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CORVETTE C6 Harmonic Balancer wobble?

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Old Sep 29, 2025 | 05:04 PM
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Default CORVETTE C6 Harmonic Balancer wobble?

I’m just wondering if I should replace my harmonic balancer or does it look normal? It’s been giving me intermittent misfires but I just drove it down the block so far so good can the wobble cause misfires?
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Old Sep 29, 2025 | 05:38 PM
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My C5 has wobbled more than that for 120k miles.I don't know of any ways that would cause a misfire code.
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Old Sep 29, 2025 | 08:26 PM
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Any vibration that causes the crankshaft to slow down can cause an “ECM induced” misfire…the crankshaft position sensor is the ECM’s misfire monitor…as in the blue crankshaft position sensor waveform below on my 2008 if the time between the signal “falling edge” increases the ECM sees this as the crankshaft slowing down…there are 58 teeth on the reluctor wheel…worn torque tube couplers can also cause these random P0300 misfires…sorry but didn’t look at your video.


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Old Sep 29, 2025 | 08:41 PM
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Mine has looked the same for as long as I can remember.
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Old Sep 30, 2025 | 11:37 AM
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@C5 Diag would those misfires cause a code? Could the random intermittent misfires be caused by an ignition coil, and would that sort of misfire cause a check engine light?
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Old Sep 30, 2025 | 11:39 AM
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Originally Posted by diegoquinones
I’m just wondering if I should replace my harmonic balancer or does it look normal? It’s been giving me intermittent misfires but I just drove it down the block so far so good can the wobble cause misfires?
I couldn't open your video, but I think everyone gets a little too hyper fearful that their harmonic balancer is going to wobble the motor to death.
If you're feeling a vibration it's more likely the torque tube. (Imo)
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Old Sep 30, 2025 | 11:51 AM
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Originally Posted by Corvette_Dez
@C5 Diag would those misfires cause a code? Could the random intermittent misfires be caused by an ignition coil, and would that sort of misfire cause a check engine light?
A torque tube would cause a P0300 random misfire and anything other than an intermittent coil “control” circuit DTC (P0351-0358) can cause a cylinder specific misfire vs (P0300-0308)…maybe a lost power on ground on the coil pack…most of the times you will see a P0300 plus a cylinder specific misfire…sometimes a random misfire can be fixed by doing a “crankshaft variation learn”…these misfires won’t be actually felt…you may just see a flashing MIL with a smooth running engine.
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Old Sep 30, 2025 | 04:56 PM
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Originally Posted by diegoquinones
I’m just wondering if I should replace my harmonic balancer or does it look normal? It’s been giving me intermittent misfires but I just drove it down the block so far so good can the wobble cause misfires?
Looks fine to me. No worse then my '05 that's been running for many years that way.
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Old Oct 1, 2025 | 05:30 PM
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Ok thank you guys for the feedback I finally figured out my issue on the misfire. It’s was giving me misfire in cylinder 1 but it was the injector connector on cylinder 6 was not clipped on all the way due to a broken injector clip!
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Old Oct 2, 2025 | 09:27 PM
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Originally Posted by diegoquinones
Ok thank you guys for the feedback I finally figured out my issue on the misfire. It’s was giving me misfire in cylinder 1 but it was the injector connector on cylinder 6 was not clipped on all the way due to a broken injector clip!
Good catch.
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Old Oct 8, 2025 | 10:26 PM
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Originally Posted by Corvette_Dez
I couldn't open your video, but I think everyone gets a little too hyper fearful that their harmonic balancer is going to wobble the motor to death.
If you're feeling a vibration it's more likely the torque tube. (Imo)
thanks. yeah, it's one of those things I guess we all think of & what could happen. I'll just keep an eye on it for now.
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Old Oct 8, 2025 | 11:04 PM
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