I have a 1996 Ford Mustang V6 with 130,000 miles. It has a bad knocking sound. The sound gets less or disappears when on the gas. It is worse when idling and right when I let off the gas. It doesn’t seem to make any noise within the first ten minutes of driving, although it does make a quick knock as it starts. I have read many forums with several answers from Rod bearings to oil pumps.
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FreeAutoMechanic Rule of Thumb:
Knocking noise is louder at idle and goes away when you rev the engine = Main Bearings
Knocking Noise gets louder when you rev the engine = Rod Bearings