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Join Date: Apr 2004
Location: Chicago
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Need an Idle Speed Valve

im sick and tired of the rpm going all over the place. Im quite sure its the ISV cuz if i smack it the rpms go to normal. Anyone have one for sale. Whats invovled in installing a new one.
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Old 04-12-2005, 01:19 PM
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Im assuming your talking about the cold start valve? If it gets stuck open then your RPMS will rise, Anyway, I think you will need to remove the intake manifold since it is located under there. Other than that its not really hard at all.
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Old 04-12-2005, 01:28 PM
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You have to jumper between pin B and C on the diagnostics plug before you set your idle. Otherwise it just wanders all over the place.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
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Old 04-12-2005, 04:20 PM
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SoCal I tired the bypass...it simply doesn't work. I jumpered the B and C like Clarks Garage sugggests but it does diddly squat...is there another way to jumper it.
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88 928 S4 Black, Black and Grey Interior
Alpine head unit & amp, Bazooka Tube, Viper 5704 Smart Start GPS tracking, Devek Headers, Flowmaster 40 3" with Resonator, Auto Authority chips. Custom Luggage Cover.

Traded - 86 944 Turbo Guards Red. RIP - 85.5 944 Guards Red
Old 04-12-2005, 09:49 PM
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How did you adjust the idle after you jumpered between B and C?

Anyway, since you can hit the idle control valve you know it's under the intake. Some find it necessary to remove the intake to get to the valve. Others have reported they have R&R'd the valve with the intake on.

Once you get it off just give it a good soaking with PB Blaster then Carb cleaner. Check all of the vacuum lines before you put it back on.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!

Last edited by SoCal Driver; 04-13-2005 at 06:51 AM..
Old 04-13-2005, 06:48 AM
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And you might want to replace the o-ring on the idle bypass screw.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 04-13-2005, 06:53 AM
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After jumping the B&C terminals...I adjusted the idle using the idle screw on top of the throttle body as depicted in clarks garage. But it doesnt do much as far as helping at all cuz eventually the ****in thing goes back to 2k rpm. I'm ready to drive this thing into a wall.

WTF is the idle bypass screw...is that the same as the idle adjuster screw
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88 928 S4 Black, Black and Grey Interior
Alpine head unit & amp, Bazooka Tube, Viper 5704 Smart Start GPS tracking, Devek Headers, Flowmaster 40 3" with Resonator, Auto Authority chips. Custom Luggage Cover.

Traded - 86 944 Turbo Guards Red. RIP - 85.5 944 Guards Red
Old 04-13-2005, 10:19 AM
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Yeap.

Check the setting for the TPS. Which trottle body is this?
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 04-13-2005, 03:43 PM
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um 85.5 na throttle body...well i ordered the idle speed valve should get here by friday...thanks for ur help
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88 928 S4 Black, Black and Grey Interior
Alpine head unit & amp, Bazooka Tube, Viper 5704 Smart Start GPS tracking, Devek Headers, Flowmaster 40 3" with Resonator, Auto Authority chips. Custom Luggage Cover.

Traded - 86 944 Turbo Guards Red. RIP - 85.5 944 Guards Red
Old 04-13-2005, 03:57 PM
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May be the DME.
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Hugh - So Cal 83 944 Driver Person
NOT a 'real' Porsche -- Its Better!!!!
When was the last time you changed your timing and balance belts and/or cam chain and tensioner?
New Users please add your car's year and model to your signature line!
Never break more than you fix!
Old 04-13-2005, 04:06 PM
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