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Thread: Miss in Rangie engine

  1. 23rd October 2006, 05:48 AM #1
    stevesub
    stevesub is offline Fossicker
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    Miss in Rangie engine

    We have a 2000 Rangie Vogue 4.6. There is a miss from the engine on light throttle at speeds around 60 to 70kph. Full throttle is OK, fuel consumption on the trip computer is around 14.8l/100km so is not too bad (mainly open road speeds to 100kph over last 1000km or so).

    At idle, the engine is also rough. All OK when cold but we have the problem when hot.

    I have booked the vehicle for a service and tune on the 8th Nov but will be looking at it myself over the next couple of days to see if I can find the problem.

    My guess is that it is running too rich. I know the air filter needs replacing but even taking the filter out, the problem is better but still there.

    Any ideas.
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  2. 23rd October 2006, 07:09 AM #2
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    4bee
    4bee is offline Cynical Moi?
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    At idle, the engine is also rough. All OK when cold but we have the problem when hot.

    Does this engine have some sort of Idle Air Control Valve? If so, sounds like it may want a good clean & lube.

    After market, not genuine Dizzy cap fitted?
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  3. 23rd October 2006, 08:14 AM #3
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    Michael2
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    Maybe a loose or cracked HT lead. Start with the cheap & easy to access stuff. Check the rotor cap, the leads (also lead from coil) and the spark plugs. Make sure any earth wires at the coil and distributor are not loose. Spray them with WD40 (or similar) and check tightness with a scewdriver. Check all the vaccuum lines for cracks, pin holes etc.

    If removing the air cleaner has made a difference but not solved it, then it may be a problem that's compounded by the ECU trying to compensate for it, hence with different airflow characteristics it compensates differently. But that's just a guess, as I don't fully understand ECU behaviour.

    Also look around the injectors for staining from fuel leaks, maybe there's a loose or cracked injector line.

    I hope it's easy to find and cheap to fix.
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  4. 23rd October 2006, 10:28 AM #4
    PhilipA
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    Er, 2000 Vogues do not have distributors etc etc.
    I understand that the coil packs and HT leads can give problems, and the problem may lie in that area.
    With a GEMS or Thor engine, probably the best approach is to get a readout of faults from the computer. This will isolate the area of problem if it is electronic such as the O2 sensors needing replacement, the temp sensor ditto , or the MAF ditto but may not ID mechanical faults such as a blown head gasket.
    Modern engines are really out of the scope of DIY unless you invest in diagnostic equipment.
    Regards Philip A
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