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R&R the Coil

Removing, rebuilding, and reinstalling the ignition coil and ICM assembly on the front of the LH head of a 4th gen LT1 F-body. Shown with an MSD Blaster coil.

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R&R the Coil

Located on the front of the LH head is the ignition coil and Ignition Control Module (ICM) assembly.

Procedure

Get access to the coil

This is an installed coil. It just happens to be after I installed my MSD Blaster coil. I did not take any pics before I took the old, stock one off ;-). I have a K&N FIPK, so all I had to do to gain access to the coil, was to take out the MAF and the rubber collar on the FIPK side.

Installed coil and ICM assembly on the front of the LH head

Remove the coil assembly

Remove the coil wire and two other harness connectors. There are two studs holding the coil on. You will have to remove nuts (9/16) on each stud along with a bracket and some ground lugs. Take care when removing the nut where the ground lugs are. If necessary, hold the stud still with a wrench to keep the lugs from rotating and possibly tearing loose from the wires. Lay the lugs out of the way.

Remove the studs with a 9/16 deep socket. That is all there is to getting the coil out.

Coil and bracket assembly removed from the engine
Here, the coil and bracket assembly has been removed for service.

Separate the old coil from its mounting assembly

At this point you, have to separate the old coil from its mounting assembly.

Coil mounting assembly before disassembly
Exploded diagram of the coil mounting assembly
Exploded diagram of coil mounting assembly.

Chisel or grind off rivet heads.

Rivet heads being chiseled or ground off the coil assembly

Punch out the rivets. You may wish to use a block of wood for some support. The coil assembly is a little wobbly because of its shape.

Punching the rivets out of the coil assembly

These are the pieces you will have to reassemble.

Note: If you remove the ignition control module from its mounting, there is some silicone grease between it and the mounting plate. DO NOT clean this off, unless you plan to replace the grease. It is there to provide a proper heat-sink bond between the two parts.
Disassembled coil, ICM, and mounting plates

Assemble the new coil

Clean the surfaces and sandwich the new coil between the plates. Heat transfer grease is a good idea between the plates and between the plate and the coil mounting surfaces. Assemble using supplied nuts and bolts or ones of your choosing. My MSD #8226 came with assorted nuts and bolts.

New coil sandwiched between the mounting plates

Reinstall the coil

Only two studs to put it back on the front of the head!

Coil mounting studs on the front of the LH head

Reattach the bracket, ground lugs and nuts. Plug the harnesses back in. You can use this opportunity to put some dielectric grease on the coil wire tower, if desired. I am using an MSD 6A that requires only one connector where the dual one once was.

Coil reattached with bracket, ground lugs, and harness connected

Button it up

Put the coil wire back on, reassemble your intake parts, plug your MAF back in and you’re done.

Finished coil installation
MSD 6A ignition control, harness, and coil
MSD 6A, harness and coil.

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