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Thread: 4bd1

  1. 26th June 2007, 10:15 PM #1
    County3.9's Avatar
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    4bd1

    Question for the ISUZU experts. Just came back from a trip and got 8km/ltr (12.4ltrs/100km). This was in a 4speed county, maintaining about 105kph on the highway,no roof rack,family of 5, not overloaded. My old man gets much better out of his county
    Before I did this check I thought I noticed a drop in economy and now I've confirmed it! What should I check first??
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  2. 26th June 2007, 10:21 PM #2
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    The handbrake.
    Cheers

    Mick

    1999 Land Rover 110 Defender TD5 Cab Chassis
    1985 Land Rover 110 County 4.6 EFI V8
    1993 Track Trailer camper
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  3. 26th June 2007, 10:26 PM #3
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    Air filter.
    tyre pressure
    all oils....

    remeber theres differnet ratios in different boxes/tcases/diffs which will also account for the difference.....

    if its none of those grab a digital "laser" thermometer (the point and shoot ones) and from stone cold monitor each individual exhaust port on the manifold and see if they all come up about the same. Its ok if they heat up faster from the front to the back so long as its not a massive difference say more than 10 deg C as this is due to the fact that the fan and the coolant are up the front and the rear cyl gets hotter first. once at normal operating temp they should all normalise to within 1 or 2 deg c.
    Dave

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  4. 26th June 2007, 10:28 PM #4
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    Quote Originally Posted by D110V8D View Post
    The handbrake.
    Handbrakes not grabbing.
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  5. 26th June 2007, 10:29 PM #5
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    Whats that looking for Dave?
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  6. 26th June 2007, 10:42 PM #6
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    air filter, loss of air in = rich running = bad fuel economy

    tyre pressure, low pressure = higher rolling resitance= bad economy and short tyre life

    oil, burt/sludgy oil= oil cooler not working corectly and core temp in engine high= high precompression temp=bad fuel economy

    and the check on the exhaust is a quick way of making sure you dont have a lazy cylinder not pulling its weight or one pushing too hard, not achieveing anything and just burning fuel
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


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  7. 26th June 2007, 10:44 PM #7
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    i'll also take a stab and say monitoring the individual temps will tell you if the ignition is at the wrong point of the cycle...

    anyway, Dave's your man for 4BD1 info, it's his job afterall
    Last edited by EchiDna; 26th June 2007 at 10:50 PM.
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  8. 27th June 2007, 06:42 AM #8
    Bigbjorn
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    Thermostat. The 4BD1 is sensitive to operating temperature, and if the LR cooling system is up to scratch, will not reach the optimum temperature for both economy and performance. If you need one, don't go to an LR dealer, too bloody expensive. Go to an Isuzu truck or industrial engine dealer.
    URSUSMAJOR
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