1 ignition coil loose

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Nov 25, 2018 | 02:11 PM

Wuz

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1 ignition coil loose

Hi all, so today I decided to change my air filters took off the cover and just was inspecting the engine. On the right side of the engine the middle coil looks odd. I took a closer look and it was a little out of the spark plug hole. Both screws were completely off too. I took the coil out and there was some dark residue on it. I cleaned it up and put the coil back and screwed it properly. Anyone think there could have been an issue before? There was no misfires and the engine ran fine

Nov 25, 2018 | 04:06 PM

RA72825

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Those screws don't usually back out on their own, so someone was in there. Probably replaced the coil and then closed everything up without putting the screws back into place.

Nov 25, 2018 | 06:53 PM

300SE1993

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2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic

If it screwed in without issue, I think you should be fine moving forward. Makes you wonder what else might be loose though....

Nov 25, 2018 | 06:53 PM

Wuz

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Strange thing is that this was a certified preowned from mercedes.

Nov 25, 2018 | 08:08 PM

300SE1993

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2012 S350 Bluetec, 2014 GLK250 Bluetec, 2026 E350 4Matic

Quote:

Originally Posted by Wuz

Strange thing is that this was a certified preowned from mercedes.

Oh, I've heard some stories about cars that have been sold as CPO. Let's just say some dealers have questionable practices. I even saw at one "good" dealer a $100K CPO car to which they showed me the shop receipt. I noticed that only 3 of the tires had been replaced. Apparently one of the tires met minimum specs (I believe 50% tread or so) so they left it on. On a $100K car!