Sonic with a 496 engine noise
#1
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Z06 Sonic Port engine started making a noise on his last ride before leaving today. Clunking noise with engine rotation. Engine idles smooth, noise gets faster with engine RPM. Sounded like the back of the engine, you can hear the clanking through the air intake. Tried unplugging back plugs to alter noise, did not seem to change noise. My PQ had a similar noise when I had a piston problem. Any idea's to look for. I found my problem by removing plug and putting a scope down the cylinder. Just trying to give Wally a direction.
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#3
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He didn't want to run the RPM's up. If it was in exhaust would you be able to here thru the air intake? We did try to turn exhaust on and off to see if it would alter noise. It did not change the sound.
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Just to be clear, this is a factory Merc 496 ?
#8
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Corsa muffled tips ?
#10
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Have had a few of those where baffle just inside them start to break loose where the owners thought they broke the motor.