2011 mercedes e350 4matic

Im curious if anyone else has had the intermittent problem with their w212 bucking between 1st and 2nd gear when hard accelerating. When i bought the car two years ago the dealer said the transmission was brand new a year prjor to me buying. The bucking only happens between 1st and 2nd gear, doesnt do it every time, maybe only with the 1st start of the car for the day, sometimes it doesnt do it at all.

 

that is a tough call

Most tranny issues can be traced back to the engine itself.

Tranny can only perform as well as engine. Simply give tranny fresh genuine ATF.

To me bucking sounds like low fuel pressure. Read the rail pressure with your MB scanner.
Your 2011 may be due for new tank filter.

 

whats the part# for said “tank filler” so I make sure I know exactly what you’re referring to. I’m having a similar issue.

 

I always hate the "parts canon"....

Use a scanner to read your tank fuel pressure to see where you stand.

Obviously these cars love all genuine new parts owners throw at them.

 

 

 

The live data on the 4x screens above look 100% ok !

Fuel is at exactly 70Psi static pressure... perfect!

Now see what happens to fuel pressure with engine operating under load.
Q: Does pressure nearly hold 70Psi or collapse ?
The answer will be pass/fail for fuel filter flow.

If "passed"... your engine is "bucking" for other reasons - Read any ECU fault codes?

 

I totally forgot to mention that in between my last post, I found that the MAP sensor vacuum line was pinched, and I also repositioned the throttlebody and MAF sensor, so there was a better seal. then I was able to secure the clip that holds the air box and MAF sensor housing together and now she drives like a dream.

I apologize for the confusion

 

Nice happy ending!
MAF is sensing well again.

No fuel filter work needed:

 

I do need to replace one of my fuel injectors, but if I’m gonna pull the rail I might as well do all six and call it a day. What brand injector do you suggest?

VNE seems to be the OE supplier, but I’ve also seen Bosch and GB Remanufacturing as good options. I’m cost conscious, so whichever gets the job done is what I’m looking forZ

 

if your cost conscious don't replace injectors! Get them cleaned + recertified.

Bosch would be the go to brand for this internal part. When they leak cylinders get washed down and crankcase oil get diluted.... all bad news.

Replace them if your engine has extreme heat: "fan on all the time" including new connectors.

 

speaking of fan running all the time… I actually replaced the engine fan yesterday and the run on issue/battery drain when parked seems to be resolved! It’s been a good week for the old gal!

 

she likes to have your attention
Fan has quit draining AGM while parked.


> About injectors troubleshooting...
use your scanner to read individual injectors timings under ECU live data streams. You'll be able to spot abnormal numbers there.

 

Cylinder 4 is way off

 

Hi @johnfranciscog , @CaliBenzDriver

I have a 2015 E400 4MATIC Sedan (Turbo), and I only experience a bit of a "buck" on the very first gear shift between 1st and 2nd gear right after a cold start. I have been experiencing a "low fuel pressure" code for a while now though, so definitely food for thought.

My odometer just passed 130,000 , and I have only replaced my 7G-tronic fluid once at 70,000 miles so far. I wonder if I should change the fluid again before hitting 140,000?

 

i know Mercedes stretched the ATF interval from 40k to 70k after 2013 I believe. I may be wrong, but I would make sure to also drain the torque converter as this usually isn’t drained as it should be when they service the transmission.

 

ATF sce every 40 to 50k Mi or less if you indulge with high-output shifts.

Low fuel pressure at 130k.Mi qualifies for the tank fuel filter & HPFP's.Read your actual fuel pressures.

Revisit "bucking" once much needed service is done.
Low fuel pressure translate as lean mixtures that are more hot. Extra engine heat cooks coils + injectors + seals.... get to it before it gets to you.

 

@CaliBenzDriver @johnfranciscog

Sounds like a plan!

Are either of you guys experiencing the classic M276 ticking noise coming from the engine at idle and upon acceleration? I understand that it's probably due to the purge valve but as a university graduate student I'd rather not replace something I don't have to. That being said, I have loved [German] cars all my life, and I am not hesitant to address a mechanical issue that needs attention. I am trying to get as much life out of the car as I can, that's my top priority.
About how many hours each in labor does it take to replace the HPFP and the fuel tank filter?

- Andrew

 

Before you replace good parts, I'd diagnose which one needs attention.

In 2026 service charge are vaguely based on time alone... ASK FOR WRITTEN ESTIMATE and repair terms in case nothing is improved by repairs.

The cricket ticking noise I am thinking about comes from the high pressure fuel injectors. It is somewhat normal.
Can you record the ticking that has your attention??

 

Some days car goes all day without the bucking, sometimes it does it for a while then stops after turning it off and restarting.

 

This unstable chaos reads like low voltage or fuel issues.

Beware this on/off cure reads like limp-mode territory...

OBD data will help pinpoint the issue.

 

its been doin thia for two years tho lol

 

Nicely predictable for two years... then likely voltage related - Fuel issues would have further matured by now.

New batteries don't help low voltage beyond first month - This may well be the oxidized prefuse drop.

 

like today it didnt do it at all

 

oxidized prefuse drop. Explain