Technical Multijet no start.

[DaveMcT]

I’m happy to buy MES full version but (as I understand it) the functions are basically the same. It just allows more parameters to be watched and there’s no time limit.

 

[koalar]

The fuel filter unit was replaced early on to remove the high fuel temperature fault code.

We don’t have a confirmed cranking fuel pressure because I don’t own £200 worth of test gauge and fittings. I can only offer what the ECU sends out. It won’t go above 38,000 baud which is pretty slow.

No fancy equipment needed, disabled starting , and plot the rpm and pressure

The HP pump originally fitted to the car had a leak from a cylinder head. Despite new seals, it was unusable.
I bought what was supposed to be new. It clearly was not. But to be fair the price was not high.

Even if leaking the original pump was working up to the chain snapping

The remanufactured pump was given a dose of diesel after fitting to make sure it had some lubrication on startup. But the hard line was dry and the pump was not flooded to as void mess. There would be bubbles in the HP system. There is no bleed point on the common rail.

Who mentioned a bleed point, there's return lines

You can hear the bubble leave and the pump change tone

The HP pressure drop on throttle pedal down has ceased. I’ve not had time to run any further tests but a spin around the block seemed good. BTW there is no random glitch or dip showing on the rev counter. I presume that means the crank sensor is going it’s job.

EGR is behaving itself for now. No odd warnings of any type from that area.

Without data we have nothing to go on
Pump duty cycle
Valve duty cycle
Air flow
Pressure
Boost
Rpm
And so on

The one value we know what it should be we haven't tested, yet we guess at everything else

 

[koalar]

I’m happy to buy MES full version but (as I understand it) the functions are basically the same. It just allows more parameters to be watched and there’s no time limit.

Correct

 

[DaveMcT]

Pump duty cycle - not shown on MES
Valve duty cycle - not shown on MES
Air flow, Pressure, Boost, Rpm, throttle pedal were all done at various times. The latter was the real tell.
I tried disconnecting injector control connectors but ECU did not switch on. I could crank the engine but there was no data available. I did not try the crank sensor (poor access) but suspect it would be the same.

The pump performance was clearly dropping. Time to hitting the low pressure limit got shorter. Eventually it became hard to start. I disconnected the pressure sensor and it started. Plugged it in and it refused to start.

That’s when I accepted my pump was US. I’ve since found a similar advert on eBay with “remanufactured” pump at £150. I now believe they simply have new seals installed.