Luuk

Hello, I am cleaning all intake parts from my porsche 944S. I always had a rough idle. So i check all parts too and install a new gasget. I am now doing the idle control valve. It seems that there are multiple versions. Mine is places on the intake manifold. It has a 2 pin connector. I saw that some 944 have a icv with a 3 pin connector.

My questions are.
-how is this icv supposed to look like? I see that is not closed entirely.
-how can is test this icv? Is there a + - where can set some voltage on?

Hope to hear from you. Thanks!

fejjj

Go to ClarksGarage.com as there is all kinds of helpful info there.

NM'87 951

Pelican parts has a good write up.

Here is the link to their page.

Luuk

Yes I saw these sites. Only I only see the ICV's with a 3 pin connector.
Not the 2 pin I have.
Bosch part: 0 280 140 514

Luuk

Found a part of my question: (source http://www.topbuzz.co.uk/info/iscv/iscv.htm)
Bosch 2-wire:

The Bosch 2-wire type uses a solenoid which opposes a strong spring. The solenoid is again supplied by a +12v source and the 2nd pin is the earth which is controlled by the EMU. When the solenoid is earthed it will override the force of the spring and move open and stay there until the earth is removed, where the spring will once again force it back down again (closed). The solenoid is therefore held at the fail safe 'closed' position.

However, even when closed there is always a small amount of air allowed to travel through the valve, giving low idle speed. The longer time the EMU energises the solenoid (holds open), the further open it will be. So to control the open time, the EMU pulses the solenoid. This frequency is typically very quick and by varying this frequency the EMU is able to control the ISCV at an exact position for idling.