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P307 Cylinder 7 misfire, help

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Old Jul 30, 2012 | 04:13 PM
  #11  
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#5 is a pretty common place for the plenum gasket to leak. And the pcv is right there too.
 
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Old Jul 30, 2012 | 05:48 PM
  #12  
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Ok problem solved, Pulled plugs 5 and 7 one more time. Both have hairline cracks in the ceramic insulator. Sent both back for warranty before I took a picture but I do not think it would have shown up. What I do not understand is why # 5 never showed a misfire on the scanner? Thanks for all the help and suggestions.
 
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Old Jul 30, 2012 | 07:36 PM
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Some cracks are worse than others. Did new plugs cure the miss?
 
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Old Jul 31, 2012 | 11:17 AM
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Yes, it cured the problem. New does not mean good. And being complacent, never pulled the plug out of the socket. Electrode was good, nice tan color, never thought to look at the ceramic.
 
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Old Jul 31, 2012 | 01:49 PM
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I like cheap fixes.
 
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