Lt1 Engine Miss

**erik4816** · 07-17-2008, 06:26 AM

i have a 96 trans am lt1 with low power/ engine miss at low rpms. Seems to come and go. Engine light sometimes comes on while this is happening (always #7 cyl miss fire). #7 has a new plug and wire. I am planning on replacing the rest of the plugs and wires. I am wondering if the opti spark can also cause this. Any help would be appreciated.

**rbaksi** · 07-17-2008, 11:59 PM

I've got the exact same problem. Changed the coil and the icm to no avail.

I guess its the opti, really dont know

**N20LT4** · 07-18-2008, 12:59 AM

If you've upgraded to fresh plugs and wires, and it's still showing a code for cyl #7, I would say more than likely it is your opti. Time to replace/upgrade.

**95Firebirdred** · 08-06-2008, 11:44 AM

I had the same prob with mine. When you come to a light and sit a min it has a rough idle. When you start to go it is like it is starving for gas. I found the #7 plug wire was bad. it got up against the header and was burned. Replaced that and now it is fine.

**96slow6** · 08-07-2008, 10:45 AM

Before I jump to say its an opti problem you have a few more things to look at. Swap the #7 and #5 injector and see if the issue follows.

**Badbird** · 08-09-2008, 09:14 AM

opti. i have replaced mine 3 times in 30k miles. biggest joke ever. makes me sick

**5.0THIS** · 08-09-2008, 10:03 AM

Originally Posted by Badbird

opti. i have replaced mine 3 times in 30k miles. biggest joke ever. makes me sick

there's something else wrong. it is either being installed wrong, or some other issue is making it fail. Optis dont fail that often.

**Badbird** · 08-09-2008, 10:34 AM

i understand that but i know two other lt1 owners same deal. 1 replaced 2 MSD optis in 30k.

**N20LT4** · 08-09-2008, 10:54 AM

Originally Posted by Badbird

i understand that but i know two other lt1 owners same deal. 1 replaced 2 MSD optis in 30k.

Like 5.0 said, there has to be something else causing the failure. The MSD is a solid unit. If someone had two replace 2 MSD opti's in just 30,000 miles, the opti is not the direct problem.

**5.0THIS** · 08-09-2008, 11:41 AM

Originally Posted by Badbird

i understand that but i know two other lt1 owners same deal. 1 replaced 2 MSD optis in 30k.

so because you know a couple other people with the same problem it means the optis are the problem? no.

they're being installed wrong, or another issue is contributing to their early demise.

**erik4816** · 08-11-2008, 05:10 AM

opti spark, plugs, wires and water pump solved issue

**Badbird** · 08-11-2008, 11:54 AM

Originally Posted by 5.0THIS

so because you know a couple other people with the same problem it means the optis are the problem? no.

they're being installed wrong, or another issue is contributing to their early demise.

right on