![]() ![]() This increases the vacuum and scavenging effect generated by the piston traveling downward. At lower engine speeds, the VANOS system opens the valves later during the intake stroke. Later dual-VANOS systems operate at all engine speeds. The early VANOS systems are very basic and work to make more power. This system also changes how the engine is throttled, which we’ll discuss later in this article. ![]() Later systems, known as Valvetronic, take VANOS to the next level by adjusting the lift of the valves. Some newer systems can change the camshaft timing by as much as ☗2 degrees. These systems adjust both the intake and exhaust camshafts. The first dual or bi-VANOS system was then introduced on the 1996 M3. These early VANOS systems could change the camshaft timing by 12.5 degrees for better performance. VANOS systems have evolved over the past 25 years, from the first single-VANOS systems that were on the intake camshaft of the 1993-1998 engines found in 325i and 525i models. You will also need a scan tool and a scope to observe the crankshaft and camshaft signals to accomplish more advanced diagnostics. As for tools, you will need the appropriate tool set to lock the crank and camshaft. What it does demand, however, is knowledge of how the actuator adjusts the camshaft, how the solenoid controls the actuator and when the engine control module changes camshaft timing. The key word to remember for a late-model VANOS system is that it works “continuously” and not just under specific rpm ranges.ĭiagnosing a VANOS system does not require that you speak German. ![]() The latest versions continuously adjust the position of the intake and exhaust camshafts for better power, efficiency and idle performance. ![]()
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