The V8 Owners Forum -

Just a quick update, got the part today but it was wrong. right for the chassis number but wrong for my Disco !! ah well they have the right one and its on its way. Im away from tomorrow till monday so will have to leave it for now. will post up when the correct part turns up and Im back home !!!

Andy

Hey Andy

If you need a hand give me a shout. We need to get Wallet back on the road so we get get out lanning!

OK Then Good news and Bad new..
Good news is, Ive fitted a new fuel pressure regulator
Bad news, it didn't fix it

Although the day is not completely lost.
It runs on gas.
I have a question.

1. how are injectors wired ?
2. how are they fired ?

My reason for asking is this. After a process of elimination I have worked out ( i think ) that if fuel injector 4 is connected it floods.
If i unplug the connector by its lead it all runs fine. (all be it on 7 on fuel)
When on LPG, If I unplug all the injectors on the even bank it runs on LPG, if I connect the injectors one at a time it falters when i connect injector 4. If I only connect injector 4 and leave all the others unplugged (even bank only) it falters (the engine)
if I plug any of the injector connectors onto 4 it falters.
if I plug connector 4 to any other injector it makes no difference

I had an idea that the injectors are fired off 1 bank at a time, not individually? i.e. injectors 2,4,6,8 are opened together. so any of the even leads could be connected to any of the even injectors.
If this is so, if the lead to injector 4 doesn't open any other injector then It must be good. (conversely any of the other injector leads can open injector 4 and not their own)

there is an injector interrupt for the LPG system.
It (when the LPG is on) interrupts both the blue and yellow wire and the blue yellow white wire in the footwell area, I didnt install this part of the system but if this has isolated the injectors how is the injector wiring still operating the injectors.
Are they fed a live all the time ? and the earth is switched, if so do injectors fail to earth ??

Sorry for all the questions, but if anyone has any thoughts I would appreciate it (or questions for me to answer to make it clearer)

Andy

Ive just metered the pins on the injectors for continuity to earth.
All the on the problem bank, 2,6,8 have no continuity to earth but my suspect injector shows continuity to earth on both pins.
so if they are fed a constant live and switched on their earth that might be my problem...

Andy

Looking at the RAVE circuit diagram (below) it does show constant live to the injectors from the fuel load relay Brown/Orange wire on each injector with the switching earth from ecu by yellow/white wire.

You are also correct the ECU just fires them by bank

Bin injector 4 and replace fella
Brand new £24.99+vat from Island 4x4 HERE

Or you could get a whole 2nd hand injector rail with 8 injectors for £34.99 plus post HERE

You could try swapping no. 4 injector with a different injector just to see if the problem moves with the injector.

Chris.

OK all fixed !!!
Turns out it was injector No 4 it was shorting to earth so as soon as it got a +ve it was operating.
The relays to turn off the injectors when on LPG turn off from the earth side ( I have since discovered) so even when on gas that injector was still pumping petrol in.

Why though because of once injector failing as it did would that bank all get over fuelled ??

Thanks every one for there help though

Andy

Glad you got it fixed!

Chris.

Excellent news well done mate