IllustrationDOUBLE VANOS SYSTEM ON SEVERAL MODELS OF BMW FROM 1999 TO 2006, HAVE DEFECTIVE VANOS SYSTEMS. THE E39 DOUBLE VANOS (VARIABLE VALVE TIMING UNIT) HAS A MALFUNCTION PROBLEM. THIS DOUBLE VANOS CAN BE FOUND ON 6-CYL ENGINES M52TU, M54, AND M56, FOUND IN SEVERAL MODEL CARS, E39, E46, ETC, YEARS 99-03. THE MALFUNCTION SYMPTOMS ARE ALMO…
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DOUBLE VANOS SYSTEM ON SEVERAL MODELS OF BMW FROM 1999 TO 2006, HAVE DEFECTIVE VANOS SYSTEMS. THE E39 DOUBLE VANOS (VARIABLE VALVE TIMING UNIT) HAS A MALFUNCTION PROBLEM. THIS DOUBLE VANOS CAN BE FOUND ON 6-CYL ENGINES M52TU, M54, AND M56, FOUND IN SEVERAL MODEL CARS, E39, E46, ETC, YEARS 99-03. THE MALFUNCTION SYMPTOMS ARE ALMOST ALL SUBTLE AND MOSTLY GO UNNOTICED. THEY INCLUDE LOWER GAS MILEAGE, LOWER PERFORMANCE, DEGRADED EMISSIONS CONTROL, AND POSSIBLY OTHERS. THE M52TU ENGINE (99-00) HAS ONE FURTHER MALFUNCTION SYMPTOM WHICH IS FAR FROM SUBTLE. IT OCCURS ON COLD WEATHER COLD ENGINE STARTS AND TAKES THE FORM OF REPEATED ENGINE ATTEMPTED STALLS AND POSSIBLY A COMPLETE ENGINE STALL. THE ENGINE RPMS DROP DRAMATICALLY AND THEN RECOVER. THIS THEN REPEATS AFTER A FEW SECONDS OF STEADY IDLE. THE PROBLEM CAN BE MORE DEFINITIVELY DIAGNOSED BY DISCONNECTING THE VANOS INTAKE OR EXHAUST SOLENOID ELECTRICAL CONNECTOR. *TR