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Injectors and MAF's (1st Gen.) School me!

Discussion in 'Under the Hood' started by Nedwreck, July 9, 2011.

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    1. Nedwreck

      Nedwreck Active Member

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      Year, Model & Trim Level:
      '93 xlt, '92 4x4
      I'm stuffing a '91 engine in a '93, and the injectors are different color.
      (newer engine injectors are black, the blown up engine has red)

      I recall a couple years ago, when I put a '95 engine in a '92, I had to change the injectors to get the thing running right (same situation, but reversed - the 92 ran with the black ones fine).

      My Mustang buddy tells me it's a matter of selecting the correct MAF for