Questions and Answers

Ford Crown Victoria Dumping Fuel Q. Hope you are enjoying the holiday weekend. I have a 1987 Ford Crown Victoria with a 302 EFI and EEC-IV. It's a 2 door so I hate to get rid of it. The engine started flooding gas like you turned on a tap. Gas built up big time in the crankcase. Big clouds of black smoke out the exhaust. Barely runs. Drained oil and replaced plugs.

Changed the pressure regulator and the MAP sensor on the advice of a Ford Mustang owning friend. Fuel pressure is around 40 psi. Compression runs from 140 psi to 130 psi. Car has over 100,000 miles on it. I replaced the injectors when I replaced the regulator. I got new ones in a horse trade.

The only codes I can retrieve the two about high and low EGR or EVAP voltage. I made a plate and blocked off EGR, replaced the EVAP sensor with a good one, it made no difference. Timing seems all right, the distributer module is recent. Is it possible to have an impaired ECM without total failure?

Thanks for a reply if you have time.
Bernie

A. It is possible that you could have a ground fault on your fuel injection harness. Each injector is activated by a momentary ground signal from the engine control computer.

One wire will have constant reference voltage of 12 VDC or above and the other wire leads back to the EEC which grounds it's to close the circuit to ground thus causing the injector to open and allow fuel spray from the pressurized fuel supply. If one of the signal wires are shorted to ground then an injector would be stuck open in essence.

Thus, the troubleshooting procedure is to probe the injector harness (signal wire) with a multimeter set on the ohms scale and check for resistance to ground. If you find one shorted to ground unplug the EEC connector and test again.

If the short is no longer present, the fault is with the EEC, if the short is still present, the fault is within the engine management harness.