[Supras] Help! Idle cutoff cycle

[berniek at technicaldevelop.com]

Jeff:

    Disconnecting the ISC was almost the first thing I did.  The 
oscillation did not stop.  Either the valve is jammed open. one winding 
of the stepper motor is open, or the signals from the ECU are not 
getting to it.  That will be a job to undertake after HG replacement, 
slated for this coming week since the salt mine is shut down.  I'm 
adapting a small DC gearhead motor to a 10" diameter lapping plate to 
refinish the block deck.  The head will be from the JDM rebuild I never 
finished (the head itself was blanchard ground and I did the valves 
here. including spring shims and surface grinding some bucket shims to 
get the correct clearance.

    Thanks for the thought.

       Bernie

Jeff wrote:
> 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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> 11:54 PM
>   
>>     
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