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

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  • styles
    Noobie
    • Dec 2015
    • 12

    #61
    Originally posted by MTD
    Hey guys, so the car is finally back from the mechanic today. It was currently doing 12.2l/100 (before mechanic). Things that were done:
    -New control arms
    -New bushings
    -New wheel bearing for front left wheel
    -Lambda sensor got cleaned up and fixed, wasn't working properly
    -other sensors all around were "touched up" and overall priming of car

    Things he noticed that will need fixing:
    Somewhat urgent: front right shock, almost gone
    Not so urgent : the catalyzer is getting a bit obstructed, not much right now but still

    Also right now the alignment is fucked up, given the work he did.

    So... Let's hope the fuel consumption drops! Filled a tank today, will report when I have results!
    If your catalytic converter is restricted it will definitely impact your fuel mileage.

    Comment

    • MTD
      Advanced Member
      • Nov 2015
      • 112

      #62
      Originally posted by styles
      If your catalytic converter is restricted it will definitely impact your fuel mileage.
      He said it wasn't much, just that he noticed it.

      BTW, is there a product maybe to clean it or something, or do I have to get a new one?

      Comment

      • styles
        Noobie
        • Dec 2015
        • 12

        #63
        Originally posted by MTD
        He said it wasn't much, just that he noticed it.

        BTW, is there a product maybe to clean it or something, or do I have to get a new one?
        You'll need to replace it.

        Comment

        • MVincken
          Member
          • Sep 2015
          • 75

          #64
          How hard is the law about catalysts in your country?
          For me it isn´t required to have a catalyst, so i just removed it.
          this will free up some horsepower too :)

          offcourse you can replace it. but those things are really expensive

          Comment

          • MTD
            Advanced Member
            • Nov 2015
            • 112

            #65
            Originally posted by MVincken
            How hard is the law about catalysts in your country?
            For me it isn´t required to have a catalyst, so i just removed it.
            this will free up some horsepower too :)

            offcourse you can replace it. but those things are really expensive
            they are somewhat hard. What i could is, like my friend did, take of the cat and put a resonator in its place. It disguises it somehow ahah

            Comment

            • MVincken
              Member
              • Sep 2015
              • 75

              #66
              or cut it open on the top, remove the catalyst mesh and weld it close again.

              but i can´t say if that´s going to affect your engine performance & noise or not

              Comment

              • MTD
                Advanced Member
                • Nov 2015
                • 112

                #67
                Originally posted by MVincken
                or cut it open on the top, remove the catalyst mesh and weld it close again.

                but i can´t say if that´s going to affect your engine performance & noise or not
                Well i talked to my mechanic and did just that, its in the exhaust shop as we speak, should be ready today ;)

                regarding the fuel consumption, more news... My mechanic used the machine that detects errors in the ocb, and discovered that it was accusing an error that wasn't wiped out previously. So he wiped it all. Let's see if it makes any difference

                Comment

                • styles
                  Noobie
                  • Dec 2015
                  • 12

                  #68
                  Any update?

                  Originally posted by MTD
                  Well i talked to my mechanic and did just that, its in the exhaust shop as we speak, should be ready today ;)

                  regarding the fuel consumption, more news... My mechanic used the machine that detects errors in the ocb, and discovered that it was accusing an error that wasn't wiped out previously. So he wiped it all. Let's see if it makes any difference

                  Comment

                  • MTD
                    Advanced Member
                    • Nov 2015
                    • 112

                    #69
                    Haven't done a full tank since he cleaned the errors from my ocb so I still don't know for sure , but he did it when the other one was halfway through and that one got 10,7l/100. Better, but I still would like to get much better out of a m42..

                    Comment

                    • MVincken
                      Member
                      • Sep 2015
                      • 75

                      #70
                      any news?

                      Comment

                      • MTD
                        Advanced Member
                        • Nov 2015
                        • 112

                        #71
                        Yeah sorry, i always forget to come back and report.
                        The fuel comsumption did drop, to 9,8l/100km. Much better, but i still it's too much, for the kind of driving i do (30% city, rest is crusing at 90kph).
                        I did put on some new 16" wheels after that and the fuel rised to 10,2l/100, don't know why...

                        I really don't know what to check for, what do you guys recommend?
                        Furthermore, my next mod is putting a conical air filter, and that should rise the fuel consumption even more right?

                        Comment

                        • roguetoaster
                          R3V OG
                          • Jan 2012
                          • 7747

                          #72
                          Cruising mileage can be impacted by total wheel/tire height. In that respect it's all about revolutions per mile.

                          A cone filter could actually improve mileage in some cases as it often draws warm air in to the intake versus cold air. Thus a less dense air charge means less fuel injected/less total power. It's all dependent on your specific circumstances of course.

                          In any case, there's something seriously wrong with your car or engine when an M42 is getting sub 18 MPG. What fuel are you using again, do you carry a lot of stuff in the car regularly?

                          Comment

                          • sandrune
                            Member
                            • Sep 2014
                            • 87

                            #73
                            Mines doing the same does 260-280 miles on a tank. Only around 20 mpg. A previous owner 4 years ago got around 400 miles on a tank. No clue what's happening.

                            Sent from my HTC6535LVW using Tapatalk
                            '91 318is
                            sigpic

                            Comment

                            • MTD
                              Advanced Member
                              • Nov 2015
                              • 112

                              #74
                              Originally posted by roguetoaster
                              Cruising mileage can be impacted by total wheel/tire height. In that respect it's all about revolutions per mile.

                              A cone filter could actually improve mileage in some cases as it often draws warm air in to the intake versus cold air. Thus a less dense air charge means less fuel injected/less total power. It's all dependent on your specific circumstances of course.

                              In any case, there's something seriously wrong with your car or engine when an M42 is getting sub 18 MPG. What fuel are you using again, do you carry a lot of stuff in the car regularly?
                              I think you did the conversion wrong, maybe u used uk mpg or something. But 10 l/100 is 23.5 american mpg.
                              It still is high anyway. I use 95 octane european gas (don't know exactly what it converts to in "american" octanes, but i think its 91. I don't carry nothing at all in the car, just me and half the time a single passanger. I really can't find whats wrong, plus it's a shame for an engine with just 130000kilometres....


                              Originally posted by sandrune
                              Mines doing the same does 260-280 miles on a tank. Only around 20 mpg. A previous owner 4 years ago got around 400 miles on a tank. No clue what's happening.

                              Sent from my HTC6535LVW using Tapatalk
                              Welp, if you do find the problem let me know....

                              Comment

                              • MVincken
                                Member
                                • Sep 2015
                                • 75

                                #75
                                Originally posted by MTD
                                I think you did the conversion wrong, maybe u used uk mpg or something. But 10 l/100 is 23.5 american mpg.
                                It still is high anyway. I use 95 octane european gas (don't know exactly what it converts to in "american" octanes, but i think its 91. I don't carry nothing at all in the car, just me and half the time a single passanger. I really can't find whats wrong, plus it's a shame for an engine with just 130000kilometres....




                                Welp, if you do find the problem let me know....
                                As far as i know, octane is octane. maybe they have other additives in the US fuel. but in europe you should expect better mileage because of the better fuel.

                                have you done a compression check on your cilinders?

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