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P38A Compression Test Results.

Discussion in 'Range Rover' started by MrGorsky, May 7, 2020.

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  1. Grrrrrr

    Grrrrrr Jedwood Spannerhands

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    That's a relief. Tried making a pressure testing adapter out of an old spark plug and an old valve from a bike inner tube last night. Utter failure. Drilling through a spark-plug is hard as hell!
     
  2. norseman

    norseman Well-Known Member

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    There are similarities in the ownership of my '87 classic. I bought it nearly 12 years ago, I am the third owner, the car is just coming up to 60K & there was a gap of a couple of years in the service record. I recall one year where the car only clocked up 14 miles in a year, the MOT being conducted 7 miles from the owner's address :cool:
    Good to hear that you want to repair the V8, I wish you well with the task.
     
  3. Ratae

    Ratae Well-Known Member

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    Plug leads are a service item. Are these the ones that were on it when you bought the car?
    Fit a good quality set not ebay cheapies. I've never felt the need to use magnecor type.
     
  4. MrGorsky

    MrGorsky Well-Known Member

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    Good god no! I changed them when I got it! They've been changed again last year, just Lucas ones, not Magnacor, but I do change them at the service interval.
     
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  5. MrGorsky

    MrGorsky Well-Known Member

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    Time to draw a line under this thread I think.

    I've put it all back together. New spark plugs, new manifold gaskets, new CATS (see this thread) new studs for the manifold flanges, and new 3/8 bolts for the manifold to cylinder head joint.

    It's all running much much better. No chuffing, no misfiring, it's smoother and quieter than it's been for a while. I've done a trace with the Nanocom, and it all appears to be running and fuelling as it should.

    What the problem was I don't know, but my original LR CATS look to be in pretty good shape, and none of the spark plugs was loose when I changed them, so I only assume it was a leak from between the head and the exhaust manifold on the left hand side. That's where the chuff was loudest.

    I'll just have to live with the low compression for the time being, and keep my eye out for a used Turner engine to replace mine with...

    The only thing is it's just failed to restart after the test run. I opened the bonnet and let it cool, and it started up first time. It's only ever done that once before, and of course I've tried hot starting it a few times more, and it start up just fine! Could this be low compression related do you think?
     
  6. Henry_b

    Henry_b Rover V8 Powered

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    How old is the Crank position sensor?
     
  7. MrGorsky

    MrGorsky Well-Known Member

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    About 10 days!
     
  8. Henry_b

    Henry_b Rover V8 Powered

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    Thats alright then!!
     
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  9. MrGorsky

    MrGorsky Well-Known Member

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    It's more of a "trying to start and just petering out after a few seconds" not starting, rather than "just not starting" not starting.
     
  10. Datatek

    Datatek Well-Known Member

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    Fuel starvation or vaporisation?
     
  11. MrGorsky

    MrGorsky Well-Known Member

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    That's what it feels like to me @Datatek

    It's due a new petrol filter, but I need to do that fuel pump flow rate test too.

    How do you stop fuel vaporisation? The fuel temp sensor seems to be working perfectly well according to the Nanocom.
     
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