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Symptom of failing 2-wire PWM idle valve?

Posted: Fri Jul 12, 2013 5:25 am
by gofastant
Hi,

I have 3 bosch 2-wire idle valves. 1 does not respond at all, must be dead. 1 is inverted and the 3rd is normal. They were all built for the mk2 VW Corrado.

I'm using the normal curve unit right now and it hasn't been a long time on the MS but it has started to not go to cranking position at start-up. It seems to stay in the last running position. It will open up to the cold running state eventually. Has anyone experienced this?

Re: Symptom of failing 2-wire PWM idle valve?

Posted: Fri Jul 12, 2013 5:38 am
by Matt Cramer
I'd try oiling the valve first.

Re: Symptom of failing 2-wire PWM idle valve?

Posted: Fri Jul 12, 2013 5:49 pm
by gofastant
Will give that a try.

Re: Symptom of failing 2-wire PWM idle valve?

Posted: Fri Aug 16, 2013 11:13 am
by gofastant
Doh! It wasn't sticking, it's just that the crank-to-run time has no effect. After it starts it goes straight to run position. I created a different topic for this issue:
viewtopic.php?f=89&t=42567