Freelander 1 Say hello to new friend ! TD4 needs new engine.

While waiting for the high pressure gauge, decided to fit a spare HP pump. For info, no need to remove starter or coolant fitting, remove regulator so that you can get to the bottom nut, lift engine a bit with mount off and straightforward job.

Now have a reliable fuel rail pressure of .
27,000 to 40,000 kpa.

It refuses to fire the injectors. Tried a spare injector connected up outside engine with cylinder 1 power lead and no spray at all from injector.

Have checked all connections, substituted cam and crank sensor. No fault codes shown at all now.

Beginning to scratch head. Even if diesel has gone bad it should spray it ??

Open to any ideas. It's an open book as someone has played with it.

Lack of fault codes is confusing.

Good low pressure and high pressure rails.

No fuel to cylinders. Injectors taken from a running vehicle and fitted with new washers and O rings.

What voltage should you see on injector? Rave says 12v on red and ecu switches ground. Is it that simple? Thought they were piezo. If someone has a voltage or waveform that they can share for a working vehicle that would be good.

Thanks.

I don't want to doubt RAVE but is this correct?

Each injector has an electrical connector which provides a 12V direct supply from the main relay and connections to
the ECM. If the battery voltage falls to between 6V and 9V, the operation of the injector solenoid will be impaired
affecting, acceleration, maximum speed and idle. Battery voltage below 6V will result in the injectors not operating.
Each injector solenoid is controlled separately by the ECM which provides an earth path to open the injector nozzle
at the correct time and for a calculated period to provide a metered injection of fuel into the cylinder. The ECM uses
signals from other sensors and a programmed fuelling strategy to ensure that the precise amount of fuel is injected
at the correct timing for maximum fuel efficiency and minimum emissions.

Need to compare to a working vehicle. I get 1.1V on each red/white injector feed wire wrt ground.

If someone has been poking around and not managed to fix this, and you're bit by bit confirming the individual components, does this point to faulty wiring or damaged ECM(s) somwhere that is obviously difficult to find? Water ingress or something like that resulting in electrical system woes?

I'm hoping a logical approach will not only be educational but also fruitful !

I have a feeling you might be right although I need to know how the injectors are fired and whether RAVE is correct. An alternative is to take voltage readings from my working car. I certainly don't have battery voltage on each injector as RAVE suggests.

My pressure gauge arrived with a bsp to M12 x 1.5 adaptor which allows it to fit the injector end of the fuel pipes or in place of the fuel rail pressure sensor.

All good and in excess of 6,000 psi when cranking.

Now with an injector out and cranking I get blobs of fuel on kitchen paper but not the jet that I expected and saw in a video.

Now discharging unburned fuel as white smoke in EGR exhaust outlet.

Still refuses to fire, much coughing though!

Thought I'd found the problem as when I removed an injector to check for fuel, the copper washer had no witness marks on it. New as supplied 1.4mm thick. Originals after compression 1.9mm thick. Refitted old washers. No change.

Time to check compression now. None of the glowplugs want to unscrew and don't want to break them. Has anyone found a dummy injector to test compression this way??

Incidentally. RAVE is wrong. There is no 12V supply on the injectors with ignition on. There is 1V. Same on a working vehicle. As injector is only 0.5 Ohm, when not cranking the 1V appears on both injector wires wrt battery -ve.

Voltage across injector wires increases when cranking but not possible to read with meter. Need a new scope !!

So we now have a cleaned up, clean oil, replacement injectors, replacement fuel pump and we have white smoke.

Thinking compression must be at fault now.

Anyone worked out how to measure it through the injector hole??

Thanks.