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    mass airflow sensor?

    Hi!

    Picked up an explorer intake yesterday, guy also threw in a cold air intake.
    ...sorry to interrupt myself here, but there's the intake MANIFOLD, and then there's the intake ..."tube." snorkel. Does it have a more technical name, just that length of rubber and plastic that holds the filter?

    Anyway, this cold air intake included a metal mounting post and and a largish diameter ring with a mass airflow sensor built into it, the kind I'm familiar with from my '01 volvo, and I think which most cars now have.
    Might be the newer format from the '98 explorer, where this was pulled from.

    Does this hook right into our stock system one way or another? Do we have mass airflow sensors at all even, and if so, where are they located?




    Finally, I was thinking about EGR (which I would be disabling if I use this intake).
    I'm curious: does the computer turn the egr on and off? Is the mass airflow sensor before or after the egr inlet? Because if it's well in front of the egr entrance, then doesn't that mean that you'll run rich because the blended exhaust gases have so little oxygen left?
    Or if the computer knows that it's turning on the egr, and I've just sort of left it unhooked, then the computer might try to limit the fuel injectors, thinking there's more exhaust gas (and less oxygen), and I'd run lean?

    #2
    no mass air sensor exists on a stock Vic. The EFI runs on speed-density logic, which is basically derived from engine speed (rpm), air density (air and coolant temperature sensors) and engine load (MAP sensor, reads vacuum) along with input from the throttle position sensor and feedback from the oxygen sensors to make an educated guess at how much air the engine should be using, and using that info to determine how much fuel to give.

    ECM controls the EGR valve to open and close it. EGR valve is in the intake itself, mass air meter would live between the throttle body and the air filter if you had one. The ECM will know if the valve is opened based on feedback from the position sensor. If it calls for the egr valve to open and it doesn't see it actually open, the fuel mix is not affected.
    86 Lincoln Town Car (Galactica).
    5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

    91 Lincoln Mark VII LSC grandpa spec white and cranberry

    1984 Lincoln Continental TurboDiesel - rolls coal

    Originally posted by phayzer5
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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      #3
      Our cars have no MAF (except 90-91 California cars), just leave it in the tube and you can tell people it does, lol. You can do a MAF install with a different ECM if you want, so hang on to it.
      EGR stuff happens past the throttle body, so it has nothing to do with the air tube. You can run fine without the EGR operating, if anything it might wind up a little rich.
      Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
      'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
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      85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereo

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        #4
        why rich?

        And yes-- I've got it, and I'm changing the ECM anyway just for the HO conversion: can I pull the newer explorer computer and make use of my new MAF?
        I just searched the archives for "maf install" and didn't find anything... can you give me some pointers? Or know of a guide/ previous thread that covered it?
        And hey, nothing wrong with an obd-ii upgrade, if it's not too byzantine!

        Comment


          #5
          Originally posted by BerniniCaCO3 View Post
          why rich?

          And yes-- I've got it, and I'm changing the ECM anyway just for the HO conversion: can I pull the newer explorer computer and make use of my new MAF?
          I just searched the archives for "maf install" and didn't find anything... can you give me some pointers? Or know of a guide/ previous thread that covered it?
          And hey, nothing wrong with an obd-ii upgrade, if it's not too byzantine!
          No.
          Unless you come up with a setup similar to Super Lincoln, where you run all explorer accessories, use the harmonic balancer from that engine and whatnot. Then rewire the whole car, and add all of the bullshit that comes along with OBD-II. The computer will be pissed that there's no transmission to control.

          Get a Mustang Mass air computer and a use your explorer mass air meter. Add the wiring for the mass air sensor to your stock harness, and plug in your explorer meter.

          Comment


            #6
            with no EgR, it doesn't so much run rich, as it does not lean out the fuel mix at cruise speed. With EGR, there is less available oxygen, therefore less fuel is needed to ensure that the engine does not detonate. Basically it gives you a smidge of fuel economy while dropping NOx emissions.
            86 Lincoln Town Car (Galactica).
            5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

            91 Lincoln Mark VII LSC grandpa spec white and cranberry

            1984 Lincoln Continental TurboDiesel - rolls coal

            Originally posted by phayzer5
            I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

            Comment


              #7
              which years mustang have a mass air computer, but, aren't yet obd-ii? I know obd-ii is '96+, so I guess the real question is: ??-'95 is the computer I want?
              ...sounds simple, and much simpler than the explorer computer

              Comment


                #8
                89-93 is the most compatible. the A9* series. you ideally want one from an automatic car, and not the F3Z or whatever it is the 93 Cobra came with.
                86 Lincoln Town Car (Galactica).
                5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                91 Lincoln Mark VII LSC grandpa spec white and cranberry

                1984 Lincoln Continental TurboDiesel - rolls coal

                Originally posted by phayzer5
                I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

                Comment


                  #9
                  According to FFI, I'd assume any of these would work good.

                  A9M 5.0 89-93 Mustang MAF / Auto (see note 1)
                  A9P 5.0 89-93 Mustang MAF / Auto (see note 1)
                  C3W 5.0 89-93 Mustang MAF / Auto (see note 1)
                  C3W1 5.0 89-93 Mustang MAF / Auto (see note 1)
                  A9T 5.0 89-93 Mustang MAF / Auto (see note 1)
                  2020 F250 - 7.3 4x4 CCSB STX 3.55's - BAKFlip MX4
                  2005 Grand Marquis GS - Marauder sway bars, Marauder exhaust, KYB's
                  2003 Marauder - Trilogy # 8, JLT, kooks, 2.5" exhaust, 4.10's/31 spline, widened rear's, metco's, addco's, ridetech's 415hp/381tq
                  1987 Colony Park - 03+ frame swap, blown Gen II Coyote, 6R80, ridetechs, stainless works, absolute money pit. WIP

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