EDIS module power and ground

[gofastant]

Hi, I'm doing some searching for the best method of wiring up the EDIS module and coils for a reliable, strong and accurate spark.

First of all, it seems reasonable to mount the noise suppressor on the coil bracket? This is how I have it now. It's close to the coil and convenient. Would it also be OK to ground the shielded wires on this bracket as well? This bracket is mounted to the inner fender as seen here:





I'm also reading that it would probably be best to run the EDIS module ground to the (-) on battery???
I just found an image of particular interest. It shows the EDIS module and coil packs utilizing different relays for power supply. I have mine sharing the same power wire. Any reason to change this? Does this create a ground loop between the bracket/chassis and battery ground? Seems like it would if I ground the coil body on the bracket and ground the module on the battery (-).




Thanks for the help! Right now I can't idle. Either getting too much fuel or improper spark.

[vinister]

I run both of mine off a single relay, ground the shielded wires at the shield pin (7?) of the EDIS, mounted the filter to the bracket, and ground the EDIS at a large chassis bolt where all my engine stuff grounds.

[Minami Kotaro]

My noise supressor is mounted to the coil. I had my ground wire run to a body bolt and my engine would never turn over 5500 or so. I moved the ground wire to the battery -terminal and, presto, 6900 RPM!

[gofastant]

Right now the module is grounded to the engine because I had a spare ground wire already hooked up there. I'm hoping that's the problem but will be mad at myself if it is!

[vinister]

As long as the alternator is still bolted to the engine, and your ground wire is in good shape, then there is no better ground.