Ignition control module - 1993 vs 1995

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May 10, 2008 | 10:27 AM

#21

DVNCI

Melting Slicks

Joined: Jun 1999

Posts: 2,949

Likes: 23

From: Bowling Green KY

Quote:

Originally Posted by Lichen

I'm running a 96 opti in my '93. You just need to change the timing cover and harness. You still use the '93 ICM. If your ICM and wiring are both good, then it is very likely the ECM. Good luck finding one.

Guys, I'm still confused on this.

I see many other posts regarding doing this and several say you DO need a different camshaft - I thought the pins were different length or something.

Lichen - so you still have the 93' camshaft in your car?

May 10, 2008 | 12:07 PM

#22

ScaryFast

Thread Starter

Safety Car

Joined: Jul 2001

Posts: 4,871

Likes: 15

From: Detroit's West Side MI

Quote:

Originally Posted by RUKWKR

I used the same camshaft with both optis, but it is a Comp cams part not stock. The key is that the older cams need to have the splined hole for the opti drive pin. The newer optisparks are driven from the offset cam pin instead of the splined pin in the center. You have to have a specific LT1 cam for the older style optispark.

If your cam has a pin on it then it will work, worst case the pin may be longer so just cut it down in length.

PM me your email and I'll send the document. You inbox is full...

Last edited by ScaryFast; May 10, 2008 at 12:10 PM.

May 10, 2008 | 12:46 PM

#23

DVNCI

Melting Slicks

Joined: Jun 1999

Posts: 2,949

Likes: 23

From: Bowling Green KY

Quote:

Originally Posted by ScaryFast

Just cleaned it out, and OK I think I'm clear on the cam thing now, once I get everything off I'll know. If it doesn't have the pin I'll probably throw a different cam in while I'm in there!!!!!!!!!!!!!

May 11, 2008 | 12:03 PM

#24

ScaryFast

Thread Starter

Safety Car

Joined: Jul 2001

Posts: 4,871

Likes: 15

From: Detroit's West Side MI

Quote:

Originally Posted by RUKWKR

ha, nice solution...

Email sent.

May 21, 2008 | 04:09 PM

#25

ScaryFast

Thread Starter

Safety Car

Joined: Jul 2001

Posts: 4,871

Likes: 15

From: Detroit's West Side MI

I tried my ignition module on a 1996 LT1 and it ran it fine. Apparently the old ICM's run the new cars but the new style won't run the old cars.

Weird.

Jul 6, 2008 | 01:51 PM

#26

schrade

Safety Car

Joined: Oct 2007

Posts: 3,816

Likes: 0

From: :45 minutes from everywhere / E-I-E-I-O

Quote:

Originally Posted by ScaryFast

Redeasy, this has piqued my interest. Is there a difference in the plug along the intake that goes to the optispark between the older and newer cars? I had a jumper harness from that connector to the '95 stock optispark I had. Perhaps the pinout to the MSD is different?

I'll check the two wiring diagrams...

Also, so the newer cars have a crank sensor? So I'll have to add this?

Where did you buy the jumper harness?

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