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Thread: V8 fuel injectors.

  1. #1
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    V8 fuel injectors.

    Can an someone tell me if the fuel injectors from the 3.9 (ERR722) can be used in place of the injectors for the 3.5 (ERC3260)?

    I fear I have a or some leaky injectors and the newer style are half or less the price. The parts breakdown only shows the injectors as being different, all other associated parts are the same.

    Thanks.
    '15 Discovery 4 HSE- The family bus and the kids like it!
    '89 RRC- My favorite of the bunch!
    Ex '03 Commodore 'S' ute- 450hp of uncracked 5.7lt and 6 speed manual uteness - Still crying that its gone
    Ex '06 GLXR Triton- *Gone and forgotten*

  2. #2
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    Totally different at the upper ends, the 3.5 has short rubber hoses to each injector. I'm told that the VL Commodore/Nissan Skyline 6 cylinder of the later 80's runs similar injectors. I once acquired a set of 3.5 injectors off a Rover SD1 saloon, didn't pay much for them luckily. XJ6 Jags ran them too.

  3. #3
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    Yeah I did see that on both the parts diagram and Google images. But there is no listing for a different fuel rail. Il see if I can find a different fuel rail. Thanks for the tip on the commodore ones, I was aware of the Rover/Jag/911s/Alfa Romeo ones, but unfortunately it seems there is a high mark up on all.
    '15 Discovery 4 HSE- The family bus and the kids like it!
    '89 RRC- My favorite of the bunch!
    Ex '03 Commodore 'S' ute- 450hp of uncracked 5.7lt and 6 speed manual uteness - Still crying that its gone
    Ex '06 GLXR Triton- *Gone and forgotten*

  4. #4
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    Can you take off the rail with the injectors still attached. Fill the rail with fuel and pressurise it. I did this with my P38 rail and after 12 hours there was the same pressure in the rail.At least you can check them out and maybe avoid the cost. If you have a bad one I think I have a new 3.5 injector in storage somewhere.
    If you want to change to newer injectors I have a friend who has done it along with getting top end adaptors made. Ill get the details to you later - but both engines have been 3.9 and above.
    The cars both run extemely well compared to OEM. Lately Retuning of the 14CUX ECM was done via wide band and Software. These cars pull noticably better than standard.
    1998 D1 in showroom condition, 1999 D2 TD5 with everything, 2000 P38 showroom condition.
    Freelander 2 2012
    1992 RRC sold and now pranged.

  5. #5
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    Quote Originally Posted by peter51 View Post
    Can you take off the rail with the injectors still attached. Fill the rail with fuel and pressurise it. I did this with my P38 rail and after 12 hours there was the same pressure in the rail.At least you can check them out and maybe avoid the cost. If you have a bad one I think I have a new 3.5 injector in storage somewhere.
    If you want to change to newer injectors I have a friend who has done it along with getting top end adaptors made. Ill get the details to you later - but both engines have been 3.9 and above.
    The cars both run extemely well compared to OEM. Lately Retuning of the 14CUX ECM was done via wide band and Software. These cars pull noticably better than standard.
    I probably can. But I'm in a "get it going" sort of situation as we are moving at the end of the year and I have a lot of other stuff to get done before we move. I'd like to just fit known good parts and take it from there. It is also the flapper type, 4cu.

    As is stands, fuel pressure will drop to 20PSi and hold for maybe 30 seconds before dropping off. It only runs without the fuel pump relay in and as soon as I plug it back in, the car stalls due to flooding.

    I have fitted a rising rate fuel regulator as I thought the original was leaking through the diaphragm and getting fuel that way. But now I see that the only other way of getting fuel is if one or multiple are leaking or open.

    The car was averaging 18lt/100 (all 100kmh driving) before I pulled it off the road.

    If I get time today I will try unplugging each injector and see if it ohms correctly and runs any different.

    I also looked at VL injectors today and unfortunately aren't much different in price. But, the turbo injectors run 260cc, so there might be gains to have when I get to rebuild this engine.
    '15 Discovery 4 HSE- The family bus and the kids like it!
    '89 RRC- My favorite of the bunch!
    Ex '03 Commodore 'S' ute- 450hp of uncracked 5.7lt and 6 speed manual uteness - Still crying that its gone
    Ex '06 GLXR Triton- *Gone and forgotten*

  6. #6
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    The fuel rail is of course entirely different, having hose barbs instead of sockets for the o-ring ends of the later injectors. You could change the entire fuel injection manifold over and run it on a 14CUX system, providing you can find the parts cheap. The old system is just too primitive for my liking. The 3.5 injectors run through a resistor block, the 3.9 ones are fired directly by the ECU.

  7. #7
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    Think the early flapper system runs the injectors at 3 or 5 volts too, hence the resister block. A dud coolant sensor can give you that problem also, will just run if revs kept up, but very rich.
    '93 D1 V8 auto
    '93 D1 200Tdi 2-door, ARB's, MD transfer, sill tanks, winch, 2"lift.......
    '95 D1 V8 auto......gone
    '86 V8 RRC.....gone

  8. #8
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    Quote Originally Posted by Rick1970 View Post
    Think the early flapper system runs the injectors at 3 or 5 volts too, hence the resister block. A dud coolant sensor can give you that problem also, will just run if revs kept up, but very rich.
    I found a test procedure for the Rover injectors (same thing - different packet) and they said to use 3V to operate.

    I didn't think about the coolant sensor. I replaced it a couple of years back and then the car gradually started doing this thing. Thanks, something else for me to check. Will also isolate the cold start injector incase that is open.
    '15 Discovery 4 HSE- The family bus and the kids like it!
    '89 RRC- My favorite of the bunch!
    Ex '03 Commodore 'S' ute- 450hp of uncracked 5.7lt and 6 speed manual uteness - Still crying that its gone
    Ex '06 GLXR Triton- *Gone and forgotten*

  9. #9
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    Quote Originally Posted by bee utey View Post
    The fuel rail is of course entirely different, having hose barbs instead of sockets for the o-ring ends of the later injectors. You could change the entire fuel injection manifold over and run it on a 14CUX system, providing you can find the parts cheap. The old system is just too primitive for my liking. The 3.5 injectors run through a resistor block, the 3.9 ones are fired directly by the ECU.
    I ended up doing a search to see what's out there and in all honesty, it would be less of a hassle doing an LS conversion.

    Not only is the rail different, but how you plumb up the fuel is too different for it to be a simple task and I live in Katherine, so it wouldn't be easy or cheap.
    '15 Discovery 4 HSE- The family bus and the kids like it!
    '89 RRC- My favorite of the bunch!
    Ex '03 Commodore 'S' ute- 450hp of uncracked 5.7lt and 6 speed manual uteness - Still crying that its gone
    Ex '06 GLXR Triton- *Gone and forgotten*

  10. #10
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    In a pinch, I once used a old solenoid coil that had about 150 ohms resistance to replace a dud coolant sensor in my old rangie to get it mobile again. Not the best, but got it running and a useful test to prove the sensor was at fault.
    '93 D1 V8 auto
    '93 D1 200Tdi 2-door, ARB's, MD transfer, sill tanks, winch, 2"lift.......
    '95 D1 V8 auto......gone
    '86 V8 RRC.....gone

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