The main reason why one can face this issue is not sealing the valves correctly. A burnt exhaust valve can also reduce the performance and power of the engine.
Sticky Valves Piper Owner Society
Burnt valve compression test. A leak down test uses a set of gauges and pressurizes the cylinder with air and measures how much of that air is escaping. To check for a burnt valve with a dollar bill or piece of paper is very simple. I have had a rough idle for quite a while. Burnt valves can tend to have huge holes that will leak out all the gases. How to diagnose the cause of a consistent single cylinder missfire. Spark plug wrenchsocket compression test gauge and line air fitting.
This eventually reduces the compression resulting in the poor performance of the engine. 2000 honda accord ex f23a4 long story short car has been burning a good bit of oil for a couple months then cylinder 2 was misfiring code 1399 and 0302. Took it to a honda dealer to get it checked out and was told i have a burnt valve in cylinder 2. Hold a paper towel dollar bill next to the exhaust and if it is getting. Anyways i have decided to do a compression test on my cylinders because i have been told that it will let me know if i have a bent or hung up valve. The test on one side of cylinders was as follows 2 210 4 210 6 210 8 190 i have not done the other side yet.
Exhaust valves are more susceptible to burning because they run hotter than the intake valves averaging between 1200 and 1350 degrees fahrenheit. Doing a compression test on my new motor because i have run into some major problems. Therefore a good way to test for a burned exhaust valve is to run a compression test or leak down test. See my post on broke in cam now popping noise. A compression test uses the engine turning to generate the compression in the cylinder for the compression stroke in which both intake and exhaust valves are closed. Most of the time when exhaust valves are burned they will cause losses in compression.
Gallery of Burnt Valve Compression Test
