Possible loose exhaust pipe, check hanger clamps.
Usually, most knocking is from the muffler or exhaust pipe vibrating or bumping on the frame or something. Look for a damaged or broken strap.
Mine was making a knocking sound and I filled it up with premium gas. Sounds crazy but it actually stopped the valves from chattering. Might try it on your next fill up. 93 Octane.
your foot
In many card and token games a player is required to knock the table when he's down to one token/card The player so doing is said to be 'knocking' A gasoline motor is said to be 'knocking' when the air/gas mix is too lean Knocking can also be criticising, using a knocker of a door, declaring an auction over Knocking off: finishing work for a break, or the day: making a hasty job of: robbing Knocking up: waking: making pregnant: making hasty job of Knocking over: robbing Knocking down: to assault and to beat to the ground
my 1995 BMW 325i is making a knocking noise after i replace the water pump
probably broken bearings
your face a bru
making sure the camshaft is lined on so the piston dont get damaged on my peugeot 206
With out hearing it, It is hard to say whats wrong. But the most common noise like that would probley be a ROD knocking. Time for engine overhaul.
get a new trany or rebildit cuz its going out unless the knocking is from moter it might be timing
i don't know if it helps, but my '99 legacy outback was making a knocking sound. turned out that the oring on the brake caliper pin had worn out, and the pin was kind of knocking around.
There could be loosened internal mounts (connecting rods, pistons, pins, crankshafts or other related parts) in the compressor causing the banging or knocking noise. A simple call to a technician should resolve the issue.