Rosta Stehno

Hi everyone.
Could you please help me with sorting out what problem there should be with my car?

I drove it today at noon, as ordinary, for lunch. I drived it not too harsh, not too fast (110 kph I think) and then car suddendly started to "woble" (vibrate) and the engine light became flashing. So I stopped, put car to N, it still vibrated more than usually, even in P. When I turn the engine off and on again, it was ok for some time, even that engine light on cluster went away. But at evening I went home from my work and same thing started again, but the engine problems light is now still ON even after engine off/on cycle.
I wonder what could cause such vibration, especially when car is not moving..

I did not felt any power shortage between those two "incidents" and car felt quite normally as it did before...

Thanks for help everyone.

meazz1

It might be bad spark plugs or coil packs.

gamma300C

Failing MAF ? You should have an error code(s) that can be scanned.

Rosta Stehno

I was in MB service today and there are results.

0064
2381
0629
0649
0637

They told me that this is camshaft chain / timing wheels or balance shaft issue...

I am sad ...

EDIT: I just look for some serial numbers and I am not sad as I was. Mine is 272947 30 662950 which should be behind the range of "balance shaft" issue engines....
Could all this be made by not corectly working camshaft adjustment solenoid? Or is that missfire reason of something else?

Rosta Stehno

nobody any suggestions? :/

gamma300C

Certainly could point towards a bad camshaft position sensor, a well discussed and common failure at least in C300/C350's. Pretty inexpensive and easy fix.

Rosta Stehno

I was in service where we looked thrue the holes for cam sensors at markers on cam wheells. When engine mas manualy turned by hand to right angle, the cam markers on right bank was at centre of holes but left bank was not. We replaced timing chain and timing error code did not appeared yet. Idle is less rough now but sometimes I can feel wobles which they think is missfire from coil 4 and 2. I will let them replace that next week and we will see thanks. I will let you know if that helped...

Rosta Stehno

Ok, guys. Timing problem code 0064 was solved by replacing timing chain which was stretched. Today, they also replaced ignotion coils 2 and 4 (alteast they told me it was those two) and its better. There is no more CEL, fuel consumption went down to what I suggest is normal but when idling, the cylinder 4 is still missfiring. I conected my new diag tool and there were no fault codes but when I displayed live data for cylinder errors, 4th was counting with every single woble. As I said, this happens only at idle engine speed (up to 2500rpm)... Now I do wonder what more could be wrong, spark plugs were changed in July 2019

gamma300C

Ideas ?...new plug in cylinder 4..easy and inexpensive enough. If miss in cylinder 4 persists, would check compression in that cylinder. Maybe swap out coil #4 with another coil and see if problem follows the coil.

Rosta Stehno

Coil on 4th is new (today it was exchanged), sparkplugs are almost new (July 2019).
I made more diagnostic and test runs with live-collecting data and I discovered that it missfire only at idle speed or when there is almost no load (for example city driving with light foot). Its only cylinder no 4. But when I push the throttle, and load of engine is more than, lets say 20 - 30%,the missfire is gone, I even tryied it to rev it like hell, but there is also no missfire while doing that (to be precise ECU did not recognized them). Even at low engine speed but heavy load there is no missfire.... I am little bit confused of that ...

gamma300C

I had mentioned a new plug just to rule out the "almost" new one wasn't the problem. Partially clogged injector..?... Weird for sure.

DrivingForce

Is using Techron a bad idea on these engines?

Rosta Stehno

I thinked that it could be the problem, becouse only at low load and idle, injectors opening times must be really short (like few miliseconds), so there could be a problem with injector valve or solenoid being slightly jammed or something else so it cannot open so quickly......
Just thinking.....

xsever

I had a similar problem on my late CLK 320 with the M112 engine. It appeared after we had taken the engine out of the car to replace some coolant seals inside the engine. The misfire would only appear on one cylinder and only at idle. The problem turned out the be that the timing chain was one tooth off. Fixed that and the engine went back to buttery smooth at idle.

Rosta Stehno

I already replaced timing chain and solved that problems with timing error codes.
But the idle missfire problem could be spark plug damaged by faulty coil, tomorow I will see...

xsever

Alright. Just so you know, the problem with the engine would result in misfire but no timing error codes would display whatsoever. That's why it took us a while to figure it out. Good luck.

meazz1

That's what I thought.
comment #2, lol

Rosta Stehno

Ok guys

Reason of rough idle were quite simple. The faulty ignotion coil 2 and 4 destroyed almost new spark plugs, so I reaplaced them again and now is everything nice and smooth Quite happy to have my M272 back with knowledge that all about timing chain is allright

Thanks all for help a I wish you many happy kilometers too

VegasWhoa

can you tell me year/make/model/mileage

Thanks

Rosta Stehno

W204.054 C280 Avantgarde 2007 115k miles.....