[Supras] Help! Idle cutoff cycle

[Jeff]

I had what sounds like the same problem on my 91 t - 2 months AFTER I
replaced the ISC. Turned out to be a corroded terminal on the connector. Why
not just disconnect the plug to the ISC and see if the oscillations stop?

JP
----- Original Message ----- 
From: <berniek at technicaldevelop.com>
To: <Bigmacz28 at aol.com>; <supradon88 at yahoo.com>; <supras at supras.com>
Sent: Wednesday, June 27, 2007 11:13 PM
Subject: Re: [Supras] Help! Idle cutoff cycle


> Don, Joe, Bob and and group:
>
>     I wrote before about a hunting idle condition in a '91 turbo between
800 and 100 RPM.  I have not had the time to dig into it more yet, but it
appears to be the ISc, but no codes are set.  I was going to manually
"throttle" feed to the ISC from the accordian hose by inserting a piece of
soft Tygon tubing in series with the tubiing to the ISC and then pinching it
with pliers as a test.  After tubing insertion, the flow resistance was
enough to bring the hot idle down to about 1000 RPM.  It does droop when the
A/C or lights are turned on, so apparently the ISC is not working.  But the
mystery is that no codes are set.
>
>     Anyone have any ideas?  I'm going to try to get through NJ inspection
on Thursday with it as it is.  There are hints of a BHG:  Misfire after
startup and pushing water out of the radiator.  But I intended to change the
HG next week any way.  No sign of antifreeze in the oil.
>
>         BernieK
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