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How does an ISC work? 

 

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Posted: Sun Mar 30, 2008 6:00 pm 
Getting Side Ways
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tried another ecu, didnt help

doesnt matter, as long as it runs, isnt noisy and flogging commodores im happy :)
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Posted: Mon Aug 18, 2008 12:56 pm 
Getting Side Ways
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Ride: R32 GTR

Location: Brackistan
VIC, Australia

Late reply however if you try restrict the amount of air going through the ISC then it will not be able to shut properly - it seems to depends on vacuum to close it.

Been there tried that wasted a few hours...
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Posted: Mon Aug 18, 2008 1:57 pm 
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Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
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Bozz wrote:
Late reply however if you try restrict the amount of air going through the ISC then it will not be able to shut properly - it seems to depends on vacuum to close it.

Been there tried that wasted a few hours...


i made the holes smaller in my isc gasket and it worked 100%.
and the isc should close without vacuum..
maybe the problems are different to what i had but it worked for me..
i did this about 1 1/2 years ago and it still idles 100%
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Posted: Mon Aug 18, 2008 1:58 pm 
Moderator
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Posts: 14513

Joined: 7th Nov 2004

Ride: ford falcon au3 xr8

Location: a shit suburb in sydney
NSW, Australia

Bozz wrote:
Late reply however if you try restrict the amount of air going through the ISC then it will not be able to shut properly - it seems to depends on vacuum to close it.

Been there tried that wasted a few hours...


i made the holes smaller in my isc gasket and it worked 100%.
and the isc should close without vacuum..
maybe the problems are different to what i had but it worked for me..
i did this about 1 1/2 years ago and it still idles 100%
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Posted: Mon Aug 18, 2008 2:06 pm 
Parts Gopher
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Ride: anything with a engine

Location: Gold Coast
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The Ford ISC valve operates like the "duty controlled ACV" valve in the
http://www.autoshop101.com/forms/h26.pdf document posted above. It is only connected to an output of the ECU. The ECU doen't appear to care if it is diconnected.

 

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For Sale; EF Plug and Play Megasquirt ECU Package. Includes ECU, adaptor loom, base tune, software.

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Posted: Mon Aug 18, 2008 9:37 pm 
Getting Side Ways
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Joined: 8th May 2007

Just to add, i fixed the 'rev hang' issue which plauged me since converting to manual.

Was done with a custom tune at Chiptorque, apparently they tapped into settings in the ecu which they dont normally touch, drives perfect now
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