Quote:
Originally Posted by edasmus
Thanks Walter and yes this does help.
The behavior of number 5 on the rear engine is somewhat interesting to me. I'm not sure what to think. About every 20 hours or so I will lose number 5 on the right mag, rear engine. I do ignition checks at altitude and today was the day that number 5 dropped off on the right mag.
My M/O is to just pull both plugs (because I never knew if it was the top or bottom plug), clean them up, test them (always test good), put them back in and go fly. The problem goes away for 20 to 25 hours and then reappears. The eleven other cylinders do not do this but it is always number 5 on the rear. I think last time I rotated the plugs in number 5 to see if the problem would follow the plug. It appears it did not but I can't remember for sure if I did in fact rotate the plugs. Needed to take better notes as it was about 4 months ago.
Anyway, tomorrow the top plug on number 5 is getting replaced with a brand new one and I'll see what happens.
Thanks Walter.
Ed
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What you are experiencing is the incipient failure of the plug. I have a bushel basket full of plugs that are bad, but TEST good on a bomb test. Replacing plugs that act like this at your earliest convenience is a very good idea.