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Backfire after CAM install

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Old Feb 11, 2026 | 10:27 PM
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Default Backfire after CAM install

I'm getting major backfire after Cam install. This is a BTR stage 2 Red Hot on Grand Sport 6spd dry sump.

I know I'll need a tune, but thought it should at least idle ok.

It's supercharged but not sure that makes a difference.

Anyone know what might be the issue? I don't think messed up order of ignition coils.

Link here to video:

https://youtube.com/shorts/0c4Pv35jt7k?si=yGmIoUAksSiEb2yU

Any suggestions?

Rob
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Old Feb 11, 2026 | 10:39 PM
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First thing I'd check is cam timing. You could probably verify this with a compression test if you don't want to strip down the front of the motor again

really hard on an LS to get the coils and injectors wrong, the factory harness isn't long enough to mix them up
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Old Feb 11, 2026 | 10:41 PM
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I'm quite confident that timing marks were lined up as we had the oil pump off.

I wonder if the coil packs are backwards front to back.
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Old Feb 11, 2026 | 10:49 PM
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How could you have done that? It's one plug to remove the rack of coils each side. And you can't get the plugs on the wrong side of the motor- the harness isn't long enough
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Old Feb 12, 2026 | 10:43 AM
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Figure it out. Drivers side coil pack harness was flipped. Red lead wire supposed to always be on the right.
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