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Random stalling 200 1986

posted by  Don Foster on  Fri Nov 14 15:20 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

I second Randy's suggestion and add that the CIS motor can really screw up idle (which is its purpose in life).

I had idle trouble with my '86 when I first bought it. Replacing the worn out CIS motor made a big difference. And cleaning the TB created a huge idle increase ---- to about 2500-3000 rpm.

Long story short, the PO's mechanic didn't bother fixing the root cause of the idle problem, he simply adjusted the idle mechanical stop (a no-no) to raise the idle.

Meanwhile, the venturi got varnished up, requiring additional adjustments, more varnish, more adjustment, and so on.

After I cleaned out the varnish, the opening around the butterfly was big. Readjusting the mechanical settings (linkage, throttle stop) restored the idle. Readjusting the throttle switch restored the CIS system to functionality --- and it has been fine for the last 90k miles, idling 850-900 rpm always.

Go after the CIS motor and throttle switch.
--
Don Foster (near Cape Cod, MA)






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