@Sterron6 - hey, seeing as you stated this started happening after you changed the ignition coils and spark plugs, on certain Mercedes/ direct injection engines, the spark plugs need to be "clocked" a certain way. I would reverify they are all installed/torqued correctly.

Also, you could of gotten a bad ignition coil or spark plug? I've heard of that happening before.

I'm leading in that direction because you said you didn't have these issues until after you performed that work.

Keep us posted on what you find.

Ant

 

@Sterron6 - hey I was thinking about this again. I agree with Tim leading to a wiring, fuse, relay issue or a bad ignition coil or spark plug. Or the spark plug is not clocked properly.


anyway… I was also curious if you noticed any oil when you pulled the ignition coils /spark plugs? I was thinking if those gaskets failed you could be getting oil leaking onto the spark plugs and coils. Causing the misfires and codes.

there are individual valve cover gaskets around each spark plug that can fail. Just a thought


ant

 

a
Spark plug clocked? I've never heard of that before,but I'll for sure look into it. Yes the car was running fine, but started to give me issues with misfire before the repair. I replaced all 4 coils and gave it a drive and everything seemed ok.I drove it to work the next day,but then the misfire started again after a 15 minute drive on the express way. The misfire isn't constant at idle, but when I press the gas it starts to misfire continuously. KINDA LIKE A FAULTY o2 sensor. I'm getting codes "p0300,p0301,p0302,p0303,p0304.

 

no oil on plugs. I'll refocus my attention back to the coils. I'd hate it to love it if that's the issue because I've replaced a few parts after replacing the coils thinking that it would solve the issue. It would be so bitter sweet if those so called "New" coils are faulty 😡😑😌

 

Did you ever find the issue. I believe we are having the same issue. After alot of part pitching and waisted time I believe I've found the culprit.😏

 

happy to say I found the problem😌

 

FOUND THE ISSUE..YESSSS!!!

 

Well, what was it?

 

Let me start by saying that his has been a pain in tha a$$. I threw a bunch of parts out there and also a bunch of bucks. During the time that ive been working with this vehicle and the numerous of times that i connectect the obdII scanner I only can say that i seen codes (p2008, p2015,p2016) once then they went away and never returned until the other day. I've heard that the car vehicle should be at its operating temperature before getting a proper reading WRONG in my case. In certain cases when the car is at operating temp it enters "I/M Readiness" and from my understanding its difficult to track down the issue after in enters that state. That battery was unplugged for a few days so i connected the battery of course and then connected the the scanner and started the vehicle and let it run for about 10 seconds. I turned the vehicle off disconnected a d reconnected thw scanner and switched the key to the on position and thats when gor the codes. Checked the intake and there was the problem
Turned out to be that the intake manifold swirl flaps are broken from the actuator shaft. I checked for vacuum leaks, cracked or broken hoses, and replaced all fuel injectors while removing and putting back on the intake every time. Hate that I overlooked the issue more than 3 times, but I'm happy that I found the Issue. I hope that this helps someone else.

 

There seems to be a lot of separate postings about broken flaps lately. Wondering if the 10-12 year mark is when these things happen.