tahir

yeah unfortunately i do have check engine light on. i always thought it goes on for anything related to fuel so here goes .

nick 55

Mine is going in on Tuesday after the dealer confirmed my diagnosis with a compression test. The right cylinder head is being replaced. There is a technical bulletin on the issue, but I don't remember which one it is.

Nick

Nbruton1

I have a 2008 GL 550. According to computer diagnostic, cylinder 3 misfires.

Very frustrating at stoplights. Seem to still have full power during acceleration though.

Could it be ignition coil?

crniamg

yes that is the bad coil or spark plug just to make sure take the coil and move it to different spot

Nbruton1

Move it to a different spot?

crniamg

#3 to #2 and check the code for #2 to make sure it's bad coil

zam2000

Pick up my car this morning from dealer this morning. Car runs normal, except for slight hesitation on low RPM. CEL, so mechanic checked code and found misfire code.

Further check showed low compression reading in one of the cylinder (4th one, I think), due to worn out valve guide due to not properly aligned. From the paperwork, look like they changed a bunch of thing & lot of labor.

THe mechanic/advisor didn't seem to be so surprised by what he found, and from his talk, look like he had seen a number of similar problems.
Lucky that car is under warranty (extended warranty from MB), so it cost me nothing. Else it would hurt.

Funny how I was commenting to my wife that we bought the ext warranty for almost a year, and have not used it at all. Two days later, the CEL turned on and car went to dealer for a week.

Dreamszalone

I too faced this problem, rough start and shivery idle with CEL only once, this happened to me after I kept the car in garage without starting it for 4 days (in Last week Cold) took it to the dealer for some other repair and just casually mentioned about this issue, because I never got the same issue after restarting the car until now, after they did some short test and confirmed 2 coils (7 & 8) has gone bad, I was like hummmm didn't gave any issue until except once. but I still authorized them to go-ahead and fix it. Anyways car is still with the dealership will see how it goes.

rob37w

I am also having this issue. Slight vibration when in drive and at a complete stop. Goes away once i give it a little gas or put it in neutral.

How do you check the coils without taking the car to the dealer? I changed my plugs 35k miles ago. Should i try new plugs?

2008 C300 4matic sport
90k miles

rob37w

I am also having this issue. Slight vibration when in drive and at a complete stop. Goes away once i give it a little gas or put it in neutral.

How do you check the coils without taking the car to the dealer? I changed my plugs 35k miles ago. Should i try new plugs?

2008 C300 4matic sport
90k miles

Dreamszalone

May be you got non-OEM plugs or the plug's are not fit with right torque.

The cheapest way to know the coils bad is take it to any Autozone or AdvanceAutoparts and ask them read the codes from your car they will do it for free, but that doesn't mean you don't have to TIP them please do so....

And also you can download\purchase a app from Googleplay store its called (TORQUE) for $6.00 and buy a bluetooth OBII adapter ($20 I guess) the app will have the list of adapters it work with it and thats it you are good to plug it and and it will read the codes out on your Android....

Hope it helps.

rob37w

I have a code reader but my check engine light isn't on. Ill hook my code reader in tonight and see if i get any codes.

I changed my plugs 35,000 miles ago and have not had a problem until now. So i don't think it is that i purchased wrong plugs. I bought OEM plugs.

Ive checked everywhere for vacuum leaks and can't find any.
Changed air filters
Cleaned throttle body

That's why i'm now moving to plugs and wires.

Dreamszalone

AS you mentioned you did Throttle body cleaning, check if your Vacuum lines are in right place and not crossed.

And also check for the timing....

And then check for the Coils.

rob37w

Vacuum lines all checked out.

The timing seems fine as this is just an issue at idle in drive. If the timing was messed up i feel that it would be rough all the time.

Coils and plugs are my next move.

If i have a bad coil will i see a code even thought my check engine light isn't on?

THANKS FOR THE HELP

Alexcanoa

Well on my 2011 i experience same issue replace manifold new sparkplugs fliters ,mercedes benz fuel aditive but the jerking engine does not goes away any one know the solution?

Anthony Ochs

This is getting out of hand. I spent $12K in repairs in the first 2 months on my used Mercedes when I bought it almost 8 months ago. I bought it so I wouldn’t have any vehicle payments. There’s no way they aren’t in the business of engineering their parts just right to last so so long so you go spend money with them. It’s their greed. This is why they’re killing everyone off with this vaccine. Because they’ve gotten too greedy and now we’re starting to make out that they are responsible for the child sex trafficking. I’ve babied mine and take very good care of it and now I have this whining sound. I’m done letting these corporate piece of s***s not take accountability for their problems. Saying “it’s normal”.

This ends now. What can we do? And don’t say nothing you can do, because there is something we can do. I’ve had enough of this. I thought I was buying a nice reliable vehicle only to learn that this would be the BIGGEST piece of junk I ever spent money on in my life.

olcree1111

Get a lawyer. Maybe lookup who successfully did a class action lawsuit in the past. For example: Mercedes-Benz Engine Defect Class Action Lawsuit:Majeed Seifi, et al. v. Mercedes Benz USA LLC, Case No. 3:12-cv-05493. The plaintiffs were represented by Roy A. Katriel of the Katriel Law Firm and Gary S. Graifman of Kantrowitz Goldhamer & Graifman PC.