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Thread: Injectors ???

  1. 12th October 2007, 01:02 PM #1
    duncanw's Avatar
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    Injectors ???

    I have a 96 Series One Discovery with the 3.9 V8 with about 170k on the clock.

    When I changed my plugs last time I noticed that they were all full of soot, I didn't know when they had last been changed as I had just bought the car and the plugs were the wrong heat range so I put it down to the fact that maybe they hadn't been replaced in a while and someone put the wrong plugs in.

    I checked them again the other night and the same thing has happened, all of them are sooted up.

    In the workshop manual it says that one of the causes for a faulty injector is the plug gets full of soot but I can't image them all going at once ? I'm leaning more towards a faulty Co2 sensor on the exaust or somewhere else, does anyone have any ideas ?

    Obviously its running to rich but I don't know what else controls the fuel / air mixture...
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  2. 12th October 2007, 01:32 PM #2
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    Do they have O2 sensors?

    Check the down pipes from the manifolds to see if you can see any. I wonder 'cos my '95 P38A doesn't have any.
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  3. 12th October 2007, 01:35 PM #3
    PhilipA
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    I don't really want to hog the forum, but all of a sudden there ar elots of 14CUX questions.
    How is your fuel economy?
    If it is about 14-15Lper100Ks on the highway and 20 around town, there is nothing wrong.
    The plugs are sooted every time you start from cold. If you started it to move it,then changed the plugs they will be sooty. How sooty is sooty?They all will have a soot line on the electode side opposite the inlet valve.
    Regards Philip A
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  4. 12th October 2007, 01:37 PM #4
    PAT303
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    Wots a 14CUX??? Pat
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  5. 12th October 2007, 01:59 PM #5
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    duncanw
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    Quote Originally Posted by PAT303 View Post
    Wots a 14CUX??? Pat
    good question !!

    Yeah the fuel economy is about what you said, sooty = "polite way of saying thier covered in $hit".

    I doubt this is normal, unless its a landrover thing to cover the plug in black crap so that it protects the metal from corroding, something similar to the oil leak theory.

    edit. black stuff comming out of exhaust under heavy acceleration as well
    edit of edit : oil level not really dropping so I don't think its burning oil
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  6. 12th October 2007, 02:09 PM #6
    PhilipA
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    Well all the 3.9s run richer than they should, but IMHO the plugs should be pretty clean.
    I took one out a couple of weeks ago, and the insulator was manily white with a bit of soot on the electrode and on one side of the insulator.But they are pretty new, say 5K.
    How old are the plugs?
    Are they the correct heat range?
    They will also get dirty just tooling around town. A good highway blast will clean them every time.
    Regards Philip A
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