Announcement

Collapse
No announcement yet.

Consumption increases after batt disconnect

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • Consumption increases after batt disconnect

    Have you guys and gals noticed that after the batt is disconnected the fuel consumption goes up and it takes maybe a tank full of juice before it comes back to it's previous level ?
    Cheers
    Ross

  • #2
    How do you drive without a battery?
    Greg - 08 D4D Prado,
    Some trips done - Cape York, Fraser Island, Simpson Desert / Central Aust, Vic High Country.

    Comment


    • #3
      Yes ok....when the batt is disconnected then reconnected the fuel consumption increases .

      Comment


      • #4
        Originally posted by Corigator View Post
        How do you drive without a battery?
        Battery is not required to run the car, only to start it. While the alternator is operational, the alternator powers all the services and the battery is charged. Whenever a supply voltage is higher than another supply voltage, the lower voltage becomes a load, hence why a battery charges while driving... If this wasn't the case, the battery would never charge.

        Hence why you can drive without a battery.

        Why you would want to, is another question altogether... How do you start the car again?

        Getting back on topic though, I would have expected consumption to drop as the battery being removed would reduce the load on the engine (as its not connected to be charged).... But then again, charging does not take that long to have thought it would make a noticable difference.
        2014 D4D 150 GXL Automatic - CHARCOAL

        Comment


        • #5
          I think you guys are missing the point... the way I read it is - Battery gets disconnected for what ever reason and then is re-connected for normall operation (ie. Changing the battery)

          After this, the OP is experiencing higher than normal fuel consumption.

          My thought's are that something in the ECU has been reset and it needs to relearn some settings. It may be fuel/air ratio or more likely the driving style of the user but I would expect it to return to normal well before the first tank of fuel has been used.

          VXWesty

          p.s. I wouldn't recommend driving with out a battery either... you've got no protection from spikes / dips in the voltage output by the alternator.
          [SIZE=1]2011 Crystal Pearl VX D4D Auto, MT ATZ 4 Rib, Full River 105AH / Redarc SBi12 DBS (TJM Tray), CKMA12 Air Comp, Alpine INA-W910R - PDX-5 - Type-R Speakers, Engel MT60FP, Rhino Alloy Platform, Foxwing Awning, Rear 12V Cig and Engel Socket, ARB Deluxe Combi Bar, Safari Snorkel, LF 240 XGT's + HID Upgrade, HB3 (9005) HID Upgrade, Bilstein / Lovells 2" Lift Suspension, Chip-It, Alpine PKG-RSE2 Roof DVD Monitors, Maxtrax, GME TX3540 + AE409L, Avenger TDS 9.5, ARB UVP, ARB Protection Steps.
          [/SIZE]

          Comment


          • #6
            +1 on the relearning. The injectors do a re-learning thing every 2000km or so to compensate for injector wear. I noticed my car drives different after a dealer service. The service centre claim that they plug in their tester to check for error codes and re-set the ECU which is why that happens. The drive returns to normal after 300-400km.
            2019 GXL, Bullbar, UHF, Redarc Brake Controller, Tow Bar, Secondary Fuel Filter

            Comment


            • #7
              Originally posted by vk2ss55 View Post
              Have you guys and gals noticed that after the batt is disconnected the fuel consumption goes up and it takes maybe a tank full of juice before it comes back to it's previous level ?
              Cheers
              Ross
              Hi Ross,

              when you refer to fuel consumption do you mean the indicated l/100km on the display, or actual fuel consumption calculated by filling the tank, driving and then filling the tank again. Either way, both have errors (one is a computer having a guess at consumtion and the other is subject to filling the tank to the same level, which is always a challenge in the prado....sometimes the tank seem sfull but there is actually quite a bit left to go), but I know what you are getting at... I guess to get a more accurate idea of true consumtion you need to actually do a few tank fulls, and by then the ECU may have settled down....so the difference you notice just might be within the realm of errors with measurement. As an example, if you are out by just 3 litres with a tank full you will affect the calculated fuel consumption by about 0.2 litres per hundred km. I always notice the indicated fuel consumption on the display takes a while to settle down and read correctly after refuelling, maybe its the same after a service. Anyway, I haven't noticed anything obvious with my girl after a servcie, but it will be having a service soon and will monitor it a bit more closely.
              brogers
              Advanced Member
              Last edited by brogers; 22-11-2012, 08:15 AM.
              SE Qld: GX 150GD Auto, (Feb'16 build): TJM T15 steel b bar, 9,500lb TORQ winch, TJM s steps, Rhino Pioneer Platform (42102B 1928X1236mm), front recovery points, Wynnum towbar, P3 brake controller, TNN Underbody guards, UHF, TREKtable & LED striplight, Custom Fridge & Drawers, Waeco CFX50, 9inch illuminator 160W LED spots, 40mm lifted Dobinson Suspension (Zordo's), ScanguageII, 30 Sec Wing Awning

