A hole in the muffler would cause a knocking sound in your muffler. A loose exhaust pipe can also cause a knocking noise.
over-charging...great way to blow up the compressor...
it might be a bent piton rod if you or water or somthing into the engine
A seized gear can cause a knocking sound on a 1987 Nissan 5 speed transmission. A blown gasket can also cause this sound.
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Bad bearing or rod
your car being broke get it checked out
can you elaborate? engine noise? stationary/moving? ticking, tapping or a definite knocking?
extreme cold temperatures might cause Mazda rf diesil to make knocking sound , however; it is recommended that you get it checked from the mechanic.
the cause of this is probably a bad u joint
If a Baja 180 is not running smooth and there is little power, it might be a dead cylinder. It is possible that a piston is broken which would cause the knocking sound and vibration.
change fuel pump
check CV joints
bad bearings in it, the compressor, or bearings needs replaced... i just disconnected mine and took the pulley and belt off it.
low oil and a loose piston skirt
When the fuel in an engine cylinder ignites prematurely or unevenly to cause power fluctuations and a "knocking" sound. usually occurs when an engine is very how or improperly timed.
Engine knocking can be caused by numerous things. Having the incorrect spark plugs, carbon deposits on the cylinder walls, and being low on engine oil may all cause a knocking sound.
Heat shields often corrode and become loose but they usually cause a tinny rattling sound. Eventually they fall off as witnessed by the dozens of them found along highways. Mechanics often remove them (with your permission) if they are loose, because they serve no purpose other than to protect the technician from a very hot catalytic converter that he/she knows not to touch anyway. A "knocking" sound, however, is more likely caused by a worn or broken exhaust hanger, allowing the exhaust system to bump the underside of the vehicle. Be sure the engine isn't causing the knocking sound, driving around a car with a knocking sound in the engine can cause MAJOR damage. Knocking from your undercarriage can also be caused by suspension components that have gone bad or are leaking fluid.
does it sound more like a knocking sound from the engine at idle?
The Hummer H2 is a 2005 SUT with the 6.0L Vortec and a Magna Charger supercharger. It runs great with plenty of power, but I'm concerned about some noise I'm getting out of it. When I first start it up, everything sounds fine. After running a mile or so, I start to get a knocking sound. I only notice the sound when idling, not when running.
Most common cause would be a loose brake caliper mounting bolts.
Worn Ball Joint
If it's knocking it's probably a rod going out - if it's ticking it could just be the valves - Rodeos are notorious for value noise...