Prerequisites for a turbo test
Coolant temperature at least 80°C. Engine control unit fault memory interrogated. The exhaust gas recirculation system is OK.
Instruction, In the event of a fault in the exhaust gas recirculation system, it is not possible to obtain reliable values during the turbocharging test.
No leaks in the area of the intake and exhaust manifolds. The control line to the boost pressure valve is not clogged, loose and tight. No problems with the engine or injection system, such as problems with compression or unit injectors.
Consequences of leaks in the boost system
A. Leak in area after air mass meter -Q70-
Possible causes of faults: 1. Connecting hose between air mass meter -G70- and turbocharger. 2. Connecting hose to the crankcase ventilation system. Consequence: insufficient power.
B. Pressure line leak after turbocharger (intake manifold area)
Possible causes of faults: 1. Air hoses and pipes between turbocharger and intercooler, 2. Air hoses and pipes between charge air cooler and intake manifold, 3. Intercooler, 4. Seal under intake manifold pressure sender -G71-, 5. Seal between intake manifold fitting, mechanical EGR valve and intake manifold, 6. Seal between intake manifold and cylinder head. Consequence: The boost pressure is too low.
C, Leak after turbocharger (exhaust manifold area)
Possible causes of failure: 1. Parts of the exhaust gas recirculation system, 2. Exhaust manifold/cylinder head connection. Consequence: boost pressure too low, exhaust fumes, traces of soot in the engine compartment may occur.
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