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

93 acting up

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Old Aug 15, 2010 | 04:48 PM
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Default 93 acting up

I replaced the Delco opti cap and rotor with an MSD vented and replaced Driver side header gasket and replaced driver side SP wires.

Now car idles good(slight miss and miss was there before, did not do plugs), rev in park and car revs right up. Put it into drive and car has no power and the valves clatter like mad.
Check the wires and they are on right, is there anyway to put the opti on wrong?

I must have put the SP wires on wrong, but would the wires on wrong explain the valve clatter.
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Old Aug 15, 2010 | 05:22 PM
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Are you sure that what you're hearing is valves? There wouldn't seem to be a connection to an ignition problem. Could you be hearing a misfire due to plug wires or ??
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Old Aug 15, 2010 | 05:44 PM
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It is valve clatter and not sure what I did wrong.
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Old Aug 15, 2010 | 06:09 PM
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If the opti slid into place against the timing cover without any resistance, it is on correctly. If it was forced on by the bolts, it isn't.
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Old Aug 15, 2010 | 07:15 PM
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No, it went on flush with my hands.
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Old Aug 16, 2010 | 08:08 PM
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Double checked the wires and they are on correct and snug.
Has anybody else ever put a MSD cap and rotor on a Delco opti and did you have any problems?

Narrowed it down to either bad cap and/or rotor or I somehow put the opti on wrong.
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Old Aug 17, 2010 | 11:15 AM
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I don't know of any way that ignition components can cause the valvetrain to make noise. The noise you are hearing likely is either not valves or is unrelated to the ignition.
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Old Aug 17, 2010 | 03:52 PM
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Sure the ignition can cause valve noise, if the timing is off far enough.
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Old Aug 17, 2010 | 03:59 PM
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Talked to MSD tech support, they were not much help. Guy said it could not be the cap if the engine revved in park, but I am thinking I have verified everything but the cap. Going to take everything back off and recheck the opti is on right and cap is clean.

Any reason I cannot start the car w/WP off and balancer on?
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Old Aug 17, 2010 | 04:04 PM
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Originally Posted by surfer93
Sure the ignition can cause valve noise, if the timing is off far enough.
Explain to me how that is valve noise?

And water pump doesn't matter so much but balancer...I wouldn't start it without it.

Last edited by thedudeman321; Aug 17, 2010 at 04:09 PM.
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Old Aug 17, 2010 | 06:03 PM
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If the timimg is far enough off, you get cylinders firing when the valves are open or slightly open and that will cause valve noise, from the explosion pushing the valve closed.
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Old Aug 17, 2010 | 09:48 PM
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Think I found my problem(I hope), when my starter went out, it took my my knock sensor out. In replacing everything that went wrong, I somehow did not replace it, so I am hoping that it is the problem, I will know tomorrow.
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Old Aug 17, 2010 | 10:53 PM
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Originally Posted by surfer93
If the timimg is far enough off, you get cylinders firing when the valves are open or slightly open and that will cause valve noise, from the explosion pushing the valve closed.
First off there should never be an explosion. Thats detonation(spark knock). That could be what you're hearing.

If compressive gasses are managing to close your valves...you better be prepared to replace some lifters, push rods, valves, and/or the cam because it would have to push all of that with it. Most likely the valve, which is the case when cam timing is off or the valves float and they get whacked by a piston. And it takes a pretty decent whack to bend a valve, and they usually stay open when bent.

There is NO WAY ignition timing could force a valve closed. Not gonna happen. The situation you described would cause backfiring through the intake or the exhaust.

I see that in your next post you mention the knock sensor. Yes. That could cause noises. But it would be spark knock. Not valve train noise.
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Old Aug 23, 2010 | 08:04 PM
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Ok, knock sensor is not the issue, forgot it ran fine when it was broken. So I am back to I either screwed something up or I have a bad cap and/or rotor.

Really do not want to go back into the opti, but it looks like I am.
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Old Aug 25, 2010 | 09:16 PM
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Originally Posted by surfer93
Double checked the wires and they are on correct and snug.
Has anybody else ever put a MSD cap and rotor on a Delco opti and did you have any problems?

Narrowed it down to either bad cap and/or rotor or I somehow put the opti on wrong.
you wouldnt be the first person on here to post about bad MSD parts (specifically opti)
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Old Aug 28, 2010 | 01:32 PM
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Can't blame MSD, it was my fault. I jammed the opti on wrong, but in my defense, it took little effort to put it on. The gear in the Delco opti is cheap aluminum, but it was my fault, I was tired and hot and did not take my time.
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Old Aug 29, 2010 | 03:59 AM
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Happy to hear you got it sorted out Randy. We all make mistakes, but it is rare when someone is honest enough to admit it. Sad because there is much to be learned from our mistakes, ask me how I know.
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Old Aug 29, 2010 | 01:32 PM
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Well it is not all sorted out yet, still have to replace the bad knock sensor and I need to replace my cats, but at least I can drive the car now.
No reason not to tell the truth, only person I would hurt would be me by not telling the truth.
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Old Aug 30, 2010 | 10:01 AM
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Well it is not all sorted out yet, still have to replace the bad knock sensor and I need to replace my cats, but at least I can drive the car now.




Stop by Harbor Freight Tools and get an 02 sensor wrench (crow's foot design). It'll make the job easier. And don't forget a dab of anti-seize compound for the new sensor (and possibly PB Blaster) for the old one to make removal a snap.


Last edited by onedef92; Aug 30, 2010 at 10:05 AM.
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Old Aug 30, 2010 | 12:18 PM
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Originally Posted by toptechx6
Happy to hear you got it sorted out Randy. We all make mistakes, but it is rare when someone is honest enough to admit it. Sad because there is much to be learned from our mistakes, ask me how I know.
And I thought I was the only one who pays for his mistakes. I try not to make the same one twice, but I can always find a new one.
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