Hi Adam,
Sorry, didn't see your pervious post (#18 on 11-6).
To answer the questions asked in that post:
Question that might be obvious but I am new and trying to learn. Had the van into a mechanic who to read codes and diagnose the issue for me.
If the shop had a fully capable Sprinter diagnostic system....this is the best way to determine if you have a turbocharger actuator issue.
He said that the turbo waste gate actuator is not functioning.
He was simply using the wrong term.
A "waste gate" on a turbocharged engine is simply a pressure limiting valve. If the turbocharger develops too much pressure the wastegate
opens and dumps all the pressure that is above the limit/threshold that the valve opens.
There are many turbocharger systems that operate in this manner, but not MB Sprinters.
Is this the same as the turbo actuator?
Not the same, but the same basic function (controlling the turbocharger boost pressure).
Your turbocharger actuator controls the boost level that your engine receives.
The turbocharger actuator is controlled by the main Engine Control Module (ECM), regulating your boost pressure
to match the current load level the sensors say the engine is developing.
When you accelerate, the sensors tell the Engine control module (ECM) to push more fuel to the engine, and to balance
the higher fueling rate, the ECM signals your turbocharger actuator to divert more exhaust flow onto the turbocharger
drive/bucket wheel (the hot side of your turbocharger) so the turbocharger spins up faster, developing more/higher boost
pressure in the driven/cold side of your turbocharger.
There is no "waste gate" on your OM-647, but the turbocharger actuator regulates the turbo boost pressure so that it
does not exceed ~ 37 PSIA (Absolute pressure....above the ambient 14.7 PSIA at sea level). This equates to ~22 PSIG (Gauge pressure,
not taking into consideration ambient atmospheric pressure or altitude).
Or is a waste gate a different part?
Your Sprinter does not have a wastegate.....it does not need one as the turbocharger actuator controls the turbo boost
pressure without a need for a "pop off" valve if the turbo develops more pressure than your engine needs.
If your turbo pressure goes too high, the boost sensor (MAP-Manifold Absolute Pressure sensor) will sense this and
signal the turbocharger actuator to reduce the boost level. If the boost level is not reduced to the proper level, the
ECM will signal a "over boost" condition, and tell the turbocharger actuator to shut your turbocharger OFF.
Sorry if this is a stupid question.
No such thing a stupid question....you didn't know the difference between a turbo actuator and a waste gate.
Now you have a better idea of what they do, how they function to regulate your turbo boost.
On your next question, yes, it sounds like you need a new or rebuilt turbo charger actuator.
Sorry, at the DIY level, the actuator either works....or it doesn't.
Here's a business that sells OM-647 Turbocharger actuators"
http://www.xsboostturbochargers.com...n-turbocharger-electronic-actuator-2004-2007/
Hope this helps,
Roger