I have a 2001 Dodge Grand Caravan Sport 3.3L Flex Fuel (145,390) that
turns over but has no spark at the plugs. Originally thought the
problem was the fuel pump, so pump & fuel filter were replaced.
Also replaced crank and cam sensors, removed coil pack, cleaned and
tested for proper voltage. Final step was to replace ECU with
remanufactured / preprogrammed ECU (mileage, VIN, OEM part #
provided). Replaced ECU but starter would not engage. Bypassed the
electronic start by applying power directly to the starter which did
engage. Replaced the new ECU with the original ECU and I was able to
turn over but without firing. It seems as though there is some sort
of safety shutdown on the new ECU or it was not properly programmed
for my vehicle. Any suggestions?