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Old 10-10-2018, 09:30 PM
sic7camaro sic7camaro is offline
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Default Need help, 67 Camaro with rhs 502

When I go to start it, the starter seems to engage the flywheel and spin the motor a little and then a loud bang and it seems like the motor kicks back the opposite way.
Sometimes it will turn and fire up, but seems like it runs a little rough.

Here is a video I made of it. The first two starts are with the coil harness plugs disconnected and it spins the motor fine like that. The others are with them connected and you can see how the motor seems to kick back https://m.youtube.com/watch?v=gmSln5mdTEc

Last edited by sic7camaro; 10-10-2018 at 09:52 PM.
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Old 10-11-2018, 08:17 AM
dhutton dhutton is offline
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Too much crank timing advance is my guess.

Might be useful to tell folks what EFI controller etc you are running.

Don

Last edited by dhutton; 10-11-2018 at 08:54 AM.
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Old 10-11-2018, 10:23 AM
sic7camaro sic7camaro is offline
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Thanks for the reply, okay so it has a pcm out of a 2004 gto and a vaporworx fuel controller, and the pcm has a base tune in it.
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Old 10-11-2018, 11:09 AM
dhutton dhutton is offline
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Quote:
Originally Posted by sic7camaro View Post
Thanks for the reply, okay so it has a pcm out of a 2004 gto and a vaporworx fuel controller, and the pcm has a base tune in it.
What cam? Base tune from a 2004 GTO?

Don
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Old 10-11-2018, 05:17 PM
sic7camaro sic7camaro is offline
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It’s a cam motion hydraulic. I had a base tune done for the 502 motor
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Old 10-11-2018, 06:33 PM
dhutton dhutton is offline
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I’m no expert but I think the timing is too advanced when cranking. I would get a better tune. Maybe one of the experts will chime in.

Don
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