You can't really check a spark plug unlessyou have a high tension supply and a pressure chamber. A spark plug may fire at ambient pressure but will not fire inter cylinder compression. The only test is to try the machine with a new spark plug or a used one that is known to be working.
Answers & Comments
You can't really check a spark plug unless you have a high tension supply and a pressure chamber. A spark plug may fire at ambient pressure but will not fire inter cylinder compression. The only test is to try the machine with a new spark plug or a used one that is known to be working.