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Old 10-25-2020, 02:32 PM
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Timberline Timberline is offline
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Default LS3 sound like it’s popping popcorn

I have a new GM crate motor LS3 525 and the first time I started it the engine purred like a kitten. Two weeks later I finally get back to take the car for a test drive and it sounds like it is popping popcorn out the pass side tail pipe.

Clarification I didn’t get the car out of ten drive way. Rev it easy to 2000rpm let it go back to idle it pops several time. Slowly take the revs to 3000rpm slowly bring it back to idle it pops even when the revs are climbing.

Any ideas where to start looking?
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66 Nova Sport Coupe
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Last edited by Timberline; 10-25-2020 at 02:37 PM.
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Old 10-25-2020, 06:12 PM
randy randy is offline
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Any check engine light? Do you have access to a scanner? Can you view any misfires? Can you post a video?
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Old 10-25-2020, 09:21 PM
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scan tool, check for a misfire. check make sure all your spark plug wires are on tight, none backed off. post a video if you can
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Old 10-26-2020, 12:23 AM
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Thanks
the check engine light did come on mid way through the run will check plug wires again.
I did have a 13 second video but it wouldn’t load.
Don’t have access to a scan tool.
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66 Nova Sport Coupe
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LS3 525hp, t-56 6spd
Build in progress
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Old 10-26-2020, 06:14 AM
dhutton dhutton is offline
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If you are going to mess with cars like this you need to spend $50 on a scanner that can reset codes.

Don
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Old 10-26-2020, 02:12 PM
randy randy is offline
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Guessing a plug wire came off. Unburnt fuel entering the chamber causing popping. Need a scan tool. Go to any parts store or Walmart and pick one up. If you were local to Dallas I would help you
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Old 10-26-2020, 05:50 PM
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Thanks will be picking up a scanner. I did check the plug wires last night and the boots were as they should be on the coil pack and plugs. Pulling the plugs tonight to check them out.

I agree I unburnt fuel popping. Just need to figure out which cylinder.

I appreciate everyone’s input. I am old school engine guy.... the new electronic motors are a different beast for me.
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66 Nova Sport Coupe
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LS3 525hp, t-56 6spd
Build in progress
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Old 11-07-2020, 02:57 PM
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Wanted to follow up on what I found. Pulled plugs all looked good except #8 it was black swapped it with #2 appeared to clean up a little but still a dead plug. Replaced and all is good.
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66 Nova Sport Coupe
Detroit Speed equipped front and rear
LS3 525hp, t-56 6spd
Build in progress

Last edited by Timberline; 11-07-2020 at 03:08 PM.
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