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Can a bad exhaust leak cause knock to show up on the log? After a cold start, and once I put the car to drive and give it some gas, around 1k-2k rpm it does have some rattling noise under the car. It goes away after you drive for a bit or the rpm is over 2k. Now the log doesn't pick up knocks during the rattling. However I was just curious if a bad enough exhaust leak or rattling noise can cause knocks under heavy throttle.
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