I know my ECM ground is suposed to be on the back of my engine block on drivers side. 89 vert. I cant find it looking down in that tight spot. Any suggestions on how to find it? Been looking from top. Should I be looking from bottom? Thanks for any advice.

You might find it abit easier from looking up underneath.

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Right. From memory, it's forward of and slightly above the oil filter housing. There should be several wires grounded to the block by a single bolt. I can't remember specifically, but the head of the bolt is pretty large, something like 11/16" or 3/4".

Also there is another single ground wire that runs to the frame in the same area.

Jake

you are thinking on two different places, combined into one!

The multi-wire grounding point is on the block/transmission juncture. It's one of the bolts that holds the transmission to the engine.

The other bolt is the ground strap, but it's a solo wire. And yes, it's real big.

Not to hijake,but would this be the same on an'87?

AFAIK, it's the same on all year C4s.

newbbe here n i kin say i preciate you cats awready ...thanks pappy