Fuel stratified injection (FSI) engines are found in VW and Audi cars that use fuel injection technology. From time to time, we diagnose a FSI car with cam follower failure. We thought now would be a good time to discuss this vital component, how it fails, and the symptoms to watch for.
What the Cam Follower Does
The cam follower acts as a barrier between the camshaft lobe and the high-pressure fuel pump. Like any component, the cam follower will eventually wear. Causes of failure can range from using low-quality motor oil to making improper modifications to the fuel pump.
If the cam follower wears all the way, damage to the cam shaft and fuel pump will probably follow. Some mechanics say that the cam follower is more prone to failure if it has undergone certain modifications. These include the installation of an aftermarket high-pressure fuel pump or larger turbos. However, we have observed cam follower failure in cars with both stock and aftermarket parts. Continue Reading →