mdotk

My recently purchased 2014 63 started randomly vibrating when both starting up and also idling at lights. Like it was an engine miss or something. But RPM doesn't dip and no sounds. Can't feel any vibrations at high speed (but if I am at lights and take RPM to say 2K and it does "the issue" the RPM needle will dip). Does it in neutral, parked, gear. Sports, C, eco, etc. The car performs well at all other times except idling/startup. It doesn't do it every time I idle at lights (maybe 25-40% at idle), but does it 99% of the time when starting up.

Took the car back to the dealer and after 2 days of diagnosis they said the engine and transmission mounts needed replacing. This was done and I was relieved as that seemed to be the #1 cause from the forums.

Got the car back and all seemed fixed! That lasted about 2 weeks and now the issue is back! The EXACT SAME THING IS HAPPENING.

Have tried different fuel - no difference.

Reading other threads people are suggesting:

• vacuum leak from intake manifold gasket
• engine harness (oil migration)
• defective intake adjuster
• fuel pump
• ignition coils

Any ideas on where to go from here? Could they have used defective mounts? Some how not installed them correctly? Just so weird how it was seemingly solved after they had it (and did the mounts), and now it's back a few week later!

No codes, no CEL, ever. Oil level is good. 50K miles.

PeterUbers

You need to take it back and have them look at the mounts again ....

TTTAAAMMM

I'm having the same exact issues on my 2010 E63, I've replace my transmission mount already, will be replacing my motor mounts in the future and
hope that it fixes that issues. Also have to replace my intake manifold gaskets, full brakes all around and front struts soon.

raudiace4

Had the same issue on my 2014 E63 couple years ago. Had motor mounts replaced, and trans mount. It was the front 4matic driveshaft.

https://mbworld.org/forums/w212-amg/...t-install.html

V-AMG

Have you had any exhaust work done lately?

I ask because if you removed resonators and replaced them with straight pipes, it can cause a shaking at idle. The two banks fire in such a way that the exhaust moves side to side, causing the car to feel like it's shaking. There needs to be some sort of a crossover between the banks.

TTTAAAMMM

Thank you for the link and information! I have the exact same symptoms, put in neutral and the vibration would go away.

TTTAAAMMM

Attachment; diagram I got from dealer, I just ordered front, rear flex couplings and center support bearing. I'll let you know if it fixes the vibration problem.

- Tam

cocobeex

I'm having same vibration.
Hopefully, it gets fixed after replace all the parts.

mdotk

They found the problem was a faulty injector on the 6th cylinder. Part ordered and will report back when hopefully all fixed.

cocobeex

Hopefully, both parts are the cause of the issues.

As i remember injector replacement needs Xentry system to verify after injector is replaced.

mdotk

Thanks, you mean in order to keep a factory warranty? I have a 3rd party warranty. Would independents have access to Xentry? They got the part direct from MB here.

5soko

This is correct, the injector has a # on it which you need to take a picture of or write down, that needs to be entered into the ecu via xentry. It is a compensation # and most modern direct injection motors have this nowadays.

Replace all seals and such aswell and once you remove the protective cap off the inejctor, it needs to be installed quickly as the seals swell up.

Most shops have Xentry, or some sort of program that might do this job. Like i said, this isnt the first motor that needs this injector to be programmed so most shops are familiar.

Blk Betty

Subbed, same issue. Tuned, downpipes, no x pipe / crossover brace. No codes being thrown, so assuming it's injectors after the tune. 🤔

iceman2002benz

interesting post......I had the similar issue over the weekend. I drove the car about 10 miles then check engine light came on. the car drove very bad. it was idling from 600 rpm at a stop then drops to 400 rpm. Back and forth from 600 to 400 rpms.
I pulled over to the road and turn off motor. re-start it, check engine light went away and no more idling back and forth. seems like it issue went away?
I purchased the extended warranty from Mercedes so I will be taking it there to get a diagnoisic test. I just purchased it a month ago, it is a 2014 E63 AMG S with 48K miles.

Rbalancia

Was the faulty injectector detected through a code?

mdotk

No I don't think they found a code (and I never got a CEL). I think they hooked the car up to a laptop and saw the faulty injector on some graph software? Sorry not techie like that...

Anyway, my vibration problem is now gone.

It's interesting that I still do get the very occasional and slight/quick vibration when idle. It is minuscule but noticeable nonetheless (maybe because I am watching for it!). I am not worried about it. it's a big engine and I have new engine and tranny mounts so can't be those.

Start ups and revving then idling are now smooth as (these were the 2 times when my old miss/vibration would be most noticeable).

iceman2002benz

In my case, car drives and idles fine at lower rpm, when rpm reach over 4000 rpm, CEL comes on and idles rough. Tech told me injector 6 and 8 are misfiring. I purchased the car least than two months, with 3 year extended warranty. They also told me the car has a O2 link somewhere. After tech reprogrammed the 6 and 8 injectors, car idles fine, no more rough idling and misfiring at any rpm, but still looking for the O2 link. Car feels weaker???

iceman2002benz

just picked up my E63 and the dealership reprogrammed the number 6 and 8 injectors due to misfiring issue. no more misfiring issue now......the dealership also replaced the air filters with factory ones and no more O2 leak code.
not sure what the codes were since they did not tell me, but the car drives fine now and no more CEL or rough idling at any RPM.

PeterUbers

so you mean there was a misfire in the cylinder due to injector problems ... not plug or coil problems, correct?

iceman2002benz

In my case, yes. Tech told me he reprogrammed injector 6 and 8. Once he did that, idle very smooth and no more code. I already drove over 100 miles with no issue now