice high idle on and quiet cars
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Old 01-08-2004, 03:28 AM   #9
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Mine also does idles at 1500 rpm cold, but after it has warmed to about 160 degrees, the engine will throttle itself down to the normal 800-900 rpm idle. I don't know if this is consistent, but I just tried it today. Normally I don't even let it idle long enough to find out.
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Old 01-08-2004, 08:22 AM   #10
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Quote:
Originally Posted by StoopidSavant
Mine also does idles at 1500 rpm cold, but after it has warmed to about 160 degrees, the engine will throttle itself down to the normal 800-900 rpm idle. I don't know if this is consistent, but I just tried it today. Normally I don't even let it idle long enough to find out.
I tried it today too. It was 6 F out and after 6 minutes it was still at 1,500rpm.

Jay
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