Touareg: 2007 V6
Join Date: Jun 2015
Second Vehicle: VW 2
Thanked 0 Times in 0 Posts
2007 V6 fuel rail chirping/noise
I have a 2007 Touareg with the 3.6 V6. It has recently started making a chirping noise in the upper fuel rail. The only code that it gives is a P0088 Fuel Rail/System pressure too high. I replaced the HPFP (High Pressure Fuel Pump) that is on the engine, same issue. When I disconnect the N276 Pressure regulator connector, the noise goes away, the engine will idle ok, but will not accelerate due to fuel pressure being too low. When I use my VCDS, the fuel rail pressure is approximately 125 bar and does not change with engine RPM or load. When I accelerate hard, the noise goes away due to the fuel demand being almost equal to the fuel pressure. Any suggestions to look at before I take it to the dealer?