Since the dizzy, rotor and cap are new,I have to check and fix
injectors
ignition timing
DPR setting
spark plugs
cables
Not sure what order.
I'd start with the injectors first - I purchased a used, balanced
set from Marren Motorsports for the racecar. While you probably
don't need that for the street, it might be just as cost
effective. Once you know the injectors are working properly, set
the specs and go from there,
I'll have to disagree with Matt, here. Diagnosing CIS fuel injection
problems can be much less straight forward than dealing with ignition
woes, not to mention that injection system parts tend to be much more
expensive than ignition parts (ONE new injector costs $60 - over
$100, depending on where you get it). I would eliminate the simple
stuff first. If your plugs, wires, cap & rotor are more than a year
or two old, or of unknown origin, replace them! You don't want to
tear your hair out over a misfire, only to discover it was an
intermittent plug wire, after you've spent a bunch of money on
injection parts. Plus, you can pretty much rebuild and set up the
ignition system without the engine running. Another important point,
when messing with the DPR current, you MUST have the engine
COMPLETELY warmed up, as in driving the car for at least 5-10 miles,
especially if it's below 60 deg outside. Have you checked/replaced
the O2 sensor? Those things can have various failure modes that can
cause confusion with problems such as yours. As for the injectors,
you can test them individually for spray pattern and leakage. Just
follow the instructions in the Fuel System section of the Bentley.
If the ignition checks out, you should start checking the injection
with the fuel pumps. Your problem could easily be a transfer pump
getting weak, or even the main pump. I had a weird problem similar
to yours a while back, and when all was said and done, it turned out
the main pump was working just enough to make it very confusing to
diagnose.
Good luck, and let us know what you find,
--Holland
