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    lag at WOT

    driving down the highway in 5th gear tonight, and I noticed when I went to pass someone and pushed it, there was almost a hesitation, kinda stuttered for a bit...only at WOT tho, it would still accelerate if I let off even just a tad

    was thinking maybe the fuel pump on its last legs?
    1991 318is --- currently not road worthy
    1991 318i ---- 308K - retired

    Originally posted by RickSloan
    so if you didnt get it like that did you glue fuzzy oil to the entire thing?

    #2
    A weak pump, flaky FPR, or clogged injectors are possibilities. But also check the WOT switch in the TPS. If it is bad the engine will be down on power at high rpm.
    The car makes it possible, but the driver makes it happen.
    Jim Levie, Huntsville, AL

    Comment


      #3
      new development....it happens in all gears, when I push it to get onto a highway and/or passing people, and sometimes its not even at WOT, just during 'spirited' acceleration and the check engine light pops on, but as soon as I lift my foot off the gas it goes out...definitely a huge loss of power and while the check engine light is on the car would barely accelerate if at all, kinda just stayed constant or even slowed down a little going uphill.

      Thinking maybe one of the sensors or TPS? I dont think the fuel pump would cause the CEL to come on, no?
      1991 318is --- currently not road worthy
      1991 318i ---- 308K - retired

      Originally posted by RickSloan
      so if you didnt get it like that did you glue fuzzy oil to the entire thing?

      Comment


        #4
        I'm on an aftermarket MAF system, and I have felt the same as OP. I've had this issue for quite some time (maybe a year or 2) but can't pin it down, though I have not checked my injectors lately., I'm willing to bet that it will be the actual MAF or in the OP's case AFM.
        I've replaced the TPS, FPR, plugs, cap & rotor and still the same results.
        @IRON-E30 aka Edwin:D

        Comment


          #5
          I'm gonna clean out my AFM and take some resistance readings on my crank and cam sensors and see what happens (that is assuming I can make it home tonight)
          1991 318is --- currently not road worthy
          1991 318i ---- 308K - retired

          Originally posted by RickSloan
          so if you didnt get it like that did you glue fuzzy oil to the entire thing?

          Comment


            #6
            it seems like I have code 1234 popping up, which would make sense b/c my speedometer doesnt work right now (wires are cut) but that shouldnt cause these problems right?
            1991 318is --- currently not road worthy
            1991 318i ---- 308K - retired

            Originally posted by RickSloan
            so if you didnt get it like that did you glue fuzzy oil to the entire thing?

            Comment


              #7
              I'm not sure what DME does with the speed signal on this car. I'd say to fix the speed signal problem and see what affect, if any, it has.
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

              Comment


                #8
                it hasnt been connected for over a month, dunno why it would suddenly create a problem now. I'm still gonna check the resistance of the sensors and use my sisters TPS to see if that helps.

                Thanks tho! hopefully I can make it home tonight without AAA
                1991 318is --- currently not road worthy
                1991 318i ---- 308K - retired

                Originally posted by RickSloan
                so if you didnt get it like that did you glue fuzzy oil to the entire thing?

                Comment


                  #9
                  I've had similar sounding stuff happen when the alternator was going bad..

                  but then you would notice other electronics go off .. it might not get enough air .
                  Last edited by Xat1cZ; 03-09-2012, 07:15 AM.
                  ლ(ಠ益ಠლ)Be Afraid Of The Future

                  Comment


                    #10
                    have to rescind my previous statement.....popped in a known working TPS, still have the same issue, although the check engine light didnt go on this time, will know more on my way to work tomorrow
                    Last edited by jrobie79; 03-07-2012, 07:32 PM.
                    1991 318is --- currently not road worthy
                    1991 318i ---- 308K - retired

                    Originally posted by RickSloan
                    so if you didnt get it like that did you glue fuzzy oil to the entire thing?

                    Comment


                      #11
                      so its getting a bit worse, I still drove an hour to work today, and everything seems fine for the first 20-25 minutes of my trip...it does seem to not have as much top end power when I am trying to really accelerate, but there is no stumbling or hesitation.

                      fast forward to about 25 minutes into my trip and the problem comes back, so bad that I had to pull over on the highway and get all frustrated, so I shut the car off, and start it bcak up and it seems the problem is gone again (at least to the extent previously explained)

                      I unplugged the o2 sensor as someone suggested this was the problem...no dice, I changed the TPS to a known working one....same problems.

                      I'm going to check the resistance of the sensors when I get back to my parents house this weekend, crank, cam, coolant temp, etc...

                      does this help at all with a possible diagnosis?
                      1991 318is --- currently not road worthy
                      1991 318i ---- 308K - retired

                      Originally posted by RickSloan
                      so if you didnt get it like that did you glue fuzzy oil to the entire thing?

                      Comment


                        #12
                        Have you had a computer hooked up to it for a diagnosis? does it seem like it could be that the alternator doesn't charge properly
                        ლ(ಠ益ಠლ)Be Afraid Of The Future

                        Comment


                          #13
                          No I havent, where/what kind of computer would be used for this?
                          1991 318is --- currently not road worthy
                          1991 318i ---- 308K - retired

                          Originally posted by RickSloan
                          so if you didnt get it like that did you glue fuzzy oil to the entire thing?

                          Comment


                            #14
                            I use Carsoft, it's a program that reads the ECU and can be used on a "normal" computer .. you just need correct plugs to be able to plug it into the connector in your engine bay ...

                            any BMW dealer could (should) do it for you tho'


                            that:
                            http://www.carsoftinternational.com/...oft_bmwv73.htm
                            ლ(ಠ益ಠლ)Be Afraid Of The Future

                            Comment

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