AMG WORLD

I have the solution to your w221 problems. Most common problem is Misfiring or open injector circuit on 1,5,6,7,8 if you do have this problem i know the solution to it.
Also if you have any other problem regarding this model year please message me and will be more than happy to help!

Rahbrx7

have that issue with 07 s550

Just204

Something got messed up, usual suspect is a bad MAF sensor but your pics show a MAP sensor, I didn’t think modern non turbo cars used them any more.

Waqas Umar

i am facing this issue since last 2 days, error popped up when connected to computer stating 7th cylinder open circuit and misfire detected. Got ignition coils inter changed between no. 6 and 7 but it came back after I drove a few miles. Got 7th cylinder misfire error again, got spark plug changed and it went away. But later at night when I tried starting the car, it didn’t start up on the first try. Car seemed to try starting up but failed and all lights on cluster lit up. Would really appreciate a help

Wstone

Please help me with my misfire on bank 5,6,7,8 after changing just about everything from control unit, spark plugs, ignition coils, fuel injectors, fuel pump and filter, still running rough and showing misfire codes.

T.H.Carrera

Check your O2 sensors.

Wstone

Thanks that’s my next step.

T.H.Carrera

Also, if you have had misfires with the car shakes and foul smell after you have replaced sparks then the ones that are in the misfire range have probably turned black. So once you figure out the problem then you should clean those spark plugs. O2 sensor saying ”not ready” even occasionally is on its way out and can cause this issue you are experiencing.

Paul Wright

MY 07 S550 is misfiring three coils but after changing spark plugs and coils nothing happens. It idles perfectly for 5-10 mins but when driving it shakes bad and cuts off. What do I do?

mike schaef

c

Noise123

[QUOTE=AMG WORLD;6977759]I have the solution to your w221 problems. Most common problem is Misfiring or open injector circuit on 1,5,6,7,8 if you do have this problem i know the solution to it.
Also if you have any other problem regarding this model year please message me and will be more than hap

poptopclk

This is what my misfire on 5,6,7,8 looked and sounded like.
was a collapsed catalytic failed converter.
confirmed by removing an O2 sensor and noticing less back pressure.
It was a replaced catalytic converter that resolved it 100%

Jwanko77

I have a 2007 mercedes benz s550 it just started yesterday... Started the car and it was barely running like all plugs went bad at the same time, code reader said multiple misfires on cylinder 7, 8 3, 4,.... I took off the engine cover and noticed that the screen on the maf sensor was damaged so I removed it and the car started running perfect again. Next day I installed a brand new maf sensor and it was fine until a few hours later it started the same thing with multiple misfires.... Now it keeps doing it off and on..... First runs perfect then not??.... Sorry for the long message, please help.

Manucanada

Please help I have this problem, I already changed spark plugs and coils and still the same

jimmychu

can you help me i have that problem multiple misfires. already replaced spark plug coils maf sensor still running rough.
thank you