'88 5KSQ High Idle

[Christopher Ritchie]

Thanks, Chris.  That's where I'm at now - trying to eliminate causes.

What's the "frequency valve"?

The ISV?  I jumpered a ground to the ISV body.  No help.

Now I'm looking into the temp sensors.  I see 2 temperature sensors at the
outlet (inlet) on the block where the thermostat resides.  The 4 pronged
multifunction one and another 2 pin one.  But the 2 pin one doesn't look
like the one in the Bentley.  So I'm wondering if there is another one.

I believe here is one on the radiator.  What does that one do?

I also thought the function of the 4 pronged one was the temperature gauge
and the fuel management system (CIS-E III).  And that the function of the 2
pinned one was for the Autocheck system.  So that leads me to believe that
the multifunction one is bad.  I go through one of them per year, and this
one is overdue.  Unfortunately, it is a $50 part.

I'd like your idea of chasing down the grounds first.  Where does this
system get its ground?  The one under the ISV on the valve cover?  And what
is the "frequency valve"?  Finally, the Bentley talks about an ISV
controller.  What is that?


>From: "Chris Dyer" <chrisdyer at hotmail.com>
>To: critchie1 at hotmail.com
>Subject: Re: '88 5KSQ High Idle
>Date: Sun, 09 Dec 2001 23:50:07
>
>Temp sensors & frequency valve. On mine, it took a year before I finally
>cleaned the ground to the freq. valve--fixed it.
>
>from chrisdyer at hotmail.com
>
>
>
>>From: "Christopher Ritchie" <critchie1 at hotmail.com>
>>To: quattro at audifans.com
>>Subject: '88 5KSQ High Idle
>>Date: Sat, 08 Dec 2001 23:14:28
>>
>>Still troubleshooting a high idle problem on my '88 5KSQ.  Codes are 4444
>>and 0000.  No vacuum leaks.  Leaned conncetions.  Cleaning the old and
>>swapping in a good ISV was no help.  High idle about 90% of the time.
>>
>>What to look at next?
>>
>>_________________________________________________________________
>>Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
>>
>


_________________________________________________________________
Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp