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spark plug issue

Started by bassboss, May 31, 2010, 10:38:30 AM

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0 Members and 2 Guests are viewing this topic.

bassboss

I'm looking for some input or some knowledge from anyone who knows a bit about spark plugs. I had something happen to me I have never seen before. I have a 175 evinrude XP. This past spring I did my usual run the boat a few times to clean out the fogging and winterization fluids. The first time out I could only reach about 4000 rpm, not quite enough to plane out but it was trying. Then, my rpm's came back up like one of the cylinders fired up and I could get up to my 60 mph. Ran fine. This happened again but did not recover. I pulled the spark plugs and found one of them physically could not fire. The ground electrode and the center electrode were touching, like the piston had hit the plug. I purchased 6 new plugs, turned the key fired right up rpm's right up there, idles smooth as could be. Pulled all 6 plugs, fine, not a scratch. ANY IDEAS?

1javelin

Was there damage to the plug you pulled?  It sounds like you accidentally collapsed that one plug before you put it in somehow, probably when fogging the inside.  I would consider having a pressure check done just in case.

1jav
Live to fish, Fish to live.

bassboss

Well, everything checks out fine... I dunno. The only thing that concerns me is these plugs have not come out since last spring and it has always run fine. The only other thing I can think of is a heat issue in the particular plug (had one in my car once) or someone messed with it late last fall and I didn't notice the poor firing. Either way, runs good now.  8)

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