Misfire on Cyl 4
Thread Starter
Super Member
Joined: Jan 2009
Posts: 566
Likes: 261
From: In The Woods
2019 W222 S560 4Matic/2025 Yukon Denali
Misfire on Cyl 4
Hi All,
my 2019 s560 (4.0tt) got a misfire on cyl 4.
car has 91k on it.
started it up to leave the office and it sounded like an AMG.
Shook very badly when I gave it gas (load)
drove it home (very light on the pedal)
Shut the car off for a while, no misfire.
ran xentry, cleared codes.
Took the car out again, no misfire.
it has also been under 10dg here for the last week….
where do I start my diagnosis?
my 2019 s560 (4.0tt) got a misfire on cyl 4.
car has 91k on it.
started it up to leave the office and it sounded like an AMG.
Shook very badly when I gave it gas (load)
drove it home (very light on the pedal)
Shut the car off for a while, no misfire.
ran xentry, cleared codes.
Took the car out again, no misfire.
it has also been under 10dg here for the last week….
where do I start my diagnosis?
Last edited by vinflouen; Jan 23, 2025 at 06:28 PM.
MBWorld Fanatic!
Joined: Feb 2017
Posts: 2,315
Likes: 1,215
From: Baltimore County, MD
'13 s212 63 p30. '06 LX470
Hi All,
my 2019 s560 (4.0tt) got a misfire on cyl 4.
car has 91k on it.
started it up to leave the office and it sounded like an AMG.
Shook very badly when I gave it gas (load)
drove it home (very light on the pedal)
Shut the car off for a while, no misfire.
ran xentry, cleared codes.
Took the car out again, no misfire.
it has also been under 10dg here for the last week….
where do I start my diagnosis?
my 2019 s560 (4.0tt) got a misfire on cyl 4.
car has 91k on it.
started it up to leave the office and it sounded like an AMG.
Shook very badly when I gave it gas (load)
drove it home (very light on the pedal)
Shut the car off for a while, no misfire.
ran xentry, cleared codes.
Took the car out again, no misfire.
it has also been under 10dg here for the last week….
where do I start my diagnosis?
Thread Starter
Super Member
Joined: Jan 2009
Posts: 566
Likes: 261
From: In The Woods
2019 W222 S560 4Matic/2025 Yukon Denali
A weak coil pack could start to be flaky in cold weather.. if you’ve not replaced them with 91,000 miles, it’s definitely time to do those and the plugs, and you can boroscope the cylinders while you’re in there. You can look at injectors in xentry, but if you’ve never run any Techron or redline through it, it’s probably a good idea too.
i did the plugs at 50k and was planning on doing them in the next month.
i run bg44k every 6 or so months.
I also try to fill up with sunoco 94.
tuned with Renntech (over 2 years with the tune)
Here is the readout from xentry
thanks for the feedback.
Last edited by vinflouen; Jan 23, 2025 at 07:38 PM.
Senior Member
Joined: Mar 2010
Posts: 290
Likes: 48
From: Florida
2013 ML350, 2019 S560
Hi All,
my 2019 s560 (4.0tt) got a misfire on cyl 4.
car has 91k on it.
started it up to leave the office and it sounded like an AMG.
Shook very badly when I gave it gas (load)
drove it home (very light on the pedal)
Shut the car off for a while, no misfire.
ran xentry, cleared codes.
Took the car out again, no misfire.
it has also been under 10dg here for the last week….
where do I start my diagnosis?
my 2019 s560 (4.0tt) got a misfire on cyl 4.
car has 91k on it.
started it up to leave the office and it sounded like an AMG.
Shook very badly when I gave it gas (load)
drove it home (very light on the pedal)
Shut the car off for a while, no misfire.
ran xentry, cleared codes.
Took the car out again, no misfire.
it has also been under 10dg here for the last week….
where do I start my diagnosis?
MBWorld Fanatic!
Joined: Feb 2003
Posts: 1,416
Likes: 342
From: Charlotte, NC
Had: 1987 300TD, Had: 2004 C230 Sport Sedan, Have: 2014 E350 Sport, Have: 2019 S450
I’m betting it’s a coil on it’s way out.
Ww suffered the same issue (intermittent misfire for about a week before total failure) in our W212.
Best to change all of them, as the others will likely be failing at intervals going forward.
Ww suffered the same issue (intermittent misfire for about a week before total failure) in our W212.
