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    Heavy exhaust "soot" build up on bumper

    Recently I have noticed a build up of exhaust "soot" on my bumber from the muffler. I've never noticed this problem before. What could be causing this?
    2013 Dodge Dart Aero

    #2
    when i had "soot" build up it was from running too rich, which was traced to a bad sensor
    When you turn your car on... does it return the favor?

    Originally posted by goldstar
    Yes, still have it. It was my attempt to immortalize you in verse.

    A Protege driver named Brock
    Once said 7 seconds he'd clock.
    So his engine he goosed
    With much too much boost,
    And drove a rod through his block.

    Comment


      #3
      Probably from when I installed the RX7 VAF, guess I need to re-tune it.
      2013 Dodge Dart Aero

      Comment


        #4
        what sensor did you change protoss??
        No more protege, Mx-3 now...Only known BP powered Mx-3 in Nova Scotia

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          #5
          Have you been performing a lot of WOT driving recently? If so, this could be a potential cause. During a series of ~15+ run auto-x events, I get an obvious carbon build up on the rear bumper of my Miata. As far as I'm concerned, it's rather normal considering Mazdas run rather rich at the top of the power band. Note, however, as others have mentioned, it could be due to a faulty O2 sensor.
          -Kevin
          -90 Miata 1- #80 CSP, '01 1.8L Swap w/ working VVT
          -90 Miata 2 - $2005/6/7 Turbocharged GRM Challenger
          -91 Tracer - $2008/9 AWD Converted Turbocharged Challenger
          -94 MX3 - #8 Hong Norrth LeMons/Chumpcar Racer
          -02.5 Protege5 - The Daily

          Comment


            #6
            i think i am running a little rich too...

            Would the O2 sensor cause a high idle as well?
            -=Jesse Goertzen=-

            92 Protege SE | 1.8 DOHC SWAP w/SOHC Tranny | White

            Alpine, Kicker, Boston, Infinity, Panisonic, Lightning Audio | Tokico, Eibach, Vibrant | Ractive

            "I make your car go 'Kiki Boom Boom' fast, OK?!?"

            Comment


              #7
              Jesse, just lower your idle. If you still haven't found the adjustment screw, I can show you where it is.
              My ClubProtege.com Feedback Thread


              MOSI Race Dynamics
              - Aftermarket Parts Sales & Services MOSI Race Dynamics Feedback Thread

              Comment


                #8
                Originally posted by jgoertzen
                i think i am running a little rich too...

                Would the O2 sensor cause a high idle as well?
                rich mixture, high idle. sounds like a bad ECT sensor. that is what i replaced.
                When you turn your car on... does it return the favor?

                Originally posted by goldstar
                Yes, still have it. It was my attempt to immortalize you in verse.

                A Protege driver named Brock
                Once said 7 seconds he'd clock.
                So his engine he goosed
                With much too much boost,
                And drove a rod through his block.

                Comment


                  #9
                  Re: Heavy exhaust "soot" build up on bumper

                  Originally posted by Marc93lx
                  Recently I have noticed a build up of exhaust "soot" on my bumber from the muffler. I've never noticed this problem before. What could be causing this?
                  Sounds like you're running too rich. Most likely a bad sensor.
                  ~Mar.

                  Now say it with me... B-R-A-K-E.

                  Good job!

                  Comment


                    #10
                    I know where the idle adjust screw is...

                    It wouldn't lower it more than 100rpm... it's something else... i guess when i get some money i will have to replace/check my sensors
                    -=Jesse Goertzen=-

                    92 Protege SE | 1.8 DOHC SWAP w/SOHC Tranny | White

                    Alpine, Kicker, Boston, Infinity, Panisonic, Lightning Audio | Tokico, Eibach, Vibrant | Ractive

                    "I make your car go 'Kiki Boom Boom' fast, OK?!?"

                    Comment


                      #11
                      Used to happen to me when I had the 1.5 .... the whole back of the car would be blackened up ... oh well , just would wash the car and wash it off.....

                      after motor-swap I no longer see this.
                      photo album|photo album 2 (pbase)

                      dbest1a AT yahoo DOT com

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                        #12
                        I've always had this problem, even when I had my LX motor. Now that I've got the GTR, it's horrible. I should paint the car primer black so no one will notice. Then again I'm always driving the car hard and shifting like this --->:ARCADE: .

                        Adam
                        1991 Protege GTR
                        #1739 of 2500

                        Disclaimer: The "Protege GTR" is a custom car. Mazda never made this vehicle.
                        1991 Mazda 323 GTR Sedan
                        MODS:
                        GTR motor swap, F&R Familia strut bars, MX-3 Rear Lower strut tie bar, GTX front bumper, GTX grill, EDM headlights & corners, EDM 323 rear garnish, EDM spoiler, EGT sideskirts, MX-3 seats, GTX steering wheel, EGT glass sunroof, WRX hood scoop (functional!!), and other things that take too much space to list.....
                        TO DO LIST:
                        EDM/JDM rear bumper
                        EDM/JDM power folding mirrors
                        Repaint car

                        Comment


                          #13
                          I turned the weheel inside the VAF back a couple of clicks to lean the mix out a bit. Problem seems to be fixed. I washed the car and its been around a week and I don't have any build up at all.
                          2013 Dodge Dart Aero

                          Comment


                            #14
                            Are you buying gas from hole-in-the wall stations? No-name stations?

                            try some better gas.. i.e. Mobil , Sunoco

                            what do your spark plug tips look like?
                            NOW WITH SPINNER HUB CAPS

                            Comment


                              #15
                              Originally posted by Ambassador
                              Are you buying gas from hole-in-the wall stations? No-name stations?

                              try some better gas.. i.e. Mobil , Sunoco

                              what do your spark plug tips look like?
                              I usually buy gas at Philips 66. I will have to look at my spark plugs.
                              2013 Dodge Dart Aero

                              Comment

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