Idle Speed Control Valve
08-04-2009, 04:43 PM
#42
Testing the future
there's 2 screws. the small grub screw one sets the 'closed' throttle plate angle and the larger brass one with locknut alters the air bypass. the ISCV then also alters air bypass according to load to maintain the correct idle speed, so as said, you need to get the base idle speed correct when the engine is at operating temperature with no electrical load on it and with the ISCV electrically disconnected.
08-04-2009, 04:48 PM
#43
there's 2 screws. the small grub screw one sets the 'closed' throttle plate angle and the larger brass one with locknut alters the air bypass. the ISCV then also alters air bypass according to load to maintain the correct idle speed, so as said, you need to get the base idle speed correct when the engine is at operating temperature with no electrical load on it and with the ISCV electrically disconnected.
Thanks..
08-04-2009, 04:57 PM
#46
My problem now is it won't hold the revs. It's trying to idle at 600rpm and obviously eventually cuts out.
Can I adjust the tiny screw under the throttle body to slightly raise the revs? I can feel one there but can't see it.
Is it best to access this under the car?
Thanks
Can I adjust the tiny screw under the throttle body to slightly raise the revs? I can feel one there but can't see it.
Is it best to access this under the car?
Thanks
the idle screw is the larger one on the bottom of the throttle body, under the boost hose
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