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RPM fluctuating on idle sometimes

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Old Jul 16, 2022 | 03:27 PM
  #1  
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From: PL, Wyszkow
W213
RPM fluctuating on idle sometimes

Hello everyone,
I have a problem with my W213 - 2016 220d. I have not waranty. After last oil and filter changing I saw problem. When I was on trafic jam I feel engine unevenly work. I was on my MB machanic. Checked fuel injectors, and lot of other parameters. He changed low presure valve (??) but problem not solved. Now he reset a settings of this valve and problem seems be bigger. he told the car should learn new setting within 200km.
It is only when car is idle. It doesnt metter P / D / N on each is the same. I do not made a photo from OBD but it was something like this:
This RPM down are not repeatable on time.




When I drive I do not feel nothing disturbing. Car has normal power and acceleration.

Anybody has similar problem? Where I can looking for a solve?

Last edited by skrawit; Jul 16, 2022 at 03:34 PM.
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Old Jul 16, 2022 | 03:44 PM
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W212 MY'14 M276-3.5NA @75kMi
220Diesel air/vacuum leak

double check all the plastic air box fittings got reinstalled well after air filter replacement. Unmetered air disturbing pressure sensor likely causing that idle issue.
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Old Jul 16, 2022 | 03:57 PM
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Originally Posted by CaliBenzDriver
double check all the plastic air box fittings got reinstalled well after air filter replacement. Unmetered air disturbing pressure sensor likely causing that idle issue.

I saw mechanic checking fittings connections but I can try made it again.

Diagram with fuel pressure also look like this in my first post. So fuel presure go down for a moment. We can not find any erros on OBD.
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Old Jul 16, 2022 | 04:14 PM
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W212 MY'14 M276-3.5NA @75kMi
fuel presure go down

Originally Posted by skrawit
I saw mechanic checking fittings connections but I can try made it again.

Diagram with fuel pressure also look like this in my first post. So fuel presure go down for a moment. We can not find any erros on OBD.
your high pressure pump control may be at fault. I don't see exactly how this would happen after a service presumably low mileage car.

Keep tracking the fuel pressure topic 👍
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Old Jun 16, 2025 | 03:43 AM
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From: Copenhagen
W222 s500
Do you fix the problem im trying all i have change all4 injectors same problem i want to try fuel pump next? Please givme some answers
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Old Jun 16, 2025 | 05:45 AM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by Shaban
Do you fix the problem im trying all i have change all4 injectors same problem i want to try fuel pump next? Please givme some answers
look for answers with scanner data
Stop replacing expensive parts.
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Old Jun 16, 2025 | 10:31 AM
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Originally Posted by CaliBenzDriver
look for answers with scanner data
Stop replacing expensive parts.
i have xentry tester no have any foult and live data on idle everything is fine but still sometimes is like have air on diesel line feel like misfire 2sec and is normal,drive perfectly no go on limp mode just idle?
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Old Jun 16, 2025 | 01:59 PM
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W212 MY'14 M276-3.5NA @75kMi
Originally Posted by Shaban
I have xentry tester no have any foult and live data on idle everything is fine but still sometimes is like have air on diesel line feel like misfire 2sec and is normal, drive perfectly no go on limp mode just idle?
Your diesel drives perfectly but idles poorly regardless of all new set of injectors.

You have Xentry, use it to see fuel pressure does remain stable.

Next look at exhaust back pressure data.

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