Got a Doblo 1.3 multijet diesel in for running fault. It's on a 58' plate with engine number 223A9000. Complaint is lack of power below 2,000rpm. Once at 2,000 rpm, it's off like a rocket. Customer also says at time there is white smoke. Not really seen any myself. This car was in a month or so back and had lots of fault codes due to customer 'playing' around!
We had someone look at it and main code to return was fuel pressure, but everything checked out at the time. So it was suggested to us to fit a fuel filter first. We did that and fault still there. Customer took it away and told once I had been on the pico course, they could come back in
Deep down we thought they would've taken it elsewhere by now!
So here I am wanting some pointers and a helping hand, please
Code read and codes stored were, glow plug signal (p0683), B-Can line (U1602), U1700 Can network (NCM - NBC), Can line error, wiring faulty (U1601) and also a code with no description 0246 (2, 38, c4, 26) All codes except last one cleared, but after a few more tries, final cleared and none come back yet.
Tests done are comparison compression test, looked fine. Low pressure fuel delivery to HP pump after filter was 4.5 bar and holds when revving engine. About 1 bar higher than autodata says. Have scoped fuel rail and HP pump sensor, injectors and MAF sensor and have attached for people to browse and give their opinions on the results. To me, it all seems ok, but would just like a second opinion.
I notice the smell from the exhaust is like an engine with no cat fitted, but a bit worse. It does have a dpf, but there is no O2 sensor, only an exhaust temp sensor beside the dpf. I scoped this and was getting about 1.1volts with very little change to the reading, is this normal???
Sorry for the long post, and do appreciate anyone taking the time to read it and offer their thoughts.