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Ugg so annoyed!
was planning on changing plugs today on my wife’s 2012 E350 119k on the clock
Had everything ready. Was following the pdf posted on this site.
got everything off and cleared and started on removing the #6 coil...well it literally pulled in half!
The lower boot was still attached to the spark plug and the top of the coil came off...try as I could I could NOT remove that plug boot.
Good thing those coils are held down with the e-torx bolts....I was able to squeeze it back together and re-bolt the coil back on...put everything back together and gave up.
So annoying that $45 worth of plugs are going to cost me hundreds of dollars for a shop to do.
And now I guess I should buy a couple coils too just in case.
Hopefully whoever designed this this engine gets crabs!
Maybe it would help to spray down each coil spark/ plug area with some Aero Kroil penetrant with the hope that some would make it's way into the spark plug boot and loosen things up Let it sit overnight and give'em another blast or two and let it sit awhile again. **Don't spray it on a hot engine/ exhaust manifold as most penetrants are flammable.
Ugg so annoyed!
was planning on changing plugs today on my wife’s 2012 E350 119k on the clock
Had everything ready. Was following the pdf posted on this site.
got everything off and cleared and started on removing the #6 coil...well it literally pulled in half!
The lower boot was still attached to the spark plug and the top of the coil came off...try as I could I could NOT remove that plug boot.
Good thing those coils are held down with the e-torx bolts....I was able to squeeze it back together and re-bolt the coil back on...put everything back together and gave up.
So annoying that $45 worth of plugs are going to cost me hundreds of dollars for a shop to do.
And now I guess I should buy a couple coils too just in case.
Hopefully whoever designed this this engine gets crabs!
I dont want to beat a dead horse however there is a reason to pull on the designated tab on the boot. I have done four M276 plugs to date and #6 is a b***** however if you can wrap a string/ rope around the pull tab, this would never happen. One time I was even able to carefully squeeze in some channel locks and leverage against those metal brackets in there and pop the boot off. Official MB procedure is to remove the intake manifold, however if you are careful it can definately be done without doing so.
I dont want to beat a dead horse however there is a reason to pull on the designated tab on the boot. I have done four M276 plugs to date and #6 is a b***** however if you can wrap a string/ rope around the pull tab, this would never happen. One time I was even able to carefully squeeze in some channel locks and leverage against those metal brackets in there and pop the boot off. Official MB procedure is to remove the intake manifold, however if you are careful it can definately be done without doing so.
I noticed the pull tab...but it seems like a rope would slip off it, maybe I should have tried that. I was able to get my hand around that tab and yanked as hard as I could, but it was really stuck on there, and at that point I was too worried I had killed the coil and just wanted to make sure I could get it back together first. Maybe I'll order a couple of coils to have as a spare and try again, this way if i Kill one I'll have extra.
How hard is it to remove intake manifold? I know there's lots of vacuum hoses coming off it and it seemed too daunting a task.
I noticed the pull tab...but it seems like a rope would slip off it, maybe I should have tried that. I was able to get my hand around that tab and yanked as hard as I could, but it was really stuck on there, and at that point I was too worried I had killed the coil and just wanted to make sure I could get it back together first. Maybe I'll order a couple of coils to have as a spare and try again, this way if i Kill one I'll have extra.
How hard is it to remove intake manifold? I know there's lots of vacuum hoses coming off it and it seemed too daunting a task.
You may have to pull the off the injectors and rail. Not sure, but that has been my experience.
I'm attaching a PDF with procedure for changing spark plugs on the M276 engine, was this the one you used as guide?
Yep..that's exactly what I was using.
And as recommended I started with #6.
My car has considerably more miles that the one in the PDF so things were a bit more "crusty"
Also looking at the homemade "puller" again I would say that's just about where I was holding the coil to remove it, so it's possible It would have happened anyway.
I'm ordering a couple coils from FCP today and will try again...worst case scenario I'll use some vice-Grips on the #6 boot to yank it off.
You may have to pull the off the injectors and rail. Not sure, but that has been my experience.
I don't know about the E350 but on my E550 the intake manifold comes right up after releasing the wire clip in the middle holding it down right at the intake hole and pulling the two air ducts off at the front. No need to touch fuel rail or injectors.
I don't know about the E350 but on my E550 the intake manifold comes right up after releasing the wire clip in the middle holding it down right at the intake hole and pulling the two air ducts off at the front. No need to touch fuel rail or injectors.
Its NOT the intake manifold that you are describing, what you are removing is the engine cover.
So I saw on FCP that the lower boot to the coil is available as a stand alone part. Guess they’re designed to come apart.
anyway I ordered a couple extra lower spark plug boots (genuine Mercedes) along with some aftermarket coils (boot and coil included)
I’m going to try again next weekend and use some vice grips to yank the boot off. I’ll be sure to grease up the boots when reinstalling.
04-27-2019, 07:50 PM
