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fuel pressure regulator plumbing

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muddydigger:
ok so on this ere 3.9 the fuel presure regulator is in the sameplace as the 3.5 but the pressure regulator onthe 3.5 has a vacume hose on the back of the plenim chamber, wher does it go on the 3.9?  also ther is on the 3.9 an electronic jigger screwd to the pressure regulator on the 3.5 but not the 3.9 should ther be one?  still having difficulties identifing these two wires left in the new loom.

Range Rover Blues:
Err, I'm confused by that, we need pictures.

<emawhile on the 3.9 there will be an idles speed stepper motor housing on the back of the plenum, 4 wires go into it.  on the bottom of the mounting plate you will find the vac hose connector for the fuel regulator.

No idea what you mean about the electronic thingy there though.

Where abouts are these wires you can't fit? are they perhaps for the lamda sensors?

muddydigger:
Thank you now we are getting some where, the steper motor must me the electronic jigger i was refering to on the 3.5 which had two blue wires. the steppper motor for the 3.9 is that black? and i cant sea any wires to it! would they be the whit wand grey and white wires. Apperently the car the engine came out of never had lambada sensors in and the wires are taped up, so im told by the chap i bought the engine from.

muddydigger:
Ok scrub the that last comment ive found that ther ARE four wires to it and i found the vac hose and thats made a big diffrence to it now it runs a lot better. still no idea about these wires though will put picture on the board later  thnak you so much for sticking with me on this, much appreciated.

Range Rover Blues:
I'm not so familiar with the 3.5 RFi (often refered to as the 'flapper' system) but it would have had an extra injector I think on the RHS of the plenum.  I don't know about any idle speed valve though.

Can I assume you have a full 3.9 wiring loom to go with the engine? these are pretty much a stand-alone system ie a separate loom so there shouldn'y be any spare wires unless it's for somehting like the charcoal canister which wasn't always fitted.

I'd strongly suggest you try to get a haynes manual as, unlike the Disco, it's actual really useful.

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