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Thread: LT35 Diesel Engine 'misfire'.

  1. #1
    Junior Member
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    Dec 2018
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    Bristol UK
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    LT35 Diesel Engine 'misfire'.

    Hi,

    Here's a real head scratcher.


    The vehicle, a camper, has the D24 2.4 6 cyl non turbo diesel.
    184,000 miles and used with care over the past 24 years of our

    ownership. Annual oil/filter changes and fuel filter changes. No veg
    oil ever used. Slow warm ups before using higher revs.

    Symptoms: Engine runs smoothly at low revs, up to around 45mph in top &
    from 50 + also smooth. Runs rough between 45mph & 50mph, just
    like a misfire on a petrol engine. Same symptoms for similar revs
    in the lower gears, so its rev rather than speed related pointing to
    an engine issue. Particularly noticeable when you hit the 'bad' spot going up hill.
    No smoke when warm. Symptoms came on over a two day period around 3 months ago
    but haven't got any worse.


    Performance, such as it is, is about the same as ever and MPG again
    pretty much the same at 27mpg. Engine sounds ok when running smooth.
    ie, no nasty noises. Same when 'misfiring'.

    What have we done so far?

    - Injector pump changed for recon unit with 12 month guarantee.
    - Injector nozzles professionally cleaned.
    - Injection pump timing checked as ok.
    - Fuel filter changed.
    - Fuel system bled several times, no sign of bubbles in the
    supply pipe to the injection pump.
    - Vehicle run from separate fuel supply to eliminate any fuel
    pipe issues.

    Local diesel expert (well thought of) is mystified and we are getting
    poorer by the day!

    If anyone has come across similar symptoms and has any ideas as to
    the cause, I'd love to hear.

    Regards,

    Saljo
    1989 LT35 2.4 TDI

  2. #2
    Junior Member
    Join Date
    Dec 2018
    Location
    Bristol UK
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    Hi,
    Sorry to be a pain - I'm new to the forum, but I had two replies to my original post to which I responded.
    I can't find any of these responses. Can the Moderator help please as I have some further information?
    Thanks,
    Saljo.
    1989 LT35 2.4 TDI

  3. #3
    Administrator Crasher's Avatar
    Join Date
    Apr 2006
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    Nottingham, England
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    2003 Skoda Octavia VRS Estate. APR 98RON remap, APR R1 diverter valve, Jetex exhaust, K&N panel filter, 7.5x18 Alutec Monstr wheels with 225/40 18 Uniroyal Rainsport 3 tyres.
    2006 Polo GTI 1.8T, APR 95RON remap
    1988 Golf 2 GTI 16 valve, 2.2 with Weber Alpha injection
    1983 Golf 1 GTI 8 valve, 2 litre with Eurospec racing 42/36 head
    1972 1302LS auto 1641cc conversion

    Vile Invention

    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:

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