C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Could this be the OPTI

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Old Sep 14, 2004 | 09:46 PM
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Default Could this be the OPTI

The 94 has not been driven since last Wed. On Sat I installed new radiator(Dewitts aluminum) and tonight I finally got the right size upper hose to complete the job. I filled the cooling system and ran the engine to 200 degrees. I shut it off for about 10 minutes and I was going to take it for a drive. This time it started hard and idled terribly. I could barely get it out of the garage. It pinged and missed badly. I let it sit for about an hour and restarted it and now it runs fine. Any suggestions would be greatly appreciated. It has 75K on it and I don't know if the opti has ever been replaced. Thanks Craig
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Old Sep 14, 2004 | 11:37 PM
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It sounds like the Opti but it would be not "running fine" if it was.
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Old Sep 14, 2004 | 11:57 PM
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that sounds like a coil wire that is intermitently grounding out.
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Old Sep 15, 2004 | 01:04 AM
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Originally Posted by CF6873
The 94 has not been driven since last Wed. On Sat I installed new radiator(Dewitts aluminum) and tonight I finally got the right size upper hose to complete the job. I filled the cooling system and ran the engine to 200 degrees. I shut it off for about 10 minutes and I was going to take it for a drive. This time it started hard and idled terribly. I could barely get it out of the garage. It pinged and missed badly. I let it sit for about an hour and restarted it and now it runs fine. Any suggestions would be greatly appreciated. It has 75K on it and I don't know if the opti has ever been replaced. Thanks Craig

Did you drible any antifreeze onto the opti during the bleeding of your cooling system? It sounds like it got a little moist or wet and then dried out.
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Old Sep 15, 2004 | 07:33 AM
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I'd check the coil and ignition module, too. Both can die with little or no warning and leave you stranded. Trust me...
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Old Sep 15, 2004 | 07:38 AM
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Originally Posted by bogus
that sounds like a coil wire that is intermitently grounding out.
this happened to me
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Old Sep 15, 2004 | 07:50 AM
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This sounds electricial. A ground wire to something? You are right,
also sounds alot like the Opti. You would know if coolent leaked from the reconnection and disconnection of the radiator. Good luck.
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Old Sep 15, 2004 | 08:09 PM
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Nothing was disconnected in the area of the opti, but I ran my hand under the pump just to make sure and there was no moisture. Tonight I took it for a 1/2 hr drive and it ran great. This is very puzzling. I will check the coil ground. Thanks guys, Craig
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Old Sep 15, 2004 | 08:15 PM
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Originally Posted by bogus
that sounds like a coil wire that is intermitently grounding out.

Yep, thats how my car acted when I had a bad coil wire.
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