volvo 240 rough running

Discussion in 'Volvo 240' started by Doug Hall, Oct 22, 2004.

  1. Doug Hall

    Doug Hall Guest

    Hi there, wondering if anyone can give some advice?

    I've a '88 Volvo 240 GL, 90K on the clock, which recently started
    running really rough. It sounds really noisy, and hardly acelerates,
    even with the gas pedal/accelerator pressed all the way down.

    It idles very roughly, at about 400/500 rpm, but doensn't stall.

    There doesn't appear to be an Air Mass Meter, so I'm assuming this is
    an early type of fuel injection, the K-Jetronic, for example?

    Sounds like it isn't firing on all four cylinders, (would that also
    cause the severe degradation in acceleration?).

    Doug Hall, Oct 22, 2004
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  2. Doug Hall

    James Sweet Guest

    If this car has K-Jet (still amazes me they used that old system so long
    over there) then the first thing I'd do is check very carefully for vacuum
    James Sweet, Oct 22, 2004
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  3. I'm pretty sure that it will be K-Jet; I think it was a couple of
    years later that we finally moved on. It may have been old, but it was
    extremely reliable and durable. I'm surprised that carb. models were
    still available alongside K-Jet.

    Certainly check for air leaks, including the injector seals (squirt a
    little water over the injector seats while the engine is running - if
    it gets drawn in, the engine will falter or stall) and the pipes that
    go to the auxiliary air valve (sits on the side of the valve cover on
    the top of the engine), and make sure that the fat rubber boot under
    the inlet manifold is still properly in place between the throttle
    body and the air flow meter. Also squirt a little water around the
    inlet manifold gasket.

    But I would start with checking the ignition componets, particularly
    the distributor cap and rotor arm. If you have access to a timing
    light or spark tester, make sure you are getting a healthy spark to
    all four cylinders.

    When you say it sounds really noisy, where from? What sort of noise?

    Does the problem change as the engine warms up?

    Stewart Hargrave

    For email, replace 'SpamOnlyToHere' with my name
    Stewart Hargrave, Oct 22, 2004
  4. Doug Hall

    Doug Hall Guest

    I had a friend round today, and tried starting it up again. There was
    definately unburnt fuel vapour being blown out of the exhaust. The
    contacts inside the distributor cap were green (copper oxidation?), so
    cleaned them off, cleaned the HT leads, and checked for corrosion at
    the spark plug and distributor ends. It ran ok when restarted, but
    reverted back to it's misfiring at 500rpm after about 30 seconds.

    Pretty sure it's an electrical problem now, when it is light again
    outside, I'll check again further.
    The engine. It was consistent with misfiring.
    When I had the problem the other day, it carried on until I was able
    to get the car home, and the engine was up to temperature.

    Thanks all for the advice so far!

    Doug Hall, Oct 22, 2004
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