Sorry for bumpin this back from the dead, having trouble finding a map of all the grounds myself and am having some issues I believe to be related to a grounding issue. Anybody have any answer to how many/location of each?

 

This would be good to know.

 

Yeup

 

bump for location of grunds.

 

They are in the FSM. There are quite a few of them.

That wire should not be going to the valve cover though. There is a boss on the cam sensor that is specifically for that ground wire. It's the ignition return. That wire splits and also goes back to the ECU ground area. Hooking it to the valve cover means the current flow has to go back to the ECU area, instead of directly to the block. The cam sensor on the other hand has a direct electrical connection to the block through the body of the sensor. It's probably burning up during cranking because battery voltage drops and then the ECU cranks up the dwell time on the coils to try and make up for the low voltage. Do you have ignition issues though too, as I imagine it's killing coil charging even during normal operation.

FWIW, the EVO uses a ground bleed wire layout where there is a wire that runs between every major ground point on the chassis. The chassis takes the current flow, but that spare wire help bleed off any extra voltage potential between the ground points.

 

This is good info. I swapped out my IM and didn't attach the ground because there wasn't one obvious, so I thought, meh. Nope, had a very hard start and my coolant gauge was reading weird even though the temps were fine. Attached a make shift ground, problem solved. Thanks a random post Chad at CBRD had like 6 years prior.