My 18is is consuming way to much fuel...

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  • bmwman91
    No R3VLimiter
    • Oct 2004
    • 3128

    #16
    Makes sense, good call on testing at the DME. If the temp sensor is anything like the sender, the wires by the connector might be prone to breaking.

    Transaction Feedback: LINK

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    • MVincken
      Member
      • Sep 2015
      • 75

      #17
      but when the coolant sensor is broken, won´t the coolant gauge also give a bad value?

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      • 5Toes
        Banned
        • May 2010
        • 9836

        #18
        ^ no. there are two separate senders. one for the DME and one for the gauge.

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        • MTD
          Advanced Member
          • Nov 2015
          • 112

          #19
          So the car is back from the mechanic. The temp sensor was gone, so he put in a new one. Let's hope that was the problem! Filled a tank today, i'm gonna report in a week or so when i fill again and get the mpg calculation!

          Also, thanks for all the tips guys!

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          • 916e30Dave
            Noobie
            • Sep 2015
            • 27

            #20
            I'm interested to hear your results

            Sent from my SM-N910T using Tapatalk

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            • word is bond
              E30 Addict
              • Apr 2012
              • 503

              #21
              Hey - any follow up on this? I've had a similar issue for while. Replaced the O2 sensor, but no difference...
              diamantschwarz 1991 318is

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              • MTD
                Advanced Member
                • Nov 2015
                • 112

                #22
                Hey, sorry i forgot to mention the results.
                So, last saturday i filled up again... and the results where disappointing. 22.5mpg. 1mpg of improvement, but that's probably cause i did a trip with 70kms of continuous freeway.

                This problem is really annoying, and is driving me to bankruptcy. Filling the thank every 7 days, with the gas prices here in europe is insane.

                Other suggestions as to what might the problem be?

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                • MVincken
                  Member
                  • Sep 2015
                  • 75

                  #23
                  Strange, try to put on an emission tester, maybe the lambda sensor has gone bad.
                  No engine fault codes?

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                  • MTD
                    Advanced Member
                    • Nov 2015
                    • 112

                    #24
                    Originally posted by MVincken
                    Strange, try to put on an emission tester, maybe the lambda sensor has gone bad.
                    No engine fault codes?
                    Emissions should be ok, it was tested the other day when i took the car to get inspected and certified to drive another year, at the inspection center

                    no fault codes

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                    • MVincken
                      Member
                      • Sep 2015
                      • 75

                      #25
                      hmm, yes i was more talking about percentage of oxigen in the exhaust gasses.

                      how is the rest of the hardware of the car?
                      try to jack it up and check if all the wheels run free
                      when is the last time you changed your motor/gearbox/diff oil?

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                      • MTD
                        Advanced Member
                        • Nov 2015
                        • 112

                        #26
                        Hardware is ok. All wheels are ok.
                        Oils have been changed about 1/2 months ago, almost after i bought the car

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                        • d_elson0
                          Wrencher
                          • Feb 2011
                          • 242

                          #27
                          Alignment/toe/caster? Tire pressure. What wheels you have? Wheel bearings. Knock out the simple things first like prior posts mentioned. 21mpg still ain't too bad, but can be better

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                          • MTD
                            Advanced Member
                            • Nov 2015
                            • 112

                            #28
                            14" standard bbs wheels. They were aligned on a wheel house on the machine a week ago, they are alright. What does toe and caster mean?

                            i was really hoping to get better than 21mpg... Fuel efficiency was the main reason i chose the m42 over the other engines

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                            • bmwman91
                              No R3VLimiter
                              • Oct 2004
                              • 3128

                              #29
                              21MPG is poop for these engines. Back in 2008-2009, I would get 32MPG when I was commuting and actually trying to get good mileage. That is 32MPG calculated by dividing the trip odometer by gallons at the fuel pump, so actual 32MPG.

                              For whatever reason, if I look at my mileage since about 2010, it just decreases linearly and nothing that I ever replaced or fixed ever really helped. I still have not put my new coolant temp sensor in, but it sounds like it might not be the issue. Readings from my wide-band O2 sensor seem to indicate that things are running properly at stoichiometric.

                              So, maybe it is in fact a dying diff or bad wheel bearings. Sadly, those are sort of expensive and involved to replace. I will be replacing all of those items in a month or two as part of my prep for autoX in 2016 (scored a Quaife 4.10 LSD on here a little while back!)...I will report back if it help anything in my case. The small case 4.10 LSD I have in there now makes a lot of noise.

                              Transaction Feedback: LINK

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                              • MTD
                                Advanced Member
                                • Nov 2015
                                • 112

                                #30
                                Originally posted by bmwman91
                                I would get 32MPG
                                oh yessssssssss

                                please also report if you could fix the problem. I also intend to get new wheels maybe in the beginning of next year, but the diff was something i only was going to change more down the line. Hope that's not it..

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