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Irregular Idle
Posted by Ron Greigg (more from Ron Greigg) on Mon, 17 Jun 2002 12:47:20
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00

My '88 900 Turbo suddenly started behaving badly when I tried to start it
this AM. It started and then would not settle into a proper idle.
The tach needle indicated wild swinging between virtually 0 and 2000 rpm.
The engine would rev and then fall back to 0, then rev again, etc. It would
catch itself before it stalled although I only let it continue this behavior
for about 30 cycles (about 60 seconds) before I cut it off. When I turned it
off it didn't 'diesel', just clean shutoff.

The only 'service', if you can call it that, done recently was yesterday I
cleaned the corrosion off the battery cables, good old Coke does a great job
neutralizing that crap, and topped off a low radiator expansion tank. The
previous day I had it out for a drive, maybe 40 miles, and back in the
driveway it wouldn't idle down below 1500-1800 rpm, my first sign something
was amiss.

Could it be cold start enrichment valve???
Any ideas?
Thanks in advance.
Ron Greigg
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