Last night I took my car out for a short run - about a mile. All was fine.
About an hour later I went to start it. It fired up as usual, but the engine
started hunting badly, from between about 500 - 1500 revs. It also was
blowing a bit of soot from the exhausts, and there was a strong smell of
unburnt petrol in the exhaust. I tried switching off & on a few times, but
same thing each time.
I went inside & had a think. About a year ago, I filled up with fuel after a
long run (Shell Optimax as always), and on the trip home from the fuel
station the engine died several times. I was wondering if I'd overfilled the
tank or maybe filled a breather or similar. The problem however did not
I had recently filled up (to the brim) and this was the first run since
filling. I went out and undid the petrol cap, just to see if it sucked in
any air, but appeared not to. I tried starting up again, and it ran
perfectly. Any ideas what the problem may be? Mine is a pre-catalyst btw.
Idle control valve is dirty.
Remove valve, shoot in some WD-40 or brake cleaner and slosh around.
Empty it and dry it out. Swirl in a rag to get some left over gunk out, if
Reinstall and crank it up. It should run better and not hunt at idle.
Bill in Omaha