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 Post subject: High idle when cold
PostPosted: Sat Nov 03, 2012 10:03 am 
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Joined: Sat Sep 01, 2012 10:35 pm
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Location: Winnipeg, Canada
Year and Trim: 2000 SE
Hey guys

I've been noticing lately (with the weather getting cooler) that my engine's cold idle seems on the high side (1300-1400 rpm). Once warm it's OK, around 700-800 rpm. I know there is no manual idle adjustment, but can anybody suggest what could be causing it to idle this high? The IAC is clean (I clean it often) so it's not that. Maybe the TPS is going bad?


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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 12:28 pm 
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Location: Sycamore, IL
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1997 'maro (3.8L M5)
89 SkiDoo
It runs high till the engine starts to warm up. It's normal.

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00Beast wrote:
Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.


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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 1:23 pm 
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Year and Trim: 2001 SE
Yup, normal for pretty much all GM vehicles. When you think about it, it must cause more wear on a engine, especially if it has sat for a while. One of the reasons I removed this function with tuning from my camaro.


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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 1:28 pm 
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Joined: Fri Apr 06, 2012 7:37 pm
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Year and Trim: 1999 Pontiac Bonneville SE
1997 Pontiac Firebird
Have the same prob. I posted a while ago. I changed the o2 sensor and there was no significant change besides a smother "warm" idle.

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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 2:09 pm 
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Location: Sycamore, IL
Year and Trim: 05 Chevy 'Hoe
1997 'maro (3.8L M5)
89 SkiDoo
All engine do it. It's basically like a choking for a carb'd engine.

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00Beast wrote:
Less off-topic than Lane's Heated Steering wheel, but yeah, back to the topic.


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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 6:54 pm 
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Location: Winnipeg, Canada
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I understand that any engine idles higer when cold...but that high? My previous car was an '05 Grand Am and it cold idled around 1000-1100 rpm.


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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 7:02 pm 
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Location: New York, NY
Year and Trim: 2000 Pontiac Bonneville SLE
This is normal. Mine does the same. Once a certain temp is reached, it drops back down. First time i ever noticed it, talked to a GM mechanic and even he explained the whole thing to me on why it does it. Don't remember why anymore, but I remember that it is normal.


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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 8:21 pm 
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Location: Western New York
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I just rev the engine a lil bit and the idle drops down right away.

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 Post subject: Re: High idle when cold
PostPosted: Sat Nov 03, 2012 8:48 pm 
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dz09x wrote:
This is normal. Mine does the same. Once a certain temp is reached, it drops back down. First time i ever noticed it, talked to a GM mechanic and even he explained the whole thing to me on why it does it. Don't remember why anymore, but I remember that it is normal.


I believe gm made the cars rev higher to heat the O2 sensor quicker as in older cars before heated sensors. The O2 needed to reach a certain temp. to measure properly. It was also to help bring the catalitic converter up to temp quicker as it does not really work until it reaches a certain temperature. It was basically all for emissions. In the newer cars it must mostly serve to heat up the catalyst faster as the O2's are heated. I'm sure it serves some other purpose to but that's the main one. Most cars will idle around 1500rpm's until coolant reaches a certain temp. If its a lot lower than this and no tuning has been done to the car. Then you probably have a problem with your IAC motor.


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 Post subject: Re: High idle when cold
PostPosted: Sun Nov 04, 2012 1:17 pm 
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Location: Winnipeg, Canada
Year and Trim: 2000 SE
OK, so it is normal. Good to know...thanks guys!


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