Hi forum,
I'm a friend of member JohnForde who is stranded at my house in his 2004 Sprinter. It is running poorly with lots of black smoke on acceleration and low power. We've done some preliminary trouble-shooting thanks to the great help here and right now our main suspect is the turbo vane control. The linkage is not frozen as it moves when started and when the MAF wires are removed (down at idle, up to 'engine off' position when MAF disabled) but the funny thing is that it does NOT move significantly at all when the engine is rev'd. In other words, when started at idle the actuator arm moves down about 2 inches (viewed from the top) but then when the engine is rev'ed up it doesn't move at all until the engine is off or the MAF wires are disconnected.
Some other information is that the air filter was extremely dirty and has been replaced (no change). To my un-trained ear it sounds like the turbo has a dry bearing when the engine is rev'ed up (it's quiet at idle) but when spinning the shaft by hand it feels smooth and spins easily. It also has the aluminum turbo resonator.
We pulled some codes using a generic OBDII and got the following (the MAF codes could be due to the fact that we drove to the store with the sensor disconnected)
P0402 - excessive EGR flow
P2506 - ECM/PCM power input
P0102 - MAF low input
P0100 - MAF circuit
P0131 - 02 low voltage (bank 1 sensor 1)
P0406 - EGR sensor A circuit high
P0299 - turbo underboost
It sure seems like an air supply problem due to the black smoke and low power. At idle or easy cruising speed it seems to be running fine. It is only during acceleration or high rev's the problems become noticeable.
Any help in diagnosing this would be greatly appreciated!
I'm a friend of member JohnForde who is stranded at my house in his 2004 Sprinter. It is running poorly with lots of black smoke on acceleration and low power. We've done some preliminary trouble-shooting thanks to the great help here and right now our main suspect is the turbo vane control. The linkage is not frozen as it moves when started and when the MAF wires are removed (down at idle, up to 'engine off' position when MAF disabled) but the funny thing is that it does NOT move significantly at all when the engine is rev'd. In other words, when started at idle the actuator arm moves down about 2 inches (viewed from the top) but then when the engine is rev'ed up it doesn't move at all until the engine is off or the MAF wires are disconnected.
Some other information is that the air filter was extremely dirty and has been replaced (no change). To my un-trained ear it sounds like the turbo has a dry bearing when the engine is rev'ed up (it's quiet at idle) but when spinning the shaft by hand it feels smooth and spins easily. It also has the aluminum turbo resonator.
We pulled some codes using a generic OBDII and got the following (the MAF codes could be due to the fact that we drove to the store with the sensor disconnected)
P0402 - excessive EGR flow
P2506 - ECM/PCM power input
P0102 - MAF low input
P0100 - MAF circuit
P0131 - 02 low voltage (bank 1 sensor 1)
P0406 - EGR sensor A circuit high
P0299 - turbo underboost
It sure seems like an air supply problem due to the black smoke and low power. At idle or easy cruising speed it seems to be running fine. It is only during acceleration or high rev's the problems become noticeable.
Any help in diagnosing this would be greatly appreciated!