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2002 Ford ZX2(again) Short Term Fuel Trim and Long Term Fuel Trim trying to find a vacuum leak

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  • #459290
    rice400rice400
    Participant

      STFT is good but your

    Viewing 15 replies - 16 through 30 (of 36 total)
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    • #459305
      college mancollege man
      Moderator

        You either have a vacuum leak or not enough fuel. try searching for vacuum_x000D_
        leaks. use a spray bottle of water instead of carb spray. use the procedure in

        #459306
        dreamer2355dreamer2355
        Participant

          Do you have access to the freeze frame data so we can see if its a lean condition under a load or not?

          #459308
          MattMatt
          Participant

            [quote]Quoted From nsman06: _x000D_
            _x000D_
            Okay so today I was unable to get alot

            #459309
            college mancollege man
            Moderator

              [quote]Quoted From nsman06:_x000D_
              _x000D_
              Okay so today I was unable to get alot

              #459310
              EricTheCarGuy 1EricTheCarGuy
              Keymaster

                +1 on using water if you’re not comfortable with the carb cleaner method, as stated it will fill the void created by the leak and the idle should smooth out, carb cleaner and propane are also effective in that they provide a richer mixture in addition to

                #459311
                nsman06nsman06
                Participant

                  Okay so heres the update. I took it to my mechanic and there is nothing wrong with the car. It idles smoothly, no vacuum leaks, no pinched wires from the transmission job, no pinched vacuum lines, and the O2 sensors are normal. So with all that said I sti

                  #459312
                  college mancollege man
                  Moderator

                    Have your mechanic read live data. look at the fuel trims._x000D_
                    read them at idle. Then bring the rpm to 2000 see if the_x000D_
                    fuel trims come down. then do the same at 3000 rpm._x000D_
                    if the fuel trim numbers come down drastically then its

                    #459313
                    nsman06nsman06
                    Participant

                      The MAF

                      #459314
                      nsman06nsman06
                      Participant

                        Oh and also the LTFT was high at 19.5 and the stft ranged from 5.5-10.2

                        #459315
                        Third GearThird Gear
                        Participant

                          Those LTFTs are too high for my liking to be considered “normal”. I was chasing an issue I had with my 99 Sierra for awhile, I thought the trims were too high (but no codes) and I couldn’t find a vacuum leak. I discovered my fuel pressure was 10

                          #459316
                          MikeMike
                          Participant

                            Ot exhaust leak before the o2 sensor

                            #459317
                            rice400rice400
                            Participant

                              I agree, check your fuel pressure

                              #459318
                              ScannerDannerScannerDanner
                              Participant

                                I believe on this engine there is a pcv elbow (that splits) that is underneath the intake manifold that you cannot see unless your underneath the car._x000D_
                                also I had 1 of these engines completely kick my ass with this condition and it ended up being the tim

                                #459319
                                ScannerDannerScannerDanner
                                Participant
                                  #459320
                                  EricTheCarGuy 1EricTheCarGuy
                                  Keymaster

                                    [quote]Quoted From ScannerDanner: _x000D_
                                    _x000D_
                                    I believe on this engine there is a pcv elbow (that splits) that is underneath the intake manifold that you cannot see unless your underneath the car._x000D_
                                    also I had 1 of these engines completely kick my ass with

                                  Viewing 15 replies - 16 through 30 (of 36 total)
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