Pin8 On the MPI

All the beeping, zapping bits

Moderators: DJpowerHaus, mattmartindrift

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Dave99gst
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Pin8 On the MPI

Post by Dave99gst »

Does it make sence that the only way i can get the MPI to "click" and see any power back out of it is by Grounding Pin 8 ?
DJpowerHaus
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Post by DJpowerHaus »

You're going to need to be more specific.
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Getting the engine bolted in is about 10% of the way there.
The next 80% can go quickly with help and skill.
That last 10% takes about as long as the 90% that came before it.
Dave99gst
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Post by Dave99gst »

hmmm.. im not sure what else to say.
With the ECU and MPI both plugged into the harness. If i apply +12v to pin 10 the only way to get the MPI to function is to ground pin8

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89coltgt
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Post by 89coltgt »

Iirc, pin 8 keeps the mpi relay energized once the ecu powers up and keeps it energized until you shut the engine off. That set of contacts also supplies voltage to the engine sensors and ecu. This wire has to be hooked up into the ecu as it supplies the ground to energize the circuit.
Dave99gst
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Post by Dave99gst »

Welp - ive got no voltage out of the CEL circut. Prob a sign of a fryed ECU ? Ive got a friend with a 1g that im hopping to test the ECU/ in his car.
Dave99gst
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Post by Dave99gst »

Ok , i tested my ECU in a friends car and it fired up no problem.

wtf am i missing ?
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