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Old 01-09-2017, 09:41 PM   #4
29spcoupe
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Default Re: Snapping sound under load.

Could be spark knock. If your spark is advanced too far the spark is occurring before it should, thus fighting the piston travel. See if you retard the spark a little if it goes away. If the pinging starts when you first advance the spark, then your timing is too far advanced.
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