S65 bogs down when accelerating
Thread Starter
Newbie
Joined: Dec 2021
Posts: 9
Likes: 3
2007 Mercedes S65
S65 bogs down when accelerating
2007 S65 starts and runs fine until I give it peddle to kick in the turbos then the engine bogs down , runs very rough until I stop and restart it, then it runs just fine again. Odd thing is I can slowly accelerate up to 80 90 100 and more it she runs fine. Only when nail it from say a 50mph punch then it happens...engine light will come on and I scan codes and it tells me multiple misfires.
Super Member
Joined: Nov 2016
Posts: 603
Likes: 275
From: NYC
S63, GLE580, BV250
99% sure its the coil packs, common on your generation s65. Below link will take you to the right forum, do a search or put out a fresh post and i'm sure you will have more people chime in with a better diagnosis.
https://mbworld.org/forums/s55-amg-s...-w220-w221-52/
https://mbworld.org/forums/s55-amg-s...-w220-w221-52/
MBWorld Fanatic!
Joined: Mar 2017
Posts: 1,350
Likes: 493
From: Birmingham, AL
2019 S560, 2022 Audi S8
2007 S65 starts and runs fine until I give it peddle to kick in the turbos then the engine bogs down , runs very rough until I stop and restart it, then it runs just fine again. Odd thing is I can slowly accelerate up to 80 90 100 and more it she runs fine. Only when nail it from say a 50mph punch then it happens...engine light will come on and I scan codes and it tells me multiple misfires.
Thread Starter
Newbie
Joined: Dec 2021
Posts: 9
Likes: 3
2007 Mercedes S65
Here's an update on my S65...the coil on # 7 cylinder was toast, the coil tubes for # 7 were scorched inside. Another issue my tech found was wrong plugs were installed when the coils and plugs were changed just prior to my buying the car. Go Figure!! The plug they used was NGK BKR6EGP...this plug is meant for Toyota Honda and the like, not a HYPO engine such as S65....NGK IFR6QG....he replaced the coil and all plugs....1500 miles later all is still good
