My Mitsubishi Pinin 2.0 gdi has misfire and serious power loss above 2250rpm, the rev limiter cuts in at 4000rpm. Flooring the throttle above 2000rpm causes the engine to die. There is a loud clacking noise from the low pressure fuel pump in the tank which is directly related to engine speed (although the pump is electric). When warm this noise reduces. The Mitsubishi garage in France (where I keep the vehicle) ran loads of tests and said the low pressure pump was fine and the high pressure pump appeared to be ok as well, though the fuel pressure on the high pressure side was showing as only 0.4 bar on the diagnostic. They suggested that a faulty fuel pressure sensor was the problem.
What could be the cause of the noise from the in-tank pump? A serious misfire and engine cut-out (rev-limiter) above 4000rpm has existed for some time, whereas the fuel pump noise is recent.
Anyone out there got any ideas before I replace the fuel pressure sensor?
Thanks, and what a useful and interesting site!