New turbo actuator new fault

[jshodgson]

i fitted a reconditioned turbo actuator as mine was causing a juddering when under load. That fault has no disappeared but I have a new fault which throws the car into limp and I get 3 error codes. One is O2 sensor and one is ERG the over is N/A.
Any ideas?

 

[clk320x]

Edit

 

[pnevesfoto]

If you car has DPF look for the exhaust back pressure sensor, it usually throws the limp modes under load with false codes... But first be sure that all your hoses from turbo to intake are free from cracks or splits... They usualy are the first cause of those sympthoms

 

[wu56Shoozz]

Take the EGR off for a clean, and replace. Replace the o2 sensor too as this will give the stutter you refer too.. once replaced report back.

 

[jshodgson]

i fitted a reconditioned turbo actuator as mine was causing a juddering when under load. That fault has no disappeared but I have a new fault which throws the car into limp and I get 3 error codes. One is O2 sensor and one is ERG the over is N/A.
Any ideas?

EDIT - I fitted a reconditioned turbo actuator as mine was causing a juddering when under load. That fault has now disappeared but I have a new fault which throws the car into limp mode and I get 3 error codes. One is O2 sensor and one is ERG the other is N/A. The car ran brilliantly before I replaced the actuator (apart from the judder). I have spoken to the turbo shop and they have said that they new actuator could be causing the car to experience parts of the engine/turbo that the old actuator prevented it from using due to it being worn. They have suggested cleaning the turbo.

 

[OneForTheRoad]

Before you go any further have a scan check the live data from the exhaust back pressure sensor . it should read around 950 to 1050 mbar . this part is a very common failure on these cars. Failing that buy a new sensor and replace it at around £45 .

 

[wu56Shoozz]

^ Wot he said..Pssstt!! How's the "Bacofoil"

 

[OneForTheRoad]

^ Wot he said..Pssstt!! How's the "Bacofoil"

]

In addition to the oil cooler seals; this engine can also have an issue with the design of the positive crankcase ventilation system. The crankcase ventilation system vents to the inlet of the turbo. The issue is that the air vented from the crankcase contains too much oil to easily pass through the swirl motor valves downstream of the turbo. Once this oil and sludge begin to accumulate, the valve becomes inoperative and blows a fuse that controls many other sensors required to properly operate the engine and emission system. This will immediately place the vehicle into limp home mode and limit the rpm to 3000. It also causes a check engine light and numerous OBDII Codes. Mercedes Benz has previously recognized this feature of the vehicle and has stated that this engine feature, the accumulation of oil at the turbo inlet, is "normal". In a Technical Service Bulletin they issued in 2008 they state: "Engine oil venting occurs on the right hand side of the engine air intake duct. For this reason there is always some oil in the engine air intake duct, see (Figure 3). This is no justification for replacing the turbocharger. Turbochargers replaced for this reason will not be covered by warranty."[9] While a slight amount of oil may be normal and acceptable, sufficient quantities and accumulation will indeed lead to other failures as identified above

 

[wu56Shoozz]

^ Well Found Sir! Good one!

 

[jshodgson]

I ended up sending the actuator back and got a replacement and now the card runs perfectly.