spark plug Stem cracked - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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spark plug Stem cracked
Posted by Tim (more from Tim) on Mon, 26 Jul 2010 21:33:04
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Dug into the spark plugs today on my 99 9-3 Vert due to CEL, and found #4 had two vertical crack lines in the ceramic part that is between the threads and the tip at the top where plug meets the contact point deep inside the DI nipple. What could be causing the crack way up in the stem of the plug outside the engine block like this?
The broken plug is an NGK...7. I replaced all four with NGK...6 platinum plugs that were originally purchased for my 9-5, and the car runs fine now without CEL. Is there any harm in that? Do all 4 plugs have to have the same temperature rating or even from the same manufacturer/material?
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