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    Backfiring/Cutting out VIDEO

    Hai guyz. My M50 was backfiring when I first got it running because the spark plug gaskets were all crusty and worn out so oil was entering the spark plug cylinder and it was arching, so occasionally I was running on 5 or 4 cylinders and it was backfiring decently bad on idle but when I got the car up and going past 1st and 2nd gear it was totally fine. I knew it was backfiring strictly because I can hear the spark plugs arch.

    Yesterday I changed out the gaskets, I tried putting a rag down the spark plug hole to absorb as much oil as I can so it doesn't fall down into the cylinder. Well inenvitably some oil fell down into the cylinder and once finished I started my car and a large billow of smoke came out, expected.

    The car was driving fine for about 200 miles that I drove it today, when all of a sudden in traffic on jersey's US-1 it started backfiring and acting like complete SHIT. I was in 1st gear probably going off 3 to 4 cylinders, it sounded like I was two stepping because it sounded exactly like a two-step system, it sounded AWFUL and the backfires were RIDICULOUS and I was obviously not on all 6 cylinders at all. The more gas I put the more it wanted to die, but when it didn't die it just backfired. Then eventually the car stalled probably 10 times through traffic because it wouldn't really hold idle and when it did I would have to backfire through 1st, 2nd, and 3rd gear until I got it up to highway speeds.
    Eventually I got to my town and it got worse, I was stalling out very easily, wouldn't idle and I couldn't put my foot down or else the car would die or backfire retardedly.

    I'm thinking, could starting the car with the oil in the cylinder have fouled out my spark plugs? The only thing I did yesterday was change out the gaskets, and it's running completely worse! Worst part is that my alpine white rear valance and bumper are burnt up badly from the backfires :(

    video update:
    in this video, im going WOT right from idle, im WOT the entire time until i let the RPM's go back to idle then I go WOT again, im NOT letting off at all. you can hear backfiring in the video.


    halp?
    Last edited by lolcantturn; 12-11-2011, 03:35 PM.
    Originally posted by TSI
    ♫ Rust flecks are falling on my head...♫
    OEM+

    #2
    How do the plugs look now?

    Comment


      #3
      Massive vac leak.

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        #4
        Ive got a similar problem, backfiring. Running on 5 cylidurs. No powar. :(

        Subd for results.
        1985 325e M50TU(Sold)
        1991 318is Slicktop (Sold)
        1990 325is Brilliantrot S50/5 Lug Swapped.
        1992 525i Manual shitbox Winter Beater

        Comment


          #5
          fuel pressure regulator and also test resistance on coils as I told you before.
          Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

          Originally posted by Wh33lhop
          VANOS: sometimes you just need to go full retard.

          Comment


            #6
            Ok so trackjunkie came by and helped me with a few things. Found a nice vacuum leak and also found out that the vacuum line from my FPR to the intake manifold is missing!
            How big of a problem would this cause? It's probably a HUGE deal aint it?
            Originally posted by TSI
            ♫ Rust flecks are falling on my head...♫
            OEM+

            Comment


              #7
              uhh yes, vacuum line from the FPR to the intake manifold missing! thats big

              - How does a fuel pressure regulator work?
              The fuel pressure regulator is able to maintain proper fuel pressure to the vehicle it has been designed for because inside the regulator housing there is a spring pushing against a diaphragm, the spring pressure has been pre-set by the manufacturer for the desired fuel pressure, so the fuel pump has to pump enough fuel and enough pressure at the same time to overcome the spring pressure.
              The extra fuel not needed is sent back to the fuel tank through the fuel return line.
              When the vehicle is at idle, there is less pressure against the fuel coming inside the regulator because the fuel pressure regulator has a vacuum hose attached to it, this way the fuel pressure will be lower ( from 5 to 10 psi depending on the system) due to the fact that the vacuum is forcing the diaphragm inside the regulator housing to have extra pressure against the spring, resulting in a lower fuel pressure when the car is at idle because there is high vacuum inside the intake manifold; when you accelerate and the vacuum drops, the fuel pressure increases to allow the engine to have more fuel as it needs it.

