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Thread: RRC Fuel consumption drama

  1. 30th December 2008, 07:07 PM #1
    rangierover
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    RRC Fuel consumption drama

    Hey guys and gals, i have been hanging around this forum for a few months now, without posting until recently.

    Anyway my problem is how much fuel my 1992 range rover classic is using.
    when i bought it about 5 months ago it was very reasonable for a v8 4wd, using only 14-15 litres per hundred with me giving it a fair bit of boot most of the time.
    since then i have kept it in service all filters are clean and it has good oil, and runs perfect apart from it is using now 25-30 liters per 100kms. i have since fitted 31 inch all terains. and that is basically the only mod besides little things like draws and batteries.

    Any ideas on why it is such a pig on fuel?
    is there any way i can tune it at home?

    Andrew
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  2. 30th December 2008, 07:24 PM #2
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    BigJon
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    Check the vacuum advance diaphragm. It is a common failure and causes high fuel consumption.
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  3. 30th December 2008, 07:42 PM #3
    rangierover
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    sorry to sound ignorant, but where and what is the vacuum advance diaphragm?
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  4. 30th December 2008, 08:10 PM #4
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    BigJon
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    It hangs on the side of the distributor. It has a vacuum hose going to it.

    It is there to advance the ignition timing at times of high engine vacuum (light throttle cruise), thereby giving better economy.
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  5. 30th December 2008, 08:33 PM #5
    Grumbles
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    And when you take it off to check don't lose the little screw which holds it or the lock washer and when replacing Loktite it back in as well.
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  6. 30th December 2008, 08:38 PM #6
    Rangier Rover Guest
    Also make sure thermostat is working ( 83 Deg I think) and test Temp sensor resistance as may be tricking ecu to running cold.
    Try all the above with a good tune up etc 1st.

    The tyre change should not make that much diference. If were 35's with 3.54 may though.
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  7. 30th December 2008, 08:48 PM #7
    rangierover
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    Thanks for your advice guys, ill check all of those things when i get home tomorrow.
    Wish me luck!
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  8. 30th December 2008, 08:51 PM #8
    Rangier Rover Guest
    Quote Originally Posted by rangierover View Post
    Thanks for your advice guys, ill check all of those things when i get home tomorrow.
    Wish me luck!
    GOOD LUCK
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  9. 31st December 2008, 07:46 AM #9
    PhilipA
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    Could be a bad or dirty MAF which causes the ECU to into "limp Home " mode.
    Limp home mode is very rich.

    So clean the MAF wires by spraying non residue contact cleaner ( available at Jaycar) into the small hole you can see through the screen on the front of the MAF and bend the blades in the connector a little bit to get a good contact in the plug.
    Obviously you have to remove the MAF to do it and take out the screen.
    You have not fitted a K&N I hope .
    Otherwise agree high possibility of dead vacuum advance and /or faulty thermostat or temp sensor.
    Regard sPhilip A
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  10. 31st December 2008, 08:11 AM #10
    PhilipA
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    Could be a bad or dirty MAF which causes the ECU to into "limp Home " mode.
    Limp home mode is very rich.

    So clean the MAF wires by spraying non residue contact cleaner ( available at Jaycar) into the small hole you can see through the screen on the front of the MAF and bend the blades in the connector a little bit to get a good contact in the plug.
    Obviously you have to remove the MAF to do it and take out the screen.
    You have not fitted a K&N I hope .
    Otherwise agree high possibility of dead vacuum advance and /or faulty thermostat or temp sensor.
    Regard sPhilip A
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