S2000 Under The Hood S2000 Technical and Mechanical discussions.

idle goes down like engine id going to die...

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Old Apr 5, 2008 | 04:49 PM
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Default idle goes down like engine id going to die...

hi guys is it normal that when you drvie normaly and you remove your pedal on thhe gas your engine goes dowm up to 600plus rpm and your oil pressure goes down up to 38psi then suddenly right after going down it goes up to 800-900plus rpm thats 49-50ps and maintains the 800-900lus rpm and 49-50psi oil presure is this normal or is my throtle body dirty already?? or my sensors... it feels like that the engine is going to die when ou release your foot on the gas pedal..... most specialy with the aircon off.... pls help me guys! thanks so much!
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Old Apr 5, 2008 | 08:51 PM
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hi guys pls help me!! pls pls pls pls.......
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Old Apr 6, 2008 | 06:49 PM
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pls guys help me with this one thanks!!!
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Old Apr 6, 2008 | 07:41 PM
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Originally Posted by pinoyk20,Apr 5 2008, 07:49 PM
hi guys is it normal that when you drvie normaly and you remove your pedal on thhe gas your engine goes dowm up to 600plus rpm and your oil pressure goes down up to 38psi then suddenly right after going down it goes up to 800-900plus rpm thats 49-50ps and maintains the 800-900lus rpm and 49-50psi oil presure is this normal or is my throtle body dirty already?? or my sensors... it feels like that the engine is going to die when ou release your foot on the gas pedal..... most specialy with the aircon off.... pls help me guys! thanks so much!
Possible Throttle Position Sensor issue. I've never done this on the S2k, but on other cars.

Might also be a good time to as you had said, clean out your throttle body (especially if you find it dirty or have a sticky throttle valve)
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Old Apr 6, 2008 | 09:03 PM
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try an ecm idle learn procedure
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Old Apr 6, 2008 | 09:41 PM
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oh how do you do it??? thanks!
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Old Apr 7, 2008 | 11:35 AM
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how long has it been going on? Sometimes the ECU just needs to relearn what to do.
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Old Apr 7, 2008 | 01:12 PM
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From: THE LAKE DISTRICT BABY!!
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Originally Posted by pinoyk20,Apr 7 2008, 06:41 AM
oh how do you do it??? thanks!
Get the car warm then park up. Switch the car off and pull the ECU fuse shown below for about 10 mins (this removes power to the ECU) Replace it, start the car up then go and find a long stretch of road and give it redline through the gears. The ECU will quickly learn where to set its fuelling and ignition timing. The next step is to get the idle sorted. You will notice the car really struggles to idle and cuts out. To relearn, park up and let the car go through 3 cycles of the cooling fan coming on and off. its then set. It will eventaully learn anyway, but its quicker using the cooling fan method.

Fuse can be found behind the fuse cover inside the footwell:



Or remove the negative battery terminal and wait for 10 mins

Copied from s2kuk faq
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