LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Destroyed Opti *PICS*

Old 05-07-2008, 11:30 AM
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Destroyed Opti *PICS*

I replaced my opti this weekend. The unit I installed was a remanufactured part (BIG MISTAKE) with an MSD cap/rotor kit.

The MSD components bolted right up to the reman core. I turned the dowel gear to check for clearance, and she ran smooth as silk, so I went ahead with the install.

I drove the car roughly 40 miles before it started backfiring, and eventually stalled out on me, and threw the DTC Lo-Res Fail code again, which of course means, DEAD OPTI.

Curious how it could have crapped-out already, I take the opti out, and this is what i see...



The dowel gear was just a couple mm too long. I couldn't use the factory drive pin, as the reman core had it's own pin installed, and was non-removable.

When I bolted the opti to the front of the motor, the extra lengh in the pin pushed the rotor up, into the cap, and the damage is clear.

Let this be a lesson to everyone purchasing a new Opti, and not sure of which part to buy. STAY AWAY FROM CHEAPER REMAN PARTS!!!
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Old 05-07-2008, 11:42 AM
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Nice carnage. Was the rubber o-ring installed under the cap? I dont see it in the pic. This will have given you more clearance to possibly avoid this.
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Old 05-07-2008, 03:56 PM
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Yeah, the supplied o-ring was used. I think I just tossed it as soon as I removed the cap.

Note the plastic shavings... hahaha. Carnage indeed!
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Old 05-08-2008, 09:09 PM
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Sorry to hear about the failure, but nice work man ...
if you're gonna break it .. break it good.
Thanks for the pics.
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Old 05-08-2008, 11:12 PM
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Good lord! Opti strikes again! Did you try spinning the pin by hand first? To see if there was any tension.
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Old 05-09-2008, 12:11 AM
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Originally Posted by Dadic 78
I replaced my opti this weekend. The unit I installed was a remanufactured part (BIG MISTAKE) with an MSD cap/rotor kit.

The MSD components bolted right up to the reman core. I turned the dowel gear to check for clearance, and she ran smooth as silk, so I went ahead with the install.

I drove the car roughly 40 miles before it started backfiring, and eventually stalled out on me, and threw the DTC Lo-Res Fail code again, which of course means, DEAD OPTI.

Curious how it could have crapped-out already, I take the opti out, and this is what i see...



The dowel gear was just a couple mm too long. I couldn't use the factory drive pin, as the reman core had it's own pin installed, and was non-removable.

When I bolted the opti to the front of the motor, the extra lengh in the pin pushed the rotor up, into the cap, and the damage is clear.

Let this be a lesson to everyone purchasing a new Opti, and not sure of which part to buy. STAY AWAY FROM CHEAPER REMAN PARTS!!!
Are you talking about the dowel pin off the cam?
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