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Old 04-09-2007, 04:13 PM
nogoodscallywag nogoodscallywag is offline
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Re: spark plug denting

snupytcb said: are you trying to compress water. depending on the motor head gaskets are known to go bad.

A:if the head gaskets are bad wouldn't the engine idle rough as well as drive rough? I have no power loss, no noise, no check engine light until my spark plug is hit over 3000 rpm, and it doesnt do this all the time. it had happened 3 times now and rarely do i press it past 3000 rpm. when it did hit it then came with the sound, loss of power, etc. then i fix the gap and everything was back to normal.

bobss396 said: Since this is peculiar to the one cylinder, my best guess is that you broke one of the top ring lands on the piston. The loose piece is bouncing around the combustion chamber and once in a while manages to get compressed.

Now you say that the plug tends to foul, you might have even broken a piston ring. I predict that once this motor is taken apart you'll find a broken up piston in the suspect cylinder, cylinder scoring and the rings will no longer be in one piece. The other cylinders may have latent damage which should show up in a visual inspection.

A: I am not sure about a loose piece. the plug has never been compressed when under 3000 rpm at all. i would think that a piece popping all aroudn inside would mean a condition would occur at all times, not just intermittenly and over 3000 rpm... i could be wrong of course. i appreciate all the ideas and suggestions and am looking into it.

maxwedgy said:

You came here for a technical issue, who cares about the other points you raised, something is damaged in that cylinder, the use of nitrous points to detonation especially repeatedly flattening the plug, based on your obvious inexperience in this area maybe you should heed the suggestions posted! It only happens above 3k because that is when the rod starts to stretch slightly, causing some interference, pull the head and look!

A: Yes I did come here for a teceh issue, and who cares indeed about the other points. You had brought up the point that I should not be driving a car "a way" so you brought it up. No shit something is damaged i am trying to figure out what excatly. And if you read what i actually said, I NEVER HAD NITROUS DETONATION flatten a spark plug. Get this out of your head. I had not run nitrous since August. No problem until Late December with the spark plug being flattened. I am indeed inexperienced but at the same time am not stupid. I am fairly knoweldgable about engines but came to this forum to get ideas about the problem, not people telling me a car should not be driven in such ways when it was bought for such purposes to begin with. On top of that, you do not rea what I stated the symptoms were. And as I stated in my first post, I think the problem may be a connection problem with the piston connection to the rod but am unsure exaclty how the two are connected, so you aren't offering any help. The other guys on here offered their suggestions and said nothing of whether or not a car was supposed to be driven in this way blah blah blah.

Please remember that I never once experienced any engine problems while running nitrous. I took off the nitrous as I usually do in the winter when I don't run the car. It was off in August. I did not experience spark plug problems until late December. I do not run nitrous so the nitrous is not the direct cause of the piston or whatever hitting the tip of the plug, but it may very well in my opinion be the long term cause of a connection problem with the rod and piston...
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