I am new to this so I hope I use the correct format?
My wifes car is a 1998 E320 W210 Auto, a few weeks ago I had to replace both Cats & the rest of the Exh. system.
Since then I have had an engine rocking from mild to heavy & had a Merc Diagnostic which indicated a problem with Cyl.6 & Cyl.3, a 'friend who is a 'Merc Tech' said it was the MAF, which I changed, this did not work, next suggestion was both leads for 6 & 3, nothing!
I then replaced the remaining leads on my own & still no luck, by the way all plugs have also been replaced, trying to understand why I was having this problem, I then pulled off each coil pack connector while engine running (apart from No.3 as I could not access) & when I got to No.6 there was no change in the engine note.
Thinking this indicated this coil pack, I replaced it only to find I still had the same problem? During the course of all this I noticed that the engine, when revved, spluttered which I had not noticed driving!
I am now down to thinking that if, as I had been told, there is a limp mode, then maybe it is No.3 coil pack that is the problem & this shuts down No.6?
Also, as this all happened following the Exhaust/Cat replacement, is it related? I am positive it is not engine mounts as stated on many American Sites.
So far this has cost me over £1500 & I need some help & advice on this as I am limited as to what I am able to physically do, and if I do need to go to a main dealer, I am probably going to end up paying out another Grand or so!