Jag X-type Crank no start

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picowight
OneWave
OneWave
Posts: 10
Joined: Sat Oct 26, 2019 6:45 pm

Re: Jag X-type Crank no start

Post by picowight » Sun Dec 01, 2019 3:56 pm

Update on this, I was advised on another forum to scope an injector (now with current clamp!) and the common rain pressure.
I used the rulers to get the firing points of the other injectors (labelled in firing order) and it is quite clear that only injector 2 is actually passing fuel, this concurs with scoping inj 2 and crank signal, as I could see the rpm increase only when 2 fired.
An IMV + injectors unplugged pressure test showed that the pump is well short of it's maximum output but still has plenty pressure to flow fuel through the injectors.
The logical conclusion of this is that 3/4 of the recently replaced injectors are blocked, and a swarf check on fuel directly from the rail revealed that the pump is indeed emitting micro particles of metal. :(
So replacement pump, pipes, tank, sender, filter and injectors.

I think this Injector(s) + CR Pressure makes an excellent initial diagnostic test for a diesel, it confirms that injectors are getting firing signal, the pump has decent pressure, that the injectors are passing fuel, that the IMV is working, that there is no air in the rail and I expect (though not tried) that it would show if there was a high level of leak off on a specific injector.
Attachments
injector + FRP 2.JPG

Iver
TwoWaves
TwoWaves
Posts: 90
Joined: Mon May 27, 2019 2:55 pm

Re: Jag X-type Crank no start

Post by Iver » Tue Dec 03, 2019 9:23 pm

Leak off is a test but never definitive.

I think you have blocked or broken injectors.

Swaptronics will help you prove this

picowight
OneWave
OneWave
Posts: 10
Joined: Sat Oct 26, 2019 6:45 pm

Re: Jag X-type Crank no start

Post by picowight » Thu Dec 05, 2019 3:50 pm

Yes- they are a symptom. As above
The logical conclusion of this is that 3/4 of the recently replaced injectors are blocked, and a swarf check on fuel directly from the rail revealed that the pump is indeed emitting micro particles of metal.
Attachments
2019-11-27 15.18.37.jpg

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