What exactly is the coolant circulation through the ISCV for?
#1
What exactly is the coolant circulation through the ISCV for?
Is the coolant circulation through the bottom of the ISCV purely to prevent icing up or is there something else? Mine was bypassed when I did the throttle body a while back but I'm now wondering if I did the right thing...
#2
Dean
#4
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Something Ive learned today cheers always wonderd what was its purpose
Last edited by KIPS; 08 March 2007 at 09:39 AM.
#5
Scooby Regular
It's a water passage that heats up the 'air cut valve' which rotates to close or open up the main duty valve (itself controlled by the electromagnet on the top). It's basically assisting with the auto choke function on cold starts.
#6
So normal hot idle won't be affected, then. Damn. I'd hoped that it might be a solution to my idle problem - the usual dropping to 500 before rising to normal or sometimes cutting out altogether. I've tried all the usual fixes here - what is it with these damned things that makes them so temperamental
#7
Scooby Regular
Yes it could be. I had the biggest problem when it was cold, but it still occasionally did it when hot. Just gradually worsening weird idle problems. In the end after trying everything else, I just got a replacement off a scrappies and fitted it. I was gutted when I first went to start it up and the idle was all over the place, but it must have been just the Power FC learning new settings because the next morning, and ever since it has been absolutely perfect, like a new car.
A modern car should not struggle to idle smoothly, whether hot or cold. If it does, there's something wrong.
A modern car should not struggle to idle smoothly, whether hot or cold. If it does, there's something wrong.
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#9
Scooby Regular
It may well work ok without it, but if it gets stuck shut (or open, I can't remember which), it'll always be a pain. Anyway it's a coiled bimetallic strip that swivels a little wall around in and out of the air path through the duty valve.
#10
Dean
#12
Scooby Regular
You used to get some kind of similar thing on Beetles to stop them icing up. Anyway, if you have a Subaru technical manual you can see the cutaway diagram of it shows pretty clearly how the bottom part works.
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