              Comment


              • #8
                I'm sorry if I wasn't specific enough about the batt disconnect/reconnect thing but why would I drive without a battery ? DO NOT do this as the alternator voltage will go through the roof and blow up all sorts of things when there's no batt present .
                It must be the re learning of the ECU after a reset but on mine it makes quite a difference going by the trip computer . Normal running about it's in the 11 range but after a reset it's up to high 12s . I wonder why it starts high then pulls it down ? What's the lowest you've seen , mine's been down to 8 running on flat country .
                Did you see the fuel consumption comparo in the latest 4WD A

                Comment


                • #9
                  I'm sorry if I wasn't specific enough about the batt disconnect/reconnect thing but why would I drive without a battery ? DO NOT do this as the alternator voltage will go through the roof and blow up all sorts of things when there's no batt present .
                  It must be the re learning of the ECU after a reset but on mine it makes quite a difference going by the trip computer . Normal running about it's in the 11 range but after a reset it's up to high 12s . I wonder why it starts high then pulls it down ? What's the lowest you've seen , mine's been down to 8 running on flat country .
                  Did you see the fuel consumption comparo in the latest 4WD A

                  Comment


                  • #10
                    I couldn't even drive one kilometre in my Cobra after leaving it garaged for about 4 months and finding the battery flat. I removed and had the battery charged and tested. Re-installed the battery, fired up the 347 efi only to have it blow heaps of black smoke. Wouldn't run below 2000rpm. Tried to drive it around the block but it stalled every time I came to a stop and it backfired and popped so much I thought stuff it, I'll park it up until I can find 5 minutes to have a look at the problem. It's only done 160km since I re-installed the new engine in November last year. According to my Bosch fuel injection manual, the computer will only take a couple of kilometres of driving, including braking, stopping and accelerating to "re-learn" and operate properly.
                    Dave
                    Views expressed are mine alone and are not intended to compromise the integrity of my employer nor offend those who may read such views.
                    Bugger Bali, get out and see Australia before we sell it all to China.

                    Comment


                    • #11
                      I found the culprit. Extended memory chip was grounding on the ECU body cover resulting in no self-learning ability. Trimmed the aluminium cover, fired up the beast and it instantly idled correctly. I went for a drive and I reckon it had completely reset all parameters in a couple of kilometres. I'd almost forgotten how hard that 347 goes.
                      Dave
                      Views expressed are mine alone and are not intended to compromise the integrity of my employer nor offend those who may read such views.
                      Bugger Bali, get out and see Australia before we sell it all to China.

                      Comment


                      • #12
                        Hey Matty&Loz.....mate...DO NOT RUN THE MOTOR WITHOUT A BATTERY . The alternator voltage goes sky high with no batt present and will blow up all sorts of 12V stuff .
                        You could get away with it in the old days running generators but not now .
                        Cheers
                        Ross

                        Comment

                        canli bahis siteleri bahis siteleri ecebet.net
                        mencisport.com
                        antalya escort
                        tsyd.org deneme bonusu veren siteler
                        deneme bonusu veren siteler
                        gaziantep escort
                        gaziantep escort
                        asyabahis maltcasino olabahis olabahis
                        erotik film izle Rus escort gaziantep rus escort
                        atasehir escort tuzla escort
                        sikis sex hatti
                        en iyi casino siteleri
                        deneme bonusu veren siteler
                        casibom
                        deneme bonusu veren siteler
                        deneme bonusu veren siteler
                        betticket istanbulbahis
                        Working...
                        X