BX TRI fuel consumption
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  1. #1
    Fellow Frogger! gsmack's Avatar
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    Default BX TRI fuel consumption

    Hi All

    I have 'upgraded' from a TZI to a TRI recently, and am struggling with how much fuel it wants to consume. I didn't expect it to be as good as the TZI, but I seem to get less than 500km to a 66L tank, which is about 25-30% less than I got in the TZI.

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    What does the brain trust think is a reasonable milage to get for the vehicle? (it is country milage)
    and any thoughts about where to start looking for a possible solution, I'm checking spark plugs, air filters etc.
    It is a Bosch Jetronic L3 injector system, do injectors leak internally.

    Any suggestions on how to get injectors out that are really well stuck into the head? Cause i haven't changed the injector filters or seals yet.

    Any thoughts or ideas, greatly appreciated. Petrol price is to high to be running poorly.

    G

  2. #2
    1000+ Posts Ken W's Avatar
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    G,

    A TRI 122 has the same engine as the TZI. A straight TRI has a much detuned DFZ engine, lower compression, lower valve lift and a different shaped combustion chamber. The ECU only controls the fuel delivery and lamda correction. A separate distributor based electronic ignition fires the plugs. So it is possible that the timing may not be set optimally or there may be some problems with the advance curves in the distributor. At least these engines don't develop the appetite for oil that the DKZ engines seem to.

    Unfortunately the DFZ is quite a bit of an efficiency downgrade from a DKZ that is running well.

    Cheers,

    Ken W

  3. #3
    Fellow Frogger! gsmack's Avatar
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    Yes, I did love my DKZ engine, this thing doesn't have a patch on it.
    I have a near new lamba sensor, so I might put it in, just for the hell of it.

  4. #4
    1000+ Posts Greg C's Avatar
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    If you are getting 500km out of a 66l tank you are probably doing about 12l/100km in country running whereas from my experience you should be getting 7.5-8. Therefore something is wrong.

    First thing to check is the lambda sensor so you are on the right track.
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  5. #5
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    I used to get 6-700k from a tank in my old TRI with mixed running. towing a hefty 1200kg I'd get around 500k on the open road.

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    having owned both the TRI (hatch) and the TZI (estate) i got pretty much identical fuel economy from both

    want to look at the injectors and if they are clean
    also what fuel are you using (i found if i put 91 in then it ran bad and used more feul and if i put e10 then it would be even worse (run nothing under 95))
    also how long have you had it now and how much was it be used before you got it
    it may be a case that the previous owner may have not used it much and may need a couple of good runs and need to run it to low tank and fill with good fuel to clear the old fuel out

    if this still hasn't fixed the issues then may be more technical issue

  7. #7
    JBN
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    I never had any idea how many K's I got out of either of my BX TRi automatics. As soon as the ride fell off (at about a half empty tank) I would fill it up to restore the better ride with a full fuel tank. Running mainly in the city, I think I was getting about 11l/100km.

    In the worst case, you could spend a lot of money, get marginally better fuel consumption which in 1 or 2 years might pay for the improvements. I top up every week and try not to think about the cost.

    I work on 300km per 25litre fuel tank on the 2CV. On the one where the fuel guage doesn't work, I fill up at ??250km, ??500km, ??750km, ??000km because it is easy to rememember and I definately won't be running out.

    Fuel is just like demerit points or chips in a casino - expendable. Have fun driving and hang on to your life.

    John

  8. #8
    Fellow Frogger! gsmack's Avatar
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    Well air filter has been changed and put my nearly new lamba sensor in.
    Question, why does the TZI lamba sensor have 4 wires and the TRi only 3? The car still runs, but is it a problem?

    Currently it feels like it has more poke, haven't done a tanks worth of petrol yet.

    JBN, for the number of miles I do, petrol is an important part of the equation, and anyhow fuel injector kits and spark plugs aren't a lot of money

    If someone has an answer about the lamba sensor that would be great!

  9. #9
    Fellow Frogger! gsmack's Avatar
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    Quote Originally Posted by little ufo View Post
    having owned both the TRI (hatch) and the TZI (estate) i got pretty much identical fuel economy from both

    want to look at the injectors and if they are clean
    also what fuel are you using (i found if i put 91 in then it ran bad and used more feul and if i put e10 then it would be even worse (run nothing under 95))
    also how long have you had it now and how much was it be used before you got it
    it may be a case that the previous owner may have not used it much and may need a couple of good runs and need to run it to low tank and fill with good fuel to clear the old fuel out

    if this still hasn't fixed the issues then may be more technical issue
    "recently" is actually 12 months ago. You don't want to rush these things and yes the bottom of the tank is full of crap and crud, should at some stage take it off, tip it upside down and give it a good clean out

  10. #10
    Member twistedeez's Avatar
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    I can't answer any of the technical questions but as for useless info -

    I get just under 800km per tank in a TRI 122. This does require between 500ml and 750ml of oil though. There are no significant leaks so most of it blows out the back. (Perhaps the answer is running your car like a two stroke). The car has got 430 000 kms on the clock so its a small price.
    Generally I use 98 fuel with the occasional 95 if the budget is really tight. It does make a difference (to my car anyway) with the fuel used. It just won't get the same distance on 91. The running is also smoother on 98. Some people have said to me this is bollocks but I have tried 91 several times and there is a noticeable difference.
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  11. #11
    JBN
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    I fully agree that 98 is the only option as far as fuel goes. I use only that by choice for either the Xantia or the 2CVs. For km per litre it takes you further and keeps the engine cleaner and more responsive.

    The oil usage on the TRi 122 can be alleviated by having the valve stem seals replaced. They were never any good from new, but the replacements seem to last longer. I am happy to just top up the oil. Probably the cheapest and certainly the easiest option.

    With BX/Xantia fuel consumption of about 11 litres per 100 kms, I reckon my figures are:

    Average mileage per year - 20,000kms

    That is 200 lots of 100kms

    That becomes about 2200 litres of fuel at 11litres / 100kms.

    At an average of $1.50 (98 RON) that is $3,300.

    Each 1 litre per 100km improvement (or degradation) varies that by $300 per annum.

    The Xantia cost $2000 to buy plus $1000 to renew all the spheres (8 being a VSX) and replace rear arm bearings. Plus initial service (change engine filter/oil, drain automatic, add appropriate Nulon, flush radiator, replace spark plugs with expensive platinum ones, renew air cleaner and aircon filter).

    In round figures the car intially cost one years running costs of fuel and oil.

    I treat a car like this like I treat chips at a casino. Throw them all on the table and when they are gone, walk away.

    John

  12. #12
    CitroŽn, what else? smiffy1071's Avatar
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    Have you tried swapping the fuel pressure regulator? I once had a Citroen ZX 1.9i volcane, which in town, and on ordinary roads, ran like a stuffed pig. However, it ran very smoothly and cleanly once you got it to 170kph!!!

    Turns out that the regulator was stuck wide open, and was forcing far too much fuel in at lower speeds.... kinda like having indigestion.
    The regulator is just a small canister like object, which lives on the end of the rail where the injectors are.
    2005 C5 2.0 VTR Hdi 138, 1986 Kawasaki GPz 750G2

  13. #13
    Fellow Frogger! gsmack's Avatar
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    Well I did some outrageous things like changed my air filter and the O2 sensor and wow it's improved by over 30% I reckon.

    This is the third car that my 'new' air filter has lived in, it lasts better than BXs apparently

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