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Thread: Rough running on fuel is it injectors

  1. 27th March 2014, 05:52 PM #1
    disco dan's Avatar
    disco dan
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    Rough running on fuel is it injectors

    My 87 rangie which has what I believe a 90 model 3.9 injected engine in it will run on gas but when switched to fuel coughs and splutters before stalling itself. I dumped some injector cleaner and fuel conditioner in it and it seemed to have helped as it will rev but once you let off it dies.

    I'm ditching the gas soon and want to see where to start checking before pulling the engine open to change the injectors but should and will do that either way.

    Any ideas or fixes
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  2. 27th March 2014, 06:40 PM #2
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    rangietragic
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    If any dual fuel vehicle isn't run on petrol briefly at least once a week the injectors will foul up.Learnt this the hard way
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  3. 27th March 2014, 06:41 PM #3
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    Yeah I know this but don't think previous owner did
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  4. 27th March 2014, 07:07 PM #4
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    Ancient petrol won't run well. fresh fuel is essential.

    The fuel pump may be stuffed, do a pressure test.

    The MAF may be stuffed from a backfire.

    The injectors should fire each time you start the engine, this keeps them alive longer. If they have had no petrol at all for 6 months or longer they will be stuck closed. It's probably easier to find a set of second hand injectors off a non gas engine.
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  5. 27th March 2014, 07:32 PM #5
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    I put fresh 95 in it and an octane booster plus conditioner and an injector cleaner

    How do you do a pressure test as it pumps out when I disconnect it from the filter

    Will get a second hand maf to test

    Will also get a set of second hand or refurb injectors but which ones as I remember you saying 90 model commondore or ford. Otherwise will contact a land rover wrecker
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  6. 28th March 2014, 12:04 PM #6
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    Just priced new ones for $140 each or cleaning them for $400.
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  7. 28th March 2014, 12:49 PM #7
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    Fuel pump pressure is checked by using a fuel pressure gauge on the fuel pressure test fitting on the fuel rail at the inlet manifold. If in doubt seek a mechanic with a proper pressure gauge to test it for you.

    Injectors lurk in the sheds of anyone who's wrecked a Disco or RRC, put up a wanted notice on the forum if you need some.
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  8. 28th March 2014, 03:11 PM #8
    Tas79 Guest

    Smile

    Just rip it out and put a ford v8 in it
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  9. 28th March 2014, 03:26 PM #9
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    I could pro banal get one cheap too hmmm.
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  10. 28th March 2014, 03:43 PM #10
    sheerluck Guest
    Quote Originally Posted by disco dan View Post
    Just priced new ones for $140 each or cleaning them for $400.
    Get some Bosch Gen III ones from the US. Cost you a hundred bucks or so. that's what I did on mine.
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