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Thread: 3.9 V8 FUEL ISSUES

  1. 18th March 2012, 08:58 AM #1
    yajreklaw
    yajreklaw is offline Fossicker
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    Question 3.9 V8 FUEL ISSUES

    Hey guys.

    just looking for some advice on where to find all the sensor that are recomended for cleaning to try and rectify my drop in fuel economy (a bit of a description would help out), i've pull a few bits out and hit them with contact cleaner.

    next question i recently changed out my stock exhaust and manifolds to a set of gennie extractors and stock rear pipe, so i noticed no cat convertors and no exhaust gas sensors should there be some and would these effect my running rich. there is a crap load of black soot on the tail pipe,

    Any advice would be helpful, i would just love to get back to about 7ltrs per 100 rather then the 4 to 5 im getting currently.

    thanks
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  2. 18th March 2012, 09:08 AM #2
    Young Angus's Avatar
    Young Angus
    Young Angus is offline Master
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    Hmmm I for one would sure love to get 4 to 5 litres per 100km, in ANY car, but that's just me

    (sorry I'm actually no help here but I'm sure others will be)
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  3. 18th March 2012, 09:13 AM #3
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    blackbuttdisco
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    You are doing extremely well to get 7l/100km. most of us get 15 plus. TDi's, appear to get 10 to12, or do you mean 7 litres per klm? A bit more info may be needed. Look on this forum and I mean, look, it can take ages as you get distracted.
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  4. 18th March 2012, 09:25 AM #4
    Blknight.aus's Avatar
    Blknight.aus
    Blknight.aus is offline RoverLord Vendor
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    I hope he means 7k/l and hes dropped to 4-5k/l.
    Dave

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  5. 18th March 2012, 01:12 PM #5
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    BigJon
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    Quote Originally Posted by yajreklaw View Post

    i noticed no cat convertors and no exhaust gas sensors
    Catalytic convertors and oxygen sensors were not fitted to Australian spec D1s.
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  6. 18th March 2012, 01:20 PM #6
    yajreklaw
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    Quote Originally Posted by Blknight.aus View Post
    I hope he means 7k/l and hes dropped to 4-5k/l.
    Yeah my bad i did mean 7k/l to 4k/l, what should i look at and what should my next move be under the bonet....
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  7. 18th March 2012, 02:03 PM #7
    PhilipA
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    There are 2 major sensors that affect fuel economy.
    1 The engine temp sensor to the ECU. This cannot be "cleaned" but can be replaced. at operating temp the resistance across the terminals should be around 300 Ohms.
    2 the MAF. This can be cleaned with electronics cleaner sprayed into the small hole visible on the LH , looking through the wire screen.

    Other common reasons for poor economy are a broken vacuum advance diaphragm and or the centrifugal advance stuck at retard.

    Regards Philip A
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  8. 19th March 2012, 08:51 AM #8
    chazza
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    Check out the following links; all you wanted to know about 14CUX and how it works,

    cheers Charlie

    14cux ECU, Ignition ecu's and useful off forum links

    Standard ECU 1

    Standard ECU 2

    Rover 14CUX Hot Wire Mass Flow EFI: Service and Troubleshooting


    Standard ECU
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