IDLE SPEED WONT GO DOWN ON MY 944S

[leejohndobson]

Hi, can anyone help with a problem I have with my 1987 Porsche 944S 16V. The idle speed will not go any lower than 1200RPM now. I have taken other peoples advice and the problem has resolved a bit but not fully.
I have changed the o'rings on the injectors, changed the inlet manifold gasket, and checked all the air pipes, I found one air pipe off on the end of the fuel rail, so i put it back and the RPM dropped from 1200RPM to 1200RPM. I just need to sort it out once and for all, PLEASE CAN SOMEONE HELP AND GIVE ME SOME ADVISE. MANY THANKS........................

[Thom]

Could be the idle stabilizer valve. It should be located somewhere below the intake pipe.

[leejohndobson]

is it where the throttle cable is connected to at the top of the air intake or not, what will it actually look like, as i dont have a clue what im looking for.
Many thanks for the advise mate

[Thom]

Nope, it looks like a chrome-ish small cylinder (~2" diameter, 3" long) that is hiding below the intake pipe. There should be some Bosch labelling on it.

>> Edited by Thom on Sunday 30th January 16:31

[turbobloke]

Isn't there also an idle adjustment that is usually reachable with a suitably long implement and arms containing four universal joints?

[ninemeister]

Chck the wiring to the power steering pump switch first, this has a feature to increase idle speed when the pump is under load by activating the switch. Could be the wiring damaged, so check this out as well.

There is also a common problem of casting plugs coming loose under the manifold, but this is unlikely to be the case here as the idle is too low.

Failing this also check for cracks in the oil breather pipes or filler neck.

[leejohndobson]

Thanks for all the feed back, the idle adjusting screw is fully removed. I will take a look at the power steering pump wiring, as it has had a new adjuster fitted to it a couple of months ago. IF ANYONE CAN THINK OF ANYTHING ELSE IT MAT BE PLEASE LEAVE DETAILS. MANY THANKS............

[leejohndobson]

Hi all. Taken NINEMEISTER's advise and found there to be a wire off on the power steering pump, which i couldnt see at first as it is covered up with a rubber sleeve. Thanks for the help guys.

[ninemeister]

All part of the service.