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Old 03-18-2015, 03:25 AM   #1
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Low idle 24/7

My car idols at around 550 whenever I'm stopped at a red light or start it warm. The only time my car idles differently is when I start it cold, then the idol starts high (over 1k) and lowers slowly. Any ideas why my car is doing this? Is there something I need to adjust? Thanks in advance. 2001 3.8 auto 181,500 miles


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Old 03-18-2015, 10:42 AM   #2
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That's normal.


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Old 03-18-2015, 11:20 AM   #3
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Low idle 24/7

I've never had a car idle at almost 500 on a daily basis. It use to idle at 750


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Old 03-18-2015, 11:31 AM   #4
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Have you changed oil weight? And at start up it should go up past a little bit over 1k then after give or take 30 seconds it should down around 600-800 wich a safe range and 550 not far off so I really wouldn't worry about it.


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Old 03-18-2015, 11:48 AM   #5
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I started using high mileage oil but even before that it did the same thing. It just feels weird seeing my tac at almost 500 every time I stop


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Old 03-20-2015, 03:34 PM   #6
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After changing my idle pulley it idles normally again so far. It was pretty worn out.


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Old 03-20-2015, 03:54 PM   #7
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High idle @ cold start is intended. Car runs in open loop fuel mode (i.e. running rich) before reaching operating temperature, so pulls in more air momentarily.

You can always do the idle relearn strategy (what I do after loading a new custom tune or between cold and hot seasons). I personally use my SCT to reset my KAM memory but if you don't have one you can do the following to obtain optimal idle quality:

Disconnect battery > let sit for a while > reconnect >start car w/o AC on, let it idle until it reaches operating temp (watch the gauge on the dash) usually takes 5-10 min > let it idle for 1 minute at operating temp > turn on AC, let idle for 1 min > done, now do normal driving to relearn the rest.
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Old 03-20-2015, 04:09 PM   #8
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Quote:
Originally Posted by 2 Stangz View Post
High idle @ cold start is intended. Car runs in open loop fuel mode (i.e. running rich) before reaching operating temperature, so pulls in more air momentarily.

You can always do the idle relearn strategy (what I do after loading a new custom tune or between cold and hot seasons). I personally use my SCT to reset my KAM memory but if you don't have one you can do the following to obtain optimal idle quality:

Disconnect battery > let sit for a while > reconnect >start car w/o AC on, let it idle until it reaches operating temp (watch the gauge on the dash) usually takes 5-10 min > let it idle for 1 minute at operating temp > turn on AC, let idle for 1 min > done, now do normal driving to relearn the rest.

I didn't know you could do this, thanks. Will keep this in mind.


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