snowmuch

I was just driving on the high way got the check engine light with loss of power, engine rattles like crazy. So I pulled over and waiting for towing


Update 1 while idle there is a strong smell of gasoline

snowmuch

After doing some research I think it could be the CAM sensor. Can I buy the sensor and replace it myself? Or I need the dealer to "resync" the CAM?

Merc63

Post the code.

snowmuch

I dont have the proper tools
at home I will post it on Monday.

Ingenieur

All on the same bank
I'd start with maf or O2 sensors
Unplug the maf and see how it runs

Have you messed with the airboxes or filters recently?

abcut973

^ That will help you troubleshoot the misfiring codes (spark plugs, O2 sensor, fuel injector/fuel regulator...)
Probably one of the reason you have that gasoline smell.
As for the powertrain codes I have no ideas

Ingenieur

A bad O2 or maf may over fuel / run rich hence the gas smell
Misfires also will result in unburnt fuel

You can swap the maf's and if the codes follow then you know
If they don't probably good
The fact that you are not getting plausabilty errors for either sensor makes me think loose airbox?
Unmetered air would cause the ecu to over fuel because the O2 would read lean

snowmuch

I did the row mod and kn filters back in the summer, no issues so far.

Ingenieur

Make sure everything is seated properly and screws are tight
I would clean the maf with the crc cleaner (most parts stores)

Does anyone know how the cylinders sre numbered?
From front the left side is 1-4 by convention but not sure?

PeterUbers

I've read that the kn filter oil can adhere to the maf sensors in other vehicles

snowmuch

I just purchased a bottle of MAF cleaner on my way home. I will reseal the airbox and clean the MAF to see if it does anything.

btw the place I live has a lot of snow but the weather is good recently so everything melt into mud, does this have something to do with it?

Ingenieur

Probably not

david_rasuli

Same thing happened to me, pulled over and turned the car off and turned it back on 5 mins later, all good now.

snowmuch

So I opened the airbox found a bunch of mud in there cleaned them out clean the MAF with MAF cleaner CEL is still on... Any advice?



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snowmuch

When I unplug both MAF sensors the other codes disappear.

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papashango

Sorry you're having all the issues man can't really offer any help but hope you get them sorted quick and cheaply. This is the exact reason why I am so worried about messing with the engine. I wouldn't have a first clue about fixing stuff like this.

snowmuch

Thanks! I hope its a quick fix as well. But have you seen the pictures I've posted? All those mud got into the airbox due to this crazy weather!

papashango

Yea I saw, perhaps the airbox wasn't locked properly or something? I would be really shocked to see if that happened to a stock car that hasn't been played around with.

ZephyrAMG

all that mud in your airbox and intake is the craziest **** I have ever seen in my history of messing with cars.....wth?! did you drive through the amazon? That is detrimental....

AMG893

Wow man, that is ALOT of debris in there.

I recently changed my filters to K&N, and when i was taking OEMs out, there was debris in mine, i thought it was bad, but looking at your pics, mine was clean in comparison!

I think this is what may be causing your problem.

Merc63

Don't know why people are saying to run the car without the MAFs, that will do nothing.

Throw those filters out and go get some new stock ones. Clean the boxes, clean the mafs.


Your 02 sensors are probably screwed. Do you have exhaust mods? Parts source should have primary O2 sensors call them, that's where I got mine.

These cars run continuous closed loop feedback from the o2s, if they are screwed up car won't run worth a damn.

Pull your spark plugs as well, they are probably fouled now and will need a cleaning or new ones.

ToXicXxX

If you want I still have my old NA airboxes with MAF's, you can drop by and try one.

What millage is your car at... Might be sparkplug or coil time.

Mercedes intakes are famous for collecting crap... Because there are no 90 degree turns in the system to trap debris (but, 90's also hinder flow as the air must change vectors), everything goes directly in and culminates at the filter.

Ingenieur

pulling the maf will default and should limit misfire if running at the ends of its signal range

his other faults clear when they are removed
the faults are only 1 bank

I'm guessing a short due to moisture based on the codes when the maf is plugged in
unrelated? speed control, manifold flaps, power steering, fuel level, intake heater???

I would put the car in a dry heated space and start cleaning connectors
that's just me

snowmuch

Update 2.

Spark plugs were changed today and coil are swapped but cylinder 7 and 8 still misfire and car sounds like its choked on something and its about to die. When the MAFs are unplugged the car sounds way better but still rattles a lot. Will try new MAFs tomorrow. The shop think its possible cam solenoid sensors.

Ingenieur

You replaced all coils including 7 and 8?
And they still misfire?
Probably not coils
Did the other codes go away? Steering, intake heater etc ?
Smoothed out with maf disconnect but still lumpy
New filters? Cleaned?
Try it w/o the filters, not drive, just idle