Backfiring in any motor is either badly out of time or a burnt valve.
In the absence of any other problems (such as lean running condition, worn or non-iridium spark plugs, or damp weather) expect an EGR valve stuck open or a faulty MAP sensor.
Pulmonary semilunar valve (pulmonary valve)
Never ever use a Gate type of valve for throttling ONLY a globe pattern is designed for this purpose and a needle valve
I believe you are referring to the "mitral" valve. It is also known as the bicuspid valve. It is the valve between the left atrium and left ventricle.
A compression test will show you if you have a burned valve.
A compression test will show you if you have a burned valve.
Remove the head and have the valve reseated or replaced.
buy a new valve
check for bent or burnt valve check for bent or burnt valve
some of the gases are burnt and reduced befor going to the exhaust
Out of time or a burnt valve
burnt valve...
Sounds like a burnt valve, the gas is not burning because of no compression due to burnt valve and gas is pushed out of exhaust unburned
Bad plugs or plug wires. Blown head gasket or burnt valve. A compression test will eliminate burnt valve or blown gasket.
You take the car to the Shop, pay someone 1600$ (est) to remove the cylinder head and get the head rebuilt. Have them replaced the water pump and the timing belt while they are doing it. The reason a valve gets burnt, is that the valve does not touch the valve seat to enable it to be cooled. Aka a valve lash adjustment problem, or a Bent valve
The EGR valve takes unburnt gas vapors from the exhaust and sends it back through the intake manifold to be burnt. The EGR valve takes unburnt gas vapors from the exhaust and sends it back through the intake manifold to be burnt.