Porsche 964 C4 Cold stalling

jazz635 · 12-26-2007, 04:13 AM

Hi Guy's and Girls,
Firstly Seasons greetings to you all!
Now to pick your brains?
Can anybody shed any light onto the Following Problem,
1990 964 C4 when cold it stalls and you have to keep revving it till in warms up,airflow meter or sensor?
I await your kind replies.
Best Regards
Jazz635

Don Plumley · Don Plumley's Garage

ISV = Idle Stabilization Valve is a likely culprit. Easy to take out and clean.

mjshira · 12-26-2007, 09:09 AM

Don is right. Clean it and you should be good. Use some brake cleaner.

jazz635 · 12-26-2007, 12:06 PM

Quote:

Originally Posted by Don Plumley

ISV = Idle Stabilization Valve is a likely culprit. Easy to take out and clean.

Cheers Don ,I will try it!
Best Regards
Dave

jazz635 · 12-26-2007, 12:26 PM

Quote:

Originally Posted by mjshira

Don is right. Clean it and you should be good. Use some brake cleaner.

Hi JAMES,
Thanks for the response I will check it out tomorrow (21 25 at this time here in England)
Best Regards
Jazz

jazz635 · 01-08-2008, 01:02 AM

Quote:

Originally Posted by jazz635

Hi JAMES,
Thanks for the response I will check it out tomorrow (21 25 at this time here in England)
Best Regards
Jazz

Hi James
Happy New Year!
I have now got around to taking the valve out and cleaning it but to no avail,looks like someone else before me tried that! I notice a bit of scoring on the bore,so I think i will replace it .
Regards
Dave

Atlantic07 · 01-08-2008, 08:31 AM

I have the same problem. (I know I should have bought the repair book and I will !)

Can anyone give me a hint or send a picture where I can find the ISV on my 1991 964 C2. Symptom is that when it is cold, I have to start the car 2 or 3 times.

Thx guys!

Atlantic07 · 01-08-2008, 05:50 PM

I figured it out!