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DIY: Change your own coilpacks (Thanks JVakos, Vrodman)
Take a look and a listen, JVAKOS and VRODMAN please give input as well!!
I've replaced my plugs (on OEM plugs stock gap and had OEM plugs at 0.022) and was still getting misfires on my AMS dyno tune. I added 100 octane it didn't help. JVAKOS and VRODMAN, my brosefs from different mosefs, told me to replace my coils. Voila... so far so good. the coils were $50 each and this is SUPER EASY to do.
M157 coil pack connector - pull back the exposed grey plastic tab and then use a small flat head screw driver to insert inside the connector from the side and put it under the grey plastic tab to release it and the connector should come right off M157 coil pack connector - pull back the exposed grey plastic tab and then use a small flat head screw driver to insert inside the connector from the side and put it under the grey plastic tab to release it and the connector should come right off M157 coil pack connector - pull back the exposed grey plastic tab and then use a small flat head screw driver to insert inside the connector from the side and put it under the grey plastic tab to release it and the connector should come right off M157 coil pack connector - pull back the exposed grey plastic tab and then use a small flat head screw driver to insert inside the connector from the side and put it under the grey plastic tab to release it and the connector should come right off
PeterUbers - super job on this DIY!!!
anyone who has misfires should review this and start with the easy coil pack swap to temporarily fix your misfire until you can get a new coil.
cylinders 1 and 5 are the most common misfire cylinders as they’re located in the front on each bank (closest to front bumper) and due to their placement next to the turbos and they get exposed to a tremendous amount of heat especially for tuned motors pushing 18-20psi boost.
You can swap cyl 2, 3 or 6 or 7 coils which are not next to the turbo and don’t take as much heat with the 1 and 5 coils to test if the coil is your issue (if it doesn’t fix it you may need new plugs or get your injectors checked or bigger problems that are way out of my league to attempt to comment on!!)
Take a look and a listen, JVAKOS and VRODMAN please give input as well!!
I've replaced my plugs (on OEM plugs stock gap and had OEM plugs at 0.022) and was still getting misfires on my AMS dyno tune. I added 100 octane it didn't help. JVAKOS and VRODMAN, my brosefs from different mosefs, told me to replace my coils. Voila... so far so good. the coils were $50 each and this is SUPER EASY to do.
PeterUbers - also was interesting that the cyl 5 misfire following your AMS 93 oct tune was intermittent and adding 4-5 gallons of 100 octane was temporarily a fix for the misfire probably because of the slightly reduced knock and heat that 100 provided mixed with 93. that obviously didnt last forever and the #5 coil weakened due to the added heat PLUS the fact that the 2014 models had a different coil (which you articulately explained in the video!!!) which was improved in 2015+ with a new MB part for the coil which apparently is more substantial with its heat protection..... again i'm an amateur but know many guys have these misfires and seems weak coils combined with bad plugs (or bad fuel!!!) can be the culprits!!!
agreed on the 100 octane improvement and i agree with your hypothesis. I truly hope the coils will help me as the FIRST THING that AMS tuning told me when I got tuned is that if I have CEL's, look to the coils as they are weak on this tuned platform.
your trick to getting the coil plug/harness off was INVALUABLE and must be clearly understood or you will not accomplish this ridiculously easy DIY
Last edited by PeterUbers; Jun 4, 2020 at 10:10 PM.
Great works Peter and to all you guys! These are great posts to see in our community! This is why this forum is so great!
Few points that may help:
Coils were changed or the boots, late MY2014 it seems. My car is a March build and it has the “updated” boot design. May be hit or miss for some engines aswell, Mercedes sells both, boot designs today.
If you have the “updated” boots P/N 276 159 02 42, they have a small notch on them where you can slide a piece of wire preferably, since you can shape it, and pull up on the coil without damaging anything. Very simple and easy. Here is an example i did with some rope
Another overlooked item is using the oem benz boot grease, so the plugs go on and come off easier in the future:
p/n 002 989 80 51 09 The grease is neon green and just a small bit on the end of the boot helps. This grease does dry up with age but it cant hurt to try and help things.
Also I'll be doing 1,7 this weekend... is the passenger side bank of cylinders as easy to get to? And what is the order front to back on passenger side as I look at the windshield from the front bumper?
Also I'll be doing 1,7 this weekend... is the passenger side bank of cylinders as easy to get to? And what is the order front to back on passenger side as I look at the windshield from the front bumper?
peter - You are correct one through four on the passenger bank and five through eight on the driver side bank.
thanks!! Just changed 1,7...I timed it and it took me 8 minutes thanks to jvakos' tips ....and the passenger bank of coils is even easier to get to than the drivers bank
continued AWESOME SAUCE!!!
no cel and prodigious power!!!
Last edited by PeterUbers; Jun 8, 2020 at 12:56 AM.
thanks!! Just changed 1,7...I timed it and it took me 8 minutes thanks to jvakos' tips ....and the passenger bank of coils is even easier to get to than the drivers bank
continued AWESOME SAUCE!!!
no cel and prodigious power!!!
would suggest making this DIY from PeterUbers a STICKY as these w212/E63 cars are getting older and coils become the weak link contributing to CEL's especially in 2014 or earlier models with the old coil pack part number.
great job to document this PeterUbers and I have bought 8 extra OEM Beru coil packs for my 2015 that I'll use to replace the existing ones when swapping them around no longer fixes any misfire issues.
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