M-Class (W164) Produced 2006-2011: ML280CDI, ML320CDI, ML420CDI, ML350, ML500, ML550

Loss of power possibly due to faulty Inlet Port actuator.

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Old Mar 10, 2015 | 11:14 PM
  #1  
Mercdz ML's Avatar
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From: Australia
ML320
Loss of power possibly due to faulty Inlet Port actuator.

We have a 2007 ML320 with a problem that I would appreciate some advice with.

The engine has lost a lot of power (virtually overnight) and I think it is driving in 'emergency mode'. The yellow engine management light is on. I have been told that the ML320's have a history of the Inlet Port Actuator breaking down and having to be replaced. The actuator I understand in internal and requires the inlet manifold to be removed.

Has anyone else any similar history with their car and are their any other known possible causes.


Thank you,


Peter.
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Old Mar 10, 2015 | 11:33 PM
  #2  
Hamlin's Avatar
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C230K ML320 CDI
I just went through this issue with my ML320.
In my case, the fault code was 2078-008; Component B28/8 -Pressure differential sensor- which monitors the diesel particulate filter.

My fault was a bit different as it would sometimes run fine, but then the next time I started it it would be in limp mode.

Not sure we have the same problem, but getting the code read is the easiest first step.

Good luck!
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Old Mar 11, 2015 | 10:25 AM
  #3  
06e320cdi's Avatar
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From: Cross Roads, PA
2008 ML320CDI
Issues to check are the Pressure Differential sensor as noted above, the EGR valve. With out having the codes its nearly impossible to determine what is putting the vehicle in LIMP mode.
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Old Mar 16, 2015 | 08:19 AM
  #4  
zemun1234's Avatar
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Joined: Nov 2007
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From: Toronto, Canada
2005 E320 CDI (sold); 2007 R320 CDI (sold); 2008 ML320 CDI; 2014 ML350 Bluetec
Originally Posted by Mercdz ML
We have a 2007 ML320 with a problem that I would appreciate some advice with.

The engine has lost a lot of power (virtually overnight) and I think it is driving in 'emergency mode'. The yellow engine management light is on. I have been told that the ML320's have a history of the Inlet Port Actuator breaking down and having to be replaced. The actuator I understand in internal and requires the inlet manifold to be removed.

Has anyone else any similar history with their car and are their any other known possible causes.


Thank you,


Peter.
I got similar problem and resolved with 0.5$ resistor (try 1/2 W or bigger) which it is simulating inlet motor to operate OK. In general, disconnect motor (it is around fuel filter, put resistor (4.7 KOhm) in middle connector (2 of 4) and drive I think it is running faster since I did it

Search Jeep forum for more information or just add your subject word 'resistor'
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Old Apr 25, 2015 | 10:16 PM
  #5  
Mercdz ML's Avatar
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From: Australia
ML320
Thanks to all for your replies.


I put the car into 'dry-dock' and the problem was a seized inlet port actuator and broken connecting arm.
The complete inlet manifold assy was replaced.


Problem fixed.


Thanks to all for your replies.


Pete.
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