Changing out the Ignition Coil Pack
 

I can't speak from experience on the MSD coils. But from what I've read, they have a tendency to fail and not enough gain for the price.

But, if you are running a L36 (or a 3100/3400), you can upgrade the coils with L67 coils. The L36/3100/3400 all use the same exact coils, but the L67 uses a slightly different coil (but the L67 and L36 use the same ICM and same quality wires).

I would not spend more then $30 for a set of used L67 coils, but they make for a nice/simple upgrade. All my current GM v6 engine have L67 coils on them. :)

Just curious what the L67 coilpacks do and if I got some for my 01 what year coilpacks would I need and would I have to change the wires too? Thanks.

L67 coils give a slight improved throttle response, nothing too crazy. You just swap the coils, the factory wires on the L36 and L67 are the same quality wire. And as for years, ANY L67 (I believe that is '96-'04). A tell tale sign of an L67 coil is look at the bottom of the factory coil, L67s have blue plugs. The others are white or gray.

OK Thanks for that info...

There's not much of a difference. Stock is as good as you can really get. I mean you can go ZZP or MSD but unless you've got more mods than I do you're wasting money. FYI before you waste money, you can't just buy L67 coils and put them on there, contrary to what was stated above. The harnesses are the same yes, but the bolts and ICM are not therefore they won't fasten down on to the ICM. Stick with stock and spend money elsewhere.

:confused: Uhm, yes, you can directly swap the L67 coils in place on a 3100/3400/L36 3800 with NO issues. The ICM in an L36 and L67 are exactly the same ICM down to the part number. But, the ICM in a 3800 is different then a 3100/3400 (but the coils match up perfectly).

The L36, 3100/3400 engines all use the same coils. The L67 was given coils the look the same, connect the same, but are slightly different.

I have direct swapped L67 coils on my '94 Grand Am with a 3100 (and moved them into my '02 Grand Am with a 3400). I also have L67 coils on my wife's 3400 and my L36 Monte. Zero issues, bolt all line up, connectors match up, it's plug and play, takes like 5 minutes to do. So I'm not sure why you're saying they won't bolt right up (I've done it multiple times and so have a couple other people here).

I admit, it's not a earth changing mod (hence why I would suggest not investing more then $30 total in the L67 coil swap mod). I noticed the performance of the L67 coils more when I pulled them out of my '94 3100 and put the stockers back in (and I hated that change, but I was selling the car).

Well the reason I say that, and have ran into the issue is when I tried to use the mounting studs from my L36 for the ICM on to the bracket of the L67 they wouldn't fit and the thread pitch was different. The bolts from the L67 coils won't screw in to the L36 ICM and vice versa. If you keep the ICM and bolts from the original coils I suppose it would work, but then again you're swapping the same part for the same part

When I first did my build the MSD coils were used. One failed in about a year, the casing was apparently to thin or wore thin etc. But the spark was jumping from the coil to the engine causing obvious performance problems. Matt just had me go back to stock coils as he said they were just fine and of high quality themselves. So thats what I run now, chucked the MSD's into the trash, more money down the drain... again :(

Like any product, a dud is bound to slip through every now and again. I've used MSD products for over 30 years - everything from a simple coil swap to complete systems including CD module/distributor/rev limiter - and have never had a failure. Mallory, Accel, Jacobs & Pertronix on the other hand have all failed on more then one occasion.

BTW - Did you know that the high performance ignition systems sold through GMPP are relabeled MSD?