hard start below 40(F) outdoor temps, cold engine. (3-4 hours from last start).
will run for a few seconds, then quit. After repeated attempts it will eventually stay running, albeit, very rough, and w/ exhaust backfire.
Once running for 2 1/2 minutes (almost exactly), regardless of how cold (eg -10 below), it transforms itself, and runs absolutely smooth. very repeatable;
ODB-II shows an accurate temperature.
Almost as though the EFI is transitioning from a closed/open loop program (or vice-versa. I forget if "open" implies, "fixed, no outside sensor inputs", if "closed" does...).
changing SBEC's made no difference. (yeah, that's what the local dealer suggested, and 92 2.2/turbo SBEC's are as rare as chicken teeth ...)
during the initial 2.5 minute back-fire in the exhaust, the exhaust looks/smells way rich; but I've not a good idea how to figure what should be considered "too rich" for a cold motor.
based on experience w/ other EFI motors, I'm tempted to suspect a 5th injector stuck open during the initial 2.5 minutes (does a 2.2/Turbo EFI even have a 5th injector, or something similar?)
Using the Block heater is one work-around (starts like a charm when warm), but that's of no use, when the car is somewhere I cannot plug in.
any Ideas, Suggestions much appreciated.