Vehicle & Technical > Range Rover
Fuel system problems.
skip:
Well i've got an update. I managed to get a pressure reading from the test port on the fuel rail (found it). it turns out to be about 29psi at idle and rises to around 35 under acceleration.
According to the info I have infront of me the pressure should be between 34-38psi, so that's a little low but i don't think it would be causing the symptoms the disco is suffering, what say you?
Also I've put a multimeter across the injectors on the off side bank, all came back with 16.5 ohms so all seems ok there but i've yet to test the near side bank and the wiring back to the ECU.
Having looked at the test procedeure for the wiring it looks as though the ecu fires off the whole bank of injectors at once as opposed to sequential injection, interesting :-k
kjj0506:
Is the pressure I need for my 4.2 about the same? I am having trouble getting the data. Also , I am curious what the flow should be and if I use an aftermarket in line pump will the factory regulator handle the flow AND the pressure? Not meaning to hi-jack the thread but this is so close to the info I am looking for ..... thanks as always ! [/i]
skip:
Hi kjj0506,
provided that your RRC runs the 14cux injection system then it will almost certainly be the same, especially as the injectors are interchangable with the 3.9 according to what I have read today.
skip:
I've done the final round of tests, Damn that ecu is a PITA to get out!
Anyway it looks a though the injector for cylinder number 5 could be suspect as it's giving a slighly higher resistance than all the others.
I first did the testing from the ECU plug as it details in the instructions I found yesterday, bank B gave exactly 4.5 ohms, so within tollerance.
But bank A was giving a resistance of 4.9 ohms, so I whipped all the plugs off, gave them a clean and put them back together but still no difference. So then I took off each plug and measured the resistance each time. Number 5 gave the least change in resistance, about 6 ohms whereas all the others gave about 8 in total so that must be it.
unfortunatley I can't get the meter probes actually onto the injector plug pins as it's all hidden under the intake :roll: but the ones I have taken readings from have all been 16.5 ohms.
So i'm guessing now that it is really a compound problem of slightly low fuel pressure and an iffy injector :roll:
At least I know now, half way there it's just the expensive bit to come now :D
Range Rover Blues:
The 4.2 is exactly the same as the 3.9 unless there was a specific need to modify anything, it even runs the same dizzy. The small amount of extra fuel is supplied by a longer injector pulse.
It's not uncommon to see and EFi system of this age not being sequential, one of the benifits of non-sequential (I say benifits, sequential systems need to be programmed to do this also) is that the fuel hitting the back of the valve helps to cool it, but they are less fuel efficient.
My LSE has an aftermarket fuel pressure regulator on it, presumably to cope with the 5.0L of Blackpool Rock under the hood.
Skip, where did you find the pressure test port?
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