Remebaer, what is displayed is typically "in addition to"
what ever you have set for initial timing.
Regarding your suspected MAP error, does it smell really rich
at idle? If so, it may need a MAP sensor.
Just as a general observation, I haven't seemn systems
that idle with no advance, and pass emmisions tests..
How is the low speed drivability?
Mike V
>
> I recently bought an Auto Xray scanner and have been playing with it on
> my Dak. I've found some interesting things about the timing. At idle, the
> timing varies between 0 - 4 degrees. At full throttle, total timing seems
to
> somewhere around 26-28 degrees, but it isn't all in until almost 5,000rpm.
> Between 2500-4000 timing was at around 19 degrees. Cruising at 55mph in 5th
> gear gives me 40 degrees timing. It seems to me that I've got an EXTREMELY
> slow advance curve, though the electrical equivalent to a vacuum advance
> appears to be working. Any thoughts on what might be causing this?
Shouldn't
> I be getting around 10-12 degrees at idle? I have the stock PCM. Also, my
> idle isn't really steady. It varies about 75 or so rpm, though it seems to
> idle around 600rpm or so. Throttle position at idle is 11%. Another thing
is
> that my MAP sensor is only showing 12 inches of vacuum while the engine is
> actually producing 16-17.
>
> Doug Myers
>
> '99 Dakota RC/SB 318/5-speed/3.92SG
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