09' GL450 Cylinder 5 misfire, oil on top of plug

May 26, 2020 | 06:39 PM

nobleeth

Thread Starter

Junior Member

Joined: Sep 2018

Posts: 22

Likes: 2

2009 GL450

09' GL450 Cylinder 5 misfire, oil on top of plug

Hello! I got a cylinder 5 misfire code a couple of days ago and I pulled the coil off today and it was flooded with oil. Like flooded. Then I pulled the plug out and there was oil all over the bottom as well, but my guess is it was just in the top and dripped down when I removed it. The car was not burning any oil and no smoke is coming out of the tailpipe. I cleaned the oil up and put the plug back in and tried it again and now I have Cylinder 5, 2 and 6 misfires (along with a "random/multiple cylinder misfire detected" code) and a rough running engine. Also, my coil pack on 5 was BURNING HOT. Like, crazy hot and the others were cool.

I am thinking it's the valve cover gasket but I have a couple of questions for you amazing, smart, talented people (I'm hoping flattery will help get a reply):

1 - Does that sound like that could be the problem?
2 - Where can I buy a valve cover gasket for this car? I looked on RockAuto, EBay, Amazon, Autozone, etc. and NOBODY has it!
3 - How hard of a job is it? I watched a YouTube video for a different Merecedes and it didn't look all that bad but I couldn't find it being done on a GL450.

May 26, 2020 | 07:46 PM

Max Blast

MBWorld Fanatic!

Joined: Jan 2010

Posts: 3,116

Likes: 782

NGL450 w/EORP, S550

Fcp euro
autohausaz
pelican parts

yeah sounds like a problem - is the oil engine oil? The coils have some kind of fluid in them that leaks out when they self destruct.