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Thread: Phantom rough idling issue in a straight V8 Discovery 2

  1. 12th June 2024, 11:48 AM #11
    shack
    shack is offline ChatterBox Supporter
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    Nanocom shows g/s, as I said... You are always better off with dedicated tools.

    As to what your problem is, it could be anything, if course a dedicated tool MAY show a fault code that the one size fits all solutions you have been using don't.

    Possible failures are O2 sensors, cam position sensor, coil packs, spark plugs, spark plug leads etc etc.

    (I haven't re read the post to see what you have changed.)

    I don't think aftermarket tools will show the cam sensor properly from memory.

    There is also knock sensors and of course the fuel gauge in the tank that can cause running issues, although probably only when you have a very low tank with a gauge not showing that.

    There isn't 2 ECU's, I'm aware that car scanner reports that.

    The NAS vehicles also had O2 sensors after each cat, ROW spec don't, they only have upstream sensors... It's possibly confusing itself there somehow but I don't see why??
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  2. 24th June 2024, 11:20 PM #12
    MAF Diver
    MAF Diver is offline Fossicker
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    Exclamation

    So I finally made a DIY smoke machine and have smoke coming out from somewhere deep in the engine.

    But I can't see where exactly? Here's a video:






    Would you say it's a big vacuum leak?





    Questions:

    1. What part(s) are easy to remove to get a better look?

    2. Should I connect the smoke machine to somewhere else as well to check? Currently fed in from where the MAF would be.

    3. Is it safe to drive the car while I figure out the source/fix? Or can I damage injectors, O2s, cats, etc.?



    tl;dr
    - Coming from deep somewhere near the injector area? Gasket? There's also a few smaller hints here and there in my videos.
    - None coming from the oil cap when removed.
    - A bit coming from brake booster hose. But not much?

    Birds eye view from top down:

    Here you can see it also comes out a bit up top nearer to the windshield.

    Air leak from booster cable:



    Taking off the oil cap:

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  3. 26th June 2024, 07:17 AM #13
    shack
    shack is offline ChatterBox Supporter
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    Running a petrol engine too lean can definitely damage it. Cats and valves are at risk.
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  4. 26th June 2024, 09:50 AM #14
    PhilipA
    PhilipA is offline Swaggie Subscriber
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    Seeing it is in the V my guess is that the inlet manifold (valley) gaskets to heads are leaking. They can get loose over time. Or the end seals of the valley gasket have failed.
    Regards PhilipA
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