Amgman1998
New Registration
- Joined
- May 31, 2023
- Messages
- 1
- Reaction score
- 0
- Your Mercedes
- C63 S w205 2016 4.0l v8
Car: 2016 Mercedes C63 AMG S saloon. 4.0L v8 biturbo
What happened
What was done:
Where im at now:
What happened
- Car was misfiring once while in garage while low on fuel. Was refueled, left alone for a day and turned on without a misfire.
- Took car home, after a week, misfired again and engine management light came on. The misfire was quite bad, car was very juddery, especially when accelerating, and the car much louder than usual, even without the sport exhaust on.
- Left car alone for a week before taking to my mechanic. Mechanic diagnosed misfiring on cylinder 5 & 6. Mechanic swapped around the spark plugs with cylinders on 1 & 2 to see if misfiring swapped sides. No difference. He then swapped the ignition coils over, and the misfiring DID swap sides, to cylinders 1 & 2. He said it must be my coils and i was instructed to order a new one.
What was done:
- I ordered a new ignition coil along with 2 new spark plugs (Mercedes V8 so each coil has 2 plugs) just incase.
- Took car back to the garage, where all was fitted.
- Now, just cylinder 2 is misfiring.
- My mechanic once again swapped the coil from 1 & 2 to the side with 5 & 6. The misfire was now back on cylinder 5.
- Mechanic suspects the coil was either not new or part damaged and instructed to try buy another one.
Where im at now:
- I followed my mechanics instructions, and sourced a 2nd replacement coil (Used in this case). The misfire is the same, just on one cylinder, and still follows suit when we swap it over to the other side of the engine.
- I am starting to believe that the chances of me ordering not 1 bad coil, but 2, is very unlikely. I would order brand new from Mercedes, but they’re on back order with an estimated 4 month wait. Theres another for sale i can buy tomorrow, but is there any point?
- The car does not run terribly, but it does judder a bit when accelerating at low revs, and also occasionally drops power for half a second before regaining. I have not driven the car hard while in this state. It is not as loud any more on start up or while running it, as it was when there was 2 cylinders misfiring.
- In my head I’ve ruled out the spark plugs. Question is, what are my options? Try one final replacement ignition coil? What else could the issue be? Fuel injectors? I just want the car running at 100% again and im fed up to be honest. Ive been reading a million different things and losing my head over what to do next
- I should add, i am not being charged any labour from this mechanic, as he and my father were very good friends and my dad did him many big favours in the past, so he is not shafting me for cash, and the quicker this gets fixed, the better it is for him.
- Sorry for the long post, any suggestions or insights would be greatly appreciated.
