Opti spark out?
Thread Starter
Launching!
Joined: Feb 2006
Posts: 206
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Opti spark out? I have a 94 Z28 with a 396. Took it to the track, finally got it running decent and on the way home, about 15 miles from my apartment the car started missing really bad above 2800 RPMs (I have a th350, so that is highway RPM).
Now I get in the car, drive it 10 miles, or 15 minutes and the car starts missing so bad it wont run. I thought it was the 02 sensors, but the car misses just as bad in neutral as it does in driving gear. I even tried unplugging the 02 sensors, and that didnt help anything either. I checked fuel pressure, it stays fine once the car starts missing, so its not the fuel pump. I had the Ignition control module tested and it checked out fine. I swapped out the coil with an extra I had lying around, that didnt help. Tried running it with and without the MSD box, that didnt help either.
I would have thought that if it was the optispark that it would run badly right off the bat, and not take 15 minutes for it to stop working, but I cant think of anything else it could be. Any thoughts?
Now I get in the car, drive it 10 miles, or 15 minutes and the car starts missing so bad it wont run. I thought it was the 02 sensors, but the car misses just as bad in neutral as it does in driving gear. I even tried unplugging the 02 sensors, and that didnt help anything either. I checked fuel pressure, it stays fine once the car starts missing, so its not the fuel pump. I had the Ignition control module tested and it checked out fine. I swapped out the coil with an extra I had lying around, that didnt help. Tried running it with and without the MSD box, that didnt help either.
I would have thought that if it was the optispark that it would run badly right off the bat, and not take 15 minutes for it to stop working, but I cant think of anything else it could be. Any thoughts?
Thread Starter
Launching!
Joined: Feb 2006
Posts: 206
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Thread Starter
Launching!
Joined: Feb 2006
Posts: 206
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Yeah... I have finally accepted it. I have owned various LT1 cars for 5 years, and this is the first Opti problem I have had... so I won't curse it to bad.
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Launching!
Joined: Feb 2009
Posts: 201
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Thread Starter
Launching!
Joined: Feb 2006
Posts: 206
Likes: 0
I was at 385 at 5200 RPMs then it fell on its face... I think if I had a working opti spark I would have squeked out 400 on the mustang dyno... but who knows. I am really not one for dyno numbers. 6 speed is gone now, so I will never know.