              If that hose is missing, that FPR isnt working right.

              Comment


                #8
                Ok I got an appropriate hose and now my idle seems to be a bit better now that the FPR is connected.

                After solving some more vacuum leaks my idle is just about perfect, though I have one problem.
                When it's idling at its normal RPM and I go WOT immediately, sometimes the car will just die completely. It happens about 1 out of 5 times. then I'll start it back up and it will idle fine.
                note, I don't have an o2 sensor hooked up yet, but I don't think that's the problem.
                Originally posted by TSI
                ♫ Rust flecks are falling on my head...♫
                OEM+

                Comment


                  #9
                  Originally posted by lolcantturn View Post
                  Ok I got an appropriate hose and now my idle seems to be a bit better now that the FPR is connected.

                  After solving some more vacuum leaks my idle is just about perfect, though I have one problem.
                  When it's idling at its normal RPM and I go WOT immediately, sometimes the car will just die completely. It happens about 1 out of 5 times. then I'll start it back up and it will idle fine.
                  note, I don't have an o2 sensor hooked up yet, but I don't think that's the problem.
                  Next time I'm over we'll try and pop a different MAF in, see if that helps.
                  Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                  Originally posted by Wh33lhop
                  VANOS: sometimes you just need to go full retard.

                  Comment


                    #10
                    Originally posted by trackjunkie21 View Post
                    Next time I'm over we'll try and pop a different MAF in, see if that helps.
                    no doubts.
                    Originally posted by TSI
                    ♫ Rust flecks are falling on my head...♫
                    OEM+

                    Comment


                      #11
                      Bamp?
                      Originally posted by TSI
                      ♫ Rust flecks are falling on my head...♫
                      OEM+

                      Comment


                        #12
                        anyone? :(
                        Originally posted by TSI
                        ♫ Rust flecks are falling on my head...♫
                        OEM+

                        Comment


                          #13
                          Originally posted by lolcantturn View Post
                          Ok I got an appropriate hose and now my idle seems to be a bit better now that the FPR is connected.

                          After solving some more vacuum leaks my idle is just about perfect, though I have one problem.
                          When it's idling at its normal RPM and I go WOT immediately, sometimes the car will just die completely. It happens about 1 out of 5 times. then I'll start it back up and it will idle fine.
                          note, I don't have an o2 sensor hooked up yet, but I don't think that's the problem.
                          yes, your engine should run overly rich when u do that as you have no O2 sensor connected and its running on Stooopid mode without it (super rich to prevent risk of lean out). revving at it may just make it die


                          if you unplug the HFM the car will also go on stupid mode. just a different one
                          OBD1 M54/M52TU swap as a M50b25

                          Z4 non powered steering rack fits e30



                          Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                          Comment


                            #14
                            Originally posted by Wanganstyle View Post
                            yes, your engine should run overly rich when u do that as you have no O2 sensor connected and its running on Stooopid mode without it (super rich to prevent risk of lean out). revving at it may just make it die


                            if you unplug the HFM the car will also go on stupid mode. just a different one
                            To a certain extent, I had my o2 sensor unplugged and it never reacted this way.
                            Your signature picture has been removed since it contained the Photobucket "upgrade your account" image.

                            Originally posted by Wh33lhop
                            VANOS: sometimes you just need to go full retard.

                            Comment


                              #15
                              Originally posted by trackjunkie21 View Post
                              To a certain extent, I had my o2 sensor unplugged and it never reacted this way.
                              the stalling out may be due to MORE vacuum leaks on a different engine.

                              BUT, when car is running sans HFM or sans O2 sensor - it is in STUPID mode. Runs rich on purpose.

                              install a wideband AFR O2 meter and test it on your own car and test it if you do not believe me.

                              I actually have a wideband AFR O2 meter installed in my e30 - I care about how it is actually running.
                              Last edited by Wanganstyle; 11-26-2011, 11:47 PM.
                              OBD1 M54/M52TU swap as a M50b25

                              Z4 non powered steering rack fits e30



                              Euro e46 2005/6 320d 6mt gearbox into E30 with M20 hardy and beck 1985 327s engine

                              Comment

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