M275 Coil Pack woes
Thread Starter
Junior Member
Joined: Jul 2014
Posts: 46
Likes: 10
From: WA
2005 CL65 AMG / Eurocharged ECU/TCU tune / Weistec meth injection + Weistec BOVs.
M275 Coil Pack woes
After installing a Eurocharged tune, my 03 CL600 began misfiring on cylinders 1 and 9 along with a code for "random/multiple cylinder misfires detected". I'm assuming the codes are correct and I need to have both coil packs repaired as 1 and 9 are on different modules. Does the 3rd code indicate the control module for the coils has an issue?
I'd love to have a permanent fix in the form of a lifetime warranty. I saw in another m275 related thread that BWD was offering a lifetime warranty, but I checked their site today and their offering has been reduced to a 6 month warranty..
What would you guys do in my situation? Any insight would be greatly appreciated.
I'd love to have a permanent fix in the form of a lifetime warranty. I saw in another m275 related thread that BWD was offering a lifetime warranty, but I checked their site today and their offering has been reduced to a 6 month warranty..
What would you guys do in my situation? Any insight would be greatly appreciated.
Last edited by dgibs; May 25, 2016 at 09:28 PM.
MBWorld Fanatic!
Joined: Aug 2013
Posts: 1,077
Likes: 80
From: Anchorage
05 CL65
Most of the old coils fail within a short time after a tune, so if you are still on 13 year old coils I'd start by replacing both coils and adding a fresh set of spark plugs while you are at it. If you don't, you are just postponing the inevitable. I haven't seen any people complain about the newer coils failing so I think you should be good for a decade or so. If you are still having misfire issues, you can replace the module later, but I bet you will be fine with just a set of coils and plugs.
Thread Starter
Junior Member
Joined: Jul 2014
Posts: 46
Likes: 10
From: WA
2005 CL65 AMG / Eurocharged ECU/TCU tune / Weistec meth injection + Weistec BOVs.
Most of the old coils fail within a short time after a tune, so if you are still on 13 year old coils I'd start by replacing both coils and adding a fresh set of spark plugs while you are at it. If you don't, you are just postponing the inevitable. I haven't seen any people complain about the newer coils failing so I think you should be good for a decade or so. If you are still having misfire issues, you can replace the module later, but I bet you will be fine with just a set of coils and plugs.
Member
Joined: Oct 2015
Posts: 136
Likes: 29
2015 S600, 2014 E550 4-Matic
Look at the warranty on the rebuilt coils. I repaired mine myself and it lasted about as long as the warranty period before developing additional issues. I'd just buy a new coil pack... you can get them for under $1000 from Autozone if you order them online with the 20% discount. The right side has a lifetime warranty, and the driver's side has a 2 year warranty. They're both the new revision of the Temic OEM coil packs.
Newbie
Joined: Jan 2015
Posts: 5
Likes: 0
From: Dallas, TX
2006 S65 AMG, 2011 Range Rover SC, 2003 F250 Superduty
I experienced the same issue of my original coil packs failure immediately after installing tune. I replaced with brand new units (780 & 680 new part numbers) and no issues since. (also found that Autozone "Duralast" no longer carry the coil packs even though they are shown on the web site).
Super Member
Joined: May 2015
Posts: 554
Likes: 37
2004 S600
I bought mine from FCP Euro. They were a little more expensive than some of the auto parts stores, but FCP puts a lifetime warranty on anything they sell and they have always been top notch when I have a question or problem. Also, everything drop ships direct from Mercedes-Benz USA so there's no doubt you're getting genuine parts.
For what it's worth, mine also failed shortly after a tune. Don't know if they mess with the dwell or if just the higher cylinder pressures put more stress on the coils.
For what it's worth, mine also failed shortly after a tune. Don't know if they mess with the dwell or if just the higher cylinder pressures put more stress on the coils.
