E-Class (W212) 2010 - 2016: E 350, E 550
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RPM drops below 500 when either put in D or R

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Old Oct 23, 2021 | 09:35 PM
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Exclamation RPM drops below 500 when either put in D or R

hi all,
My 2011 E350 is acting up again..
It starts at 700 RPM at idle but as soon as i put it in D or R, the RPM drops below 500 and the car starts shaking..
I clean both EGR valves but didn't help..



Could it be transmission mount or Engine mount?
Thanks.
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Old Oct 23, 2021 | 10:55 PM
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W212 MY'14 M276-3.5NA @75kMi
MAF (no MAP)

Originally Posted by 2011WhiteE350
hi all,
My 2011 E350 is acting up again..
It starts at 700 RPM at idle but as soon as i put it in D or R, the RPM drops below 500 and the car starts shaking..
I clean both EGR valves but didn't help..



Could it be transmission mount or Engine mount?
Thanks.
Have you cleaned your MAF intake sensor 'cause they get coated by sticky dirt and start screwing up the mixture.

Take a look at live FUEL TRIMS data to see if bank are in tune or off balance, how far rich/lean.

What maintenance has be done to this engine for the past 25KMi??

May be you got some catching up do besides oil changes:
  • Spark Plugs, coils,
  • PCV, Valve cover rear plugs,
  • Tranny mount, ATF
  • Fuel pump filter
  • Voltage regulator
  • Upstream O2/lambda Sensors
  • (Coolant, AirFilter)
Anything else missing, engine wise??
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Old Oct 23, 2021 | 11:08 PM
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1983 Nissan Shltbox
Pull codes.
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Old Oct 24, 2021 | 10:49 AM
  #4  
2011WhiteE350's Avatar
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Originally Posted by CaliBenzDriver
Have you cleaned your MAF intake sensor 'cause they get coated by sticky dirt and start screwing up the mixture.

Take a look at live FUEL TRIMS data to see if bank are in tune or off balance, how far rich/lean.

What maintenance has be done to this engine for the past 25KMi??

May be you got some catching up do besides oil changes:
  • Spark Plugs, coils,
  • PCV, Valve cover rear plugs,
  • Tranny mount, ATF
  • Fuel pump filter
  • Voltage regulator
  • Upstream O2/lambda Sensors
  • (Coolant, AirFilter)
Anything else missing, engine wise??
This is what i did in the past 25k miles..
  • Spark Plugs, coils..DONE
  • PCV, Valve cover rear plugs, I need to look into these.
  • Tranny mount, ATF. DRAIN AND FILL WITH NEW FILTER.
  • Fuel pump filter. NOT YET
  • Voltage regulator. NOT YET
  • Upstream O2/lambda Sensors. NOT YET
  • (Coolant, AirFilter). Air filter is practically new.
If the PCV, fuel pump or voltage regulator, codes should pop up right??
Nothing else is missing. I remove the engine cover to show the EGRs..
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Old Oct 24, 2021 | 10:50 AM
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E350
Originally Posted by Senecat
Pull codes.
No codes pop up but i see this $83 Test passed, $84 Test Fail and $86 Test Pass..
I try to look them up on google but no luck.
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Old Oct 30, 2021 | 05:56 PM
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Probably just need motor mounts. All of these W212 and W204 cars end up needing mounts after 100K and it's no picnic. Sometimes you can reduce the vibration with a transmission mount if it's really bad when putting into reverse. She will still need front mounts
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