Best to change all of them, as the others will likely be failing at intervals going forward.
Thread Starter
Super Member
Joined: Jan 2009
Posts: 566
Likes: 261
From: In The Woods
2019 W222 S560 4Matic/2025 Yukon Denali
Thank you all.
I am going to get me 4 coils tomorrow and I guess it will be another weekend of 'fixin'.....
plugs and coils.....
I have NGK plugs....you have any opinion of them over the OE MB plugs?
I am going to get me 4 coils tomorrow and I guess it will be another weekend of 'fixin'.....
plugs and coils.....
I have NGK plugs....you have any opinion of them over the OE MB plugs?
Super Member
Joined: Jun 2003
Posts: 713
Likes: 147
From: Aridzona
'15 S550, '10 E350 P1/P2, '02 ML320
Yeah +1 on the coils. I had my #7 fail and it took several instances of the misfire for it to actually store a code! Finally got the Check Engine light and the resulting code.
*ALSO: If I stopped and turned the engine off and waited 30 seconds it would start and drive like nothing was wrong, until it happened again. No problems in 15k miles since changing all the coils.
*ALSO: If I stopped and turned the engine off and waited 30 seconds it would start and drive like nothing was wrong, until it happened again. No problems in 15k miles since changing all the coils.
Last edited by dlafever; Jan 24, 2025 at 07:27 AM.
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Thread Starter
Super Member
Joined: Jan 2009
Posts: 566
Likes: 261
From: In The Woods
2019 W222 S560 4Matic/2025 Yukon Denali
all done.
4 new coil packs, 8 plugs….
car runs perfect now.
check out the plugs.
42k miles on these.
photo taken as if from front of the car.
look at the 2 plugs with oil on threads….
no leaks visible.
Last edited by vinflouen; Jan 25, 2025 at 04:05 PM.
MBWorld Fanatic!
Joined: Aug 2017
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2019 S560, 2015 Honda Civic Hybrid
I'm going to do mine next week, hope there's no oil on any of them! BTW, did you have to disconnect and take out a high pressure fuel line on the left side? That's mentioned in a video I watched on doing plugs on the 4.0 liter engine ...
Thread Starter
Super Member
Joined: Jan 2009
Posts: 566
Likes: 261
From: In The Woods
2019 W222 S560 4Matic/2025 Yukon Denali
You have to disconnect the battery so the fuel pump is not running, and then disconnect the fuel line on the left.
You cant get the coil out with the fuel line in place.
also on right side, in the back there is another t25 that you have to take off to remove some silver tube to get at that coil.
i had 2 stuck boots….one of them took almost an hour of pulling on to get it out.
all other bolts are 10 and t30.
torque plugs to 23nm.
Thread Starter
Super Member
Joined: Jan 2009
Posts: 566
Likes: 261
From: In The Woods
2019 W222 S560 4Matic/2025 Yukon Denali
Hi All,
I drove about 200 miles so far and no issues.
thank you all for the input.
new plugs and coils and it feels so good!
will be back asking about valve cover gaskets soon die to oil on cyl 2/3 plugs…..
I drove about 200 miles so far and no issues.
thank you all for the input.
new plugs and coils and it feels so good!
will be back asking about valve cover gaskets soon die to oil on cyl 2/3 plugs…..
Out Of Control!!
Joined: Apr 2019
Posts: 11,993
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Speaking of oil forced out to leak where possible:
Have you check CPS for oil??
Out Of Control!!
Joined: Apr 2019
Posts: 11,993
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
CPS... $10k oil leak
yes, camshaft sensors located on engine top at the front... frequently leak oil into whole engine harness ($10k repair).
Easily inspected by unplugging connector while ECU is asleep to prevent fault code.
Easily inspected by unplugging connector while ECU is asleep to prevent fault code.
Last edited by CaliBenzDriver; Jan 28, 2025 at 06:42 PM.
Thread Starter
Super Member
Joined: Jan 2009
Posts: 566
Likes: 261
From: In The Woods
2019 W222 S560 4Matic/2025 Yukon Denali
I dont think so, that seems to be a wiring harness.
this motor 176 does not have it.
also get yourself a radio removal tool in case a rubber boot breaks away from the coil pack when you are pulling it up.
Dielectric grease on spark plug tips are a must.
this motor 176 does not have it.
also get yourself a radio removal tool in case a rubber boot breaks away from the coil pack when you are pulling it up.
Dielectric grease on spark plug tips are a must.
