Re: more on '87 TQW idle problem?

[steveb@newkla.kla.com (Steven Buchholz)]

>   and repeats at about a 3-second frequency. I cleaned the
>   stabilizer, still no help. In looking at the stabilizer, I can see
>   that the CPU is varying the airflow by modulating the valve,
>   it all looks OK, but when reinstalled the problem is back.
>   Is it a common failure mode for these stabilizers to leak?
>   I wonder if a poor seal inside is causing a leak that results
>   in the high/increasing idle.....These suckers are like
>   $125 US, so I'm going to look at the O2 sensor voltage
>   before blindly swapping this puppy out. Any other ideas?

Didn't you say that you disconnected the electrical input to the
stabilizer and the idle was still high and surging?  If that was
true then the problem is in the idle stabilizer, no need to look
into the OXS.  I could imagine something coming loose inside and
oscillating, causing the idle to vary as it does.  

Best of luck!
Steve Buchholz
s_buchho@kla.com