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Where is the idle adjustment screw?

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Old 03-06-2004, 01:21 AM
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Aleks951
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Default Where is the idle adjustment screw?

My 951 is currently idling at about 1200 rpms once it is warmed up. I don't recall the idle being "that" high before I installed my test pipe. Is it possible that due to the reduced backpressure, the idle speed would increase?

I tried searching all over for idle adjustment and I found quite a few good threads but I still don't know for sure where the actual idle adjustment screw is on the throttle body.

I took a picture so if anyone would help me out I'd really appreciate it. I'd like to start doing more work on my own car.


Thanks for the help!
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Old 03-06-2004, 01:27 AM
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jdog
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It is where that blob of chewing gum is on top of the throttle body.People put stuff like that on there to keep them from backing out. I believe there is a prod. for adj. that. I don't think you can just "turn" it to get the correct curb idle.
JR
Old 03-06-2004, 01:33 AM
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Aleks951
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Thanks jdog that's where I thought it was but I wanted to be sure. I am going to follow the procedure to adjust the idle on Clark's Garage web page. I will jumper the "B" and "C" ports on the diagnostic plug in order to defeat the idle stabilizer. Then I'll check/adjust the idle.

Is there something I'm missing?
Old 03-06-2004, 09:25 AM
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Chas
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In the winter I have to turn the screw a bit when it gets really cold, and it seems to help. I turn it back when it warms up....seems to work great
Old 03-06-2004, 03:30 PM
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Crazy Eddie

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jdog
You are right on. A few years ago I heard a sucking sound, I didn't know WTF it
was Truned out that screw backed out and was lost. I neve thougt of doing that....
Ed
Old 03-07-2004, 03:21 AM
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Aleks951
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Ok, so I set the idle at about 900 rpm after the car was all warmed up. It seemed like even with that black tar-like stuff on it the screw was waaaaay out. I think I had to turn it IN about 3-5 complete turns to get it about right. However, it may have kept it from backing all the way out and dropping out.

Do you know where I can find that stuff? Is it as easy to find as going to Pep Boys, Autozone, etc., etc.?
Old 03-07-2004, 03:39 AM
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Bri Bro
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Aleks951
Drop me a line and I can supply you with all the .jpg picture showing how do this correctly.

1) Get the correct screw and O ring. The black stuff isn't correct.
2) Disable the DME idle control to set the base idle RPM.
3) Set Idle to 840 +/- 40 RPM.

Last edited by Bri Bro; 03-07-2004 at 03:59 PM.
Old 03-07-2004, 11:18 AM
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Aleks951
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Thanks Brian. You've got mail!
Old 03-07-2004, 03:42 PM
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djazzy99
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hey guys,
do you know what the idle is supposed to be on these cars one they are warm, on lets say a normal summer day? mine idles at about 1000-1100, and the screw is all the way in. mine came with some silicone on top of the screw to make sure it didnt back its way out too.
Old 03-07-2004, 03:58 PM
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Bri Bro
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Warm engine, 840 +/- 40 RPM.
Old 03-07-2004, 04:08 PM
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djazzy99
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thank you beab 951.
Old 04-01-2004, 05:41 PM
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Chas
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Where is the diagnostic plug (the one where you jumper port B and C) located???
Old 04-01-2004, 06:03 PM
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Aleks951
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against the left fender behind the coolant tank under a black plastic cover.
Old 04-01-2004, 06:08 PM
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NZ951
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Defeat your ISV by throwing it in the bin...
Old 04-01-2004, 06:31 PM
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Chas
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cool, anyone have a pic by chance?


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