this picture is labeled as PCM harness grounds, but I think that is refering to the right of this picture? what is the black connector? can it be removed or relocated? Thank you to Shoebox for the picture

 

That's the ICM (Ignition Control Module).
I would think you could move it as long as you keep the heat sink with it.

 

The black wire is probably a ground.

 

Shoebox also has a complete wiring harness photo, with the connections labeled. Since those two ground wires come out of the PCM harness, I suspect he has traced them back to the PCM as grounds.

http://shbox.com/1/harness.htm

 

ok ICM, I see now. It looks like I could move the ICM and leave those grounds there. I'm going to give it a shot. thanks

 

Yes, that works. I don't use the ICM, its been removed, but all the grounds are still attached to the head stud.

 

what exactly does the ICM do and does something need to take the place of it if it is completely removed? Can you only remove it if you have an MSD ignition or something?

If I kept it I think I could put it where the AIR pump was and it would reduce the clutter on the head.

Thanks

 

The ICM Ignition Control Module takes care of you timing.
You can't remove it something has to take it's place like an MSD box.

 

ok thanks...that's what I thought. I will just move it down on the block out of the way for now. Maybe I will want to upgrade the ignition later on, but for now I want to get this thing running!

One last question though...to move the ICM far enough down where I want, the "spark plug" wire going to the opti is a little short. Can I just make a longer wire to use in it's place?

Thanks

 

Yes, you can. Make sure you have the right ends on it...I think it is a specail end that goes in to the Opti...not sure on that.

I can't stand making my own wires...it's such a pain in the ***.

 

The PCM sets the timing, and sends the signal to the ICM at the correct instant. The ICM is the switch that tells the coil to fire.

If you switch to a direct fire coil system, like the Bailey LTCC setup, with 8 LS1-style coils, you don't need the ICM. I run an aftermarket ECU that has an 8-channel driver, that fires 8 LS1-style coils, hence no IC Module.

An MSD multiple spark system ("box") still requires the IC Module.

And to clarify, the metal heat-sink base holds both the IC Module (top) and the coil (bottom). The red item is the coil (because Shoebox has an MSD coil - factory is black). That is the point where the ignition wire connects to the Opti. You can lengthen the coil wire by replacing it with a high quality, low resistance spiral-wound ignition wire.

 

the Bailey LTCC setup with 8 coils would replace the opti I assume?

 

Not totally.You will still need it to give the timing to the ltcc box(just like a big cam sensor ).

But yeah it would delete the high voltage part of it wich is the weak point of the opti.

 

keep in mind that Ignition Control Modules do not like heat it will kill them. I know I own a fiero.