Since the repair of VANOS (described here), almost 100,000 km have passed. It’s time to check how VANOS is doing!

Here, the cold start, first several tens of seconds (the engine temperature around 15 oC): 

Upper curves: inlet VANOS, lower curves – exhaust VANOS,

As we see, the difference between the required and the actual VANOS value is less than one degree.

Cold start (the warm-up phase of CO catalytic converters is completed). 1500 .. 2000 RPM:

Here, even during the transition process, the difference between the required and actual position is not more than 1 .. 2 degrees, but in a stationary mode – it matches perfectly.

Partially warmed up the engine (temperature of the cooling liquid around 70 oC, oil temperature around 60 oC); 2000 RPM:

This particular temperature mode was the most unstable before the repair. Now everything is perfect! Let’s check the PWM of the VANOS solenoids:

In light green and light blue (both bold): PWM values of the valves. Valve management – perfectly stable!

In yellow (Axys 3): temperature of the cooling liquid. 

And here – a warmed-up engine; 2000 RPM. In bold – exhaust VANOS curves (exactly this current VANOS experiences most problems before repair):

As we see – no problems anymore!

Data clearly shows – that after the repair, during 100,000 km, the performance of VANOS is still perfect. What is the secret of such “luck”? Oil changes 2x often as the manufacturer/CBS indicates, even if the driving profile is good (average speed of the car – 60 .. 65 km/h).