A knocking noise when coasting in a vehicle could be caused by issues with the engine, transmission, suspension, or brakes. It is important to have a mechanic inspect the vehicle to determine the exact cause of the noise.
Engine knocking occurs in a vehicle when there are misfires in the spark plug ignition causing an air/fuel mixture to explode outside the envelope of the normal combustion front. This condition could be very damaging to an engine if not checked by a mechanic.
Have vehicle scanned to determine the problem
A knocking noise when pedaling a bike could be caused by loose pedals, a loose crank arm, worn bottom bracket bearings, or a misaligned chain.
The knocking noise could be one of several things. The wheel bearing, a worn steering or suspension part, or road debris could be causing the noise.
A clicking noise on your bicycle when coasting could be caused by loose or worn out parts, such as the chain, pedals, or bottom bracket. It could also be due to misaligned gears or a problem with the freewheel or cassette. It's best to have a professional bike mechanic inspect and diagnose the issue for proper repair.
The loud pipe knocking sound in your plumbing could be caused by water hammer, which occurs when water flow is suddenly stopped or redirected, causing pipes to vibrate and create noise. This can be due to high water pressure, loose pipes, or improper installation of valves.
There are a number of reasons why an engine would knock when you idle the vehicle. It could be your motor mounts. You may also need oil.
Many things actually, like not taking care of your vehicle and letting the oil in it get bad, which could cause the engine to blow up!
Might want to pull off the inspection cover and see if the bolts that hold the torque converter are tight. Also check the condition of the flexplate.
more than likely a valve!
this sounds like the big end bearings in engine are worn.this is an expensive repair,depending on how long the knocking has been knocking and whether the crankshaft has been damaged enought to need a new crankshaft.
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.