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  #1  
Old 06-01-2012, 01:32 PM
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Default Spark plug damage - ceramic breaking.. what would cause this?

For the second time, I have discovered an issue with a plug. I was getting a P0304 code, misfire on #4 cylinder. When I pulled the plug, I found the ceramic on the center electrode damaged, thus, I thought there was a misfire to the head...

I used the compression of the cylinder to push out any piece(s), leaving the plug out and cranking it over.. although, I was not sure if anything was pushed out...

Replaced all the plugs, NGK-ZFR6F-11G 6987, which was the same as what was in the engine. I have had the ram for 6 months, 2002 1500 with the 4.7 and 130K.

After a while, the code came back.. I swapped coils and the injector, as it seemed I was getting a hydro-lock situation, and the only code P0304. I noticed a lot of white smoke when I was able to start it up after the hydro-lock.. Appeared to be flooded.. replaced the plug for the second time, and so far no code, no starting issue...

Anyone know what might cause the plug to fall apart?

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Old 06-01-2012, 01:54 PM
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That is strange. Obviously it could be poor quality of the plugs, but since it's happened twice that's doubtful, and NGK is known to be pretty good.

I really don't know. Other than verifying that they are the plugs that should be in there(oem), I'm not sure what to suggest.
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Old 06-01-2012, 02:07 PM
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That cylinder is getting to hot for some reason....you need to compression check the cylinders.
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Old 06-01-2012, 04:42 PM
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Red face Hmmm

it can be caused by a very lean cylinder, overheating the plug and causing the porcelain failure. Try a compression or leakdown test, look for any open hoses to that area , maybe even check thte plenum gasket?
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Old 06-01-2012, 08:24 PM
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im sure you did, but id double check that you are running the proper heat rated plug.

http://www.ngk-sparkplugs.jp/english...q03/index.html
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Old 06-02-2012, 07:23 PM
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Default The result..

The white smoke was the clue..

During the compression check, she spouted like a volcano... the cylinder was full of anti-freeze... thus the Head Gasket... water being introduced into the hot chamber will cause the ceramic to break..

Goatman
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