Serious LT1 Opti issues...
#1
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Serious LT1 Opti issues...
I've been having countless Opti-Spark problems on my Heads & Cam 1995 LT1.
I recently disassembled my 5 month (2 month running) old Summit Opti-Spark, to discover the entire inside of the Opti was burned up, possibly causing a horrible misfire with any RPM over 2,500. I spoke to Summit and they shipped me a new Opti unit, and I shipped my old one back to them.
Tonight @ 9:30pm I finished installing the new Summit Opti correctly, the cam & the crank have not moved since I removed the old unit. So I bolted the Opti in exactly the same way I took the old one out so it can only go on one way into the cam assembly. I bolted the water pump back on, reconnected everything, filled the car up with some anti-freeze. Once I double checked that I had all the connections surrounding the Opti securely connected, I mounted the intake elbow, and fired up the car. The car started up instantly and idled like a champ. I let the car run for about 5 minutes, threw a couple of very smooth & very crisp revs, and shut the car off. I went to go wash my hands and come back to the car to move it off the lift, and then it no longer started!
How could the car run for 5 minutes and then just not start again? I checked for spark between the spark plugs & the wire and I saw nothing, i tried it about 3 times. I checked for spark from the MSD blaster coil & it was good. I disconnected & reconnected every connection on the front of my motor and everything seemed visually fine. I checked & rechecked for the following 2 hours without any success. It was getting late & I didn't have any spare spark plugs to change out. But tomorrow I'm going to run new wires & spark plugs just in case.
Any ideas? Can anyone give me any run-downs or a check list? Does anyone want to come up and look at the car?
After I change the spark plugs & wires, and if it doesn't start up, I'm pulling the Opti off and dissembling it.
I recently disassembled my 5 month (2 month running) old Summit Opti-Spark, to discover the entire inside of the Opti was burned up, possibly causing a horrible misfire with any RPM over 2,500. I spoke to Summit and they shipped me a new Opti unit, and I shipped my old one back to them.
Tonight @ 9:30pm I finished installing the new Summit Opti correctly, the cam & the crank have not moved since I removed the old unit. So I bolted the Opti in exactly the same way I took the old one out so it can only go on one way into the cam assembly. I bolted the water pump back on, reconnected everything, filled the car up with some anti-freeze. Once I double checked that I had all the connections surrounding the Opti securely connected, I mounted the intake elbow, and fired up the car. The car started up instantly and idled like a champ. I let the car run for about 5 minutes, threw a couple of very smooth & very crisp revs, and shut the car off. I went to go wash my hands and come back to the car to move it off the lift, and then it no longer started!
How could the car run for 5 minutes and then just not start again? I checked for spark between the spark plugs & the wire and I saw nothing, i tried it about 3 times. I checked for spark from the MSD blaster coil & it was good. I disconnected & reconnected every connection on the front of my motor and everything seemed visually fine. I checked & rechecked for the following 2 hours without any success. It was getting late & I didn't have any spare spark plugs to change out. But tomorrow I'm going to run new wires & spark plugs just in case.
Any ideas? Can anyone give me any run-downs or a check list? Does anyone want to come up and look at the car?
After I change the spark plugs & wires, and if it doesn't start up, I'm pulling the Opti off and dissembling it.
#3
my car died a few days ago, I had no spark at the coil, So I replaced the ICM. I had spark at the coil now but no spark at the plugs. Replaced the opti, still no spark at the plugs. Today I was thinking about it and just for ***** and giggles I replaced my Blaster coil with a stock one, the car fired right up. Even though you see spark at the coil doesn't mean its strong enough. I tested right at the coil and got spark, but I put the tester on the end of the wire from the coil to the opti and it couldn't fire through the tester. So I replaced my good opti when I didn't have too, but I replaced it with a MSD one . Hopefully my problem might help you.