Re:Tough A/C bolts, falling idle, and more on the 5kcstq

[Eugene Sokolovski <esokolov@glue.umd.edu>]

>- - The engine frequently dies after I've driven along steadily and then
>disengage the clutch as I come to a stop. The tach wavers around 200 or
>300 rpm and sometimes dies, or sometimes it rises back up to 600 and
>then idles at 700 or so. Other times it idles fine--700 rpm is its
>normal idle, without A/C, and I know that's low. Is this possibly ISV
>related?

  YES.If engine idles poorly, then most likely ISV is not working.
I just fixed the exactly same problem. First, clean up the ISV
with  carburettor cleaner.If there is no vacuum leaks 
(mine didn't have any-according to my vacuum/boost gauge),hook up
the DMM in series with ISV and check the current flow .
According to Mr. Bentley normal current through ISV is 430+-20 mA with
the
engine idling and A/C off.If current is 0 mA,check the temperature
sensor 
(the one on the top of the cylinder head coolant outlet),should be ~100
Ohm 
at the 80 degrees C. Also check the wiring from the ISV control unit to
the 
sensor , ISV and ignition coil and clean up all contacts with contact
cleaner. 
On my car this cured the problem.If wiring is OK, then you most likely
have 
the bad ISV control unit ($$$).

HTH

    Eugene

'86 5kcsT  5-spd  143K miles  1.8 bar    and idles fine at 720 rpm