It's lot more complicated then you make it sound. You mention fouled
plugs so misfiring cylinders seems likely, which is going to mean you
could have a rich exhaust even with the carb and distributor OK.
Distributer could affect mixture quite a bit if the rich condition is
due to float level set to high, but modifying the timing is only going
to make the engine run worse even if you succed in making the exhaust a
little leaner.
How good is the compression?
-jim
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Here are two things I've noticed:
1. Yes, timing curve does affect sensor readings.
2. If the mixture is very rich, the reading
actually goes up - looking lean. If you add fuel, the
readings drop (as you would expect). If you add even
more fuel, the numbers start coming back up. Why does
that happen? I don't know, but it does.
If you're indicating a near normal reading (13:1
or higher), but it still smells rich and fouls the
plugs, use a smaller jet.
--
.boB
2006 FXDI hot rod
2001 Dodge Dakota QC 5.9/4x4/3.92
1966 Mustang Coupe - Daily Driver
1965 FFR Cobra - 427W EFI, Damn Fast.