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Old 04-09-2008, 01:58 PM   #1 (permalink)
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Default High idle on cold start up, hesitation, etc....

Now I've read that huge thread about these problems... but I cannot figure this out!!

On a cold start up, it idles around 2000rpm. After about 1 minute, it drops to 1500rpm. After a few minutes, it goes to 1000rpm, won't go any lower then that. I pulled out my ISC (IAC), only to realize it's already the new model ISC and that it looked clean as a whistle, like the previous owner had changed it. Opened up my MAF. That looked clean too. Changed my spark plugs and wires. Accidentally forgot to hook up the ground wire on the back of the intake plenium, but the car would sometimes idle normal, but then it would jump up and down and sometimes stall out. When I hooked the ground wire back to the intake plenium I was back to my original idle problems. There is sometimes hesitation under 3000rpm, mostly when car isn't fully warmed up.

Oh, and it's "normal" idle is around 1000rpm, even though it is supposed to be 700rpm.

What else could it be?
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Old 04-09-2008, 02:17 PM   #2 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

Do you have a logger to check your IAC count?

If not, have you checked your BISS to see if it's in the correct position? It could be too far out.
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Old 04-09-2008, 02:20 PM   #3 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

No, I don't have a logger to check my IAC. I pulled it out and it looks like that thing is brand new! Where is the BISS at anyway. I cannot find any pictures showing what it looks like.
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Old 04-09-2008, 02:24 PM   #4 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

It's right on your throttle body, should have a cap over it. It faces up and at an angle forward. Can't find a pic at the moment.
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Old 04-09-2008, 02:36 PM   #5 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

Okay, now that I know it's on the throttle body I should be able to find it. Which way should I turn it? And should I turn it with the car on or off?
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Old 04-09-2008, 02:38 PM   #6 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

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Okay, now that I know it's on the throttle body I should be able to find it. Which way should I turn it? And should I turn it with the car on or off?
It works in conjunction with your IAC to control the idle speed of the car.

Wait for the car to finish warming up, then turn it in or out until you're sitting at 750rpm. That's the stock idle speed, and where you should be idling at - the car will be happy to be back to there.

Unless you have a vac. leak / some other problem which could increase idle speed independently of the BISS / IAC system.
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Old 04-09-2008, 02:47 PM   #7 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

How do you find out if you have a vac leak?
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Old 04-09-2008, 02:49 PM   #8 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

Hmm. On an N/A I am not sure. The usual solution is to spray soapy water on your intake pipes / vac lines and look for bubbles. I would just at the least visually inspect everything, including the MAS mesh, make sure everything is plugged in, then go from there.
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Old 04-09-2008, 02:54 PM   #9 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

I kinda did an overview of everything the other day when I changed my plugs and wires. Everything looked good. Everything was connected.
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Old 04-09-2008, 08:03 PM   #10 (permalink)
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Default Re: High idle on cold start up, hesitation, etc....

So I got my car to idle at 750, however after I take off and drive for a minute, next time I am at a light, it gets low to about 500-600rpm, then it tries to jump up to 900rpm, and sometimes it goes back to 750. What the hell is my car doing?
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