(no subject)

[Christopher Ritchie]

The 84 4kq is having a hard time staying running when cold.  It
starts just
fine, then stalls, and does this serveral times until eventually
it idles
very slowly and begins to run.  It will also die when the
throttle slams
shut and I have the clutch in.  It seems to be getting worse now
that it is
colder outside.  Once it is warmed up the car runs great.  I
have tried
cleaning the ISV serveral times without any change in
performance (seemed to
really work well on my old 90q20v).  I have fixed all the
vaccuum leaks I
could find.  I have discoverd the car does not have any
stalling/almost
stalling problems when the ISV is dissconnected.  This is why I
think the
ISV is the culprit, so how else do I test it?  I own a digital
multi meter.

So should I spend $179 at TPC for a new ISV or try something
else before I
spend the money on something that might not fix it?


Could be the ISV.  But also test the thermoswitch.  On my '88 5KS, the
thermoswitch is the 2 pronged sensor on the top of the housing for the
coolant outlet/inlet on the block where the thermostat lives.  Check the
resistance across the 2 terminals of the switch.  Below 68F, you should get
continuity (zero ohms).  Above 104F, it should be open (infinite ohms).

Please let me know if this fixes the stalling problem.  I've got a high idl=
e
problem that does not seem to be the fault of the ISV or a vacuum leak.  I
just tested my thermoswitch, and did not get the above values (They are fro=
m
the Bentley.).  So I'm going to replace that sensor/switch.  But I haven't
obtained the part yet.


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