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2-3-1 code won't go away 200 1989

posted by  Arthur on  Tue Apr 17 16:44 CST 2007
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last visit: Sat Aug 2 07:35 CST 2014
[RELATED]

2-3-1 = compensating for lean or rich mixture at cruise.
I had this problem last year and it failed smog test. I finally put new cat and passed, but I don't think I really solved the problem. Now its back.

Runs smooth at cruise, rough at idle.
Plugs are clean so i think it is running lean.
Mileage is very consistent 10 Km/l = 23.5 mpg US, about 50% highway.

Over last year I have swapped out or replaced the following - no improvement (thank god for parts cars)
oxy sensor
crank sensor
fuel pumps (in-tank had died anyway)
FPR
dist cap + wires + plugs
air filter
fuel filter
intake bellows
intake manifold gasket
flame trap/oil separator
cannot find any vacuum leaks and TB is clean
no oil or water leaks
I even tried Italian tune-up

at idle(warm) it is missing on #4 cyl - found by unplugging injector.

I'm now thinking maybe low compression on #4, will test it next week.

I'm stumped - any ideas? Is it just getting old?

Arthur
'89 245, M47, 450,000 km






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New 2-3-1 code won't go away [200][1989]
posted by  Arthur  on Tue Apr 17 16:44 CST 2007 >


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