Autonerdz forums

I got the car to act up. When probing the low and high-pressure fuel sensors, I found that during the surging, I was losing fuel pressure first on the low side followed by the high side. There was no data PID so I used the scope directly on the sensors.

This pointed me to the fuel pump. I went to the pump and heard it running with a whine, sounding like it's speeding up and slowing down. I probed it and found out that the fuel pump control module was giving erratic power pulsations to it, sometimes dropping out entirely. Power feed to the module was fine, as well as the ground. The module is going bad, but, the pump sounds bad as well, it's noisy, so I don't know whether the pump damaged the module or the module damaged the pump. Since the parts have to be imported from UK, I will call both the pump and module. I don't want to call a module then find out we have to order a pump as well.

I really still don't like the timing retard on this thing. Does anyone here have a hold of a VW FSI engine who can quickly check if this is a normal running condition at idle? Its odd that VW dont publish the ignition timing data.