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28-07-16, 10:24 PM | #1 | |
Senior Member
Classic Audi Club Member
Join Date: Apr 2008
Posts: 1,326
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Idle Stabilization Valve - Advice please
Greetings all,
If I replace the ISV on my engine, can I simply fit it without the need for equipment to adjust the idle setting? A straight swap of new for old..... I have a KU 5 pot on my C3. |
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29-07-16, 11:19 AM | #2 |
Grown up member
Classic Audi Club Member
Join Date: Feb 2011
Posts: 239
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That depends on whether anyone has messed with the engine while the ISV has been in a defective condition. Commonly as they fail the revs tend to run gradually higher and the user screws in the idle screw to reduce the air being allowed to bypass the throttle butterfly, once they have it all the way in they start messing with the mixture screw leaning it off to reduce the RPM.
Fit a new one and see what happens. Ideally it should run with 430 milliamps throught the ISV at 820 rpm and a mixture in the order of 1% CO.
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Roger Galvin Chairman & Technical Secretary, qOC quattro Workshop |
29-07-16, 01:05 PM | #3 |
Grown up member
Join Date: Jan 2014
Posts: 218
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You make it sound so easy Roger...
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