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Originally Posted by r_p_ryan
okay - this will sound a little strange, but hey - I was right about it not being the gas, and right about the problem being in the ignition so my credibility should be good.
remove the cap and rotor. take a T30 Torx wrench and remove the bolt that lives behind the rotor. Make sure the bolt is completely healthy and then reinstall it. I recently purchased a 300e at a huge discount because the owner had spent thousands at the dealer and couldn't resolve this intermittant problem. The bolt was cracked, which caused the rotor to have a little bit of play. This wore down the contacts and increased the size of the gap. So a new cap/rotor made no difference after a few miles. Check out my DIY on resealing the top timing cover for picks of the bolt and tips on cap removal.
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Yes, I just reviewed my original thread and noticed your posts - you were right on. Unfortunately, it went in one ear and out the other for me, because again I was convinced the secondary ignition components couldn't be the problem (that'll teach me). I guess you just can't rule anything out. I'll have to look at your posts and check out that bolt. Funny - in the course of my search, I think I stumbled across that thread. But again - in one ear and out the other. I think I need to stop cleaning my ears...
I did think the cap and rotor had more pitting than they should for only 15K. If the spacing wasn't consistent, I suppose that could cause arcing.