Unless the control unit was shorting out the ECU temp sensor, it has
nothing to do with the idle mixture.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Richard Golen
Sent: Tuesday, May 13, 2003 7:36 PM
To: vanagon@GERRY.VANAGON.COM
Subject: 87 Rough/High Idle problem solved (I hope)

Hi,

My 87 appears to be back to normal...its idling smoothly...and at the
proper RPM. For a couple of months now at start up it would belch black
smoke...run rough...and after warming up the idle would hang up at 1500
to
2000 rpm.

Disconnecting the ISV took care of the high idle. However, the rich
condition at start up was still there...and it was getting to be a pain
to
warm the engine up until the cold start enrichment process stopped.

That all stopped today. Chris Turner had a used ISV Control Unit and
sent
it to me. Popped the right rear tail light...reached in side...unplugged
the old ISVCU, popped in the "new" one....reconnected the ISV...and
VOILA!
IDLE!! Smooth......no belching smoke...no misfiring. Drove it around for
about 20 minutes and it idled normally. I think I'll take the Westy to
work
tomorrow and see what happens...got my fingers crossed!

Ric