BeaverItout
Probationary Member
- 7
- 1
- Jul 31, 2018
-
Stevens Point,
Wisconsin
Resurrecting a 92 1G that has been a relic of the yard for the past decade. Previous owner almost killed me when i figured out the fuel pump was shorting out in the tank with a hot wire with no inline fuse coming off the fuse panel to the pump to ramp up pump voltage. tank was shot, pump was shot. took a while to find a new tank and installed a 255 walboro once i did this last week. was not getting spark. did a bunch of wire chasing and figured out i was not getting supply power to my ecu. Turns out only the fuel side of the mpi relay was switching on for fuel, but the other half was not switching on to turn on the ecu. I am fairly confident with wiring but still hate doing it and there is much to be learned, but i traced the problem to what looks like a diode inline with the ecu side of the relay. when i jump 12v past the diode the little electromagnet inside engages the contacts, but when i apply voltage to pins 10 & 8 on the relay i get nothing. obviously the diode is bad, but my question is how important is that diode in place? cant find much on it but what i am guessing is its in place to eliminate back voltage surge to the ecu incase the motor dies?? wondering if i can bypass the diode via a jumper or will it cause more harm than its worth down the road. Once i finally figured out i had no voltage there i closed the contact points so i could get it started long enough to move the vehicle to a spot where i can legitimately work on it. It runs for a bit and dies, and throwing code 44, but ill save that for another discussion, thanks!
Suspect diode
Suspect diode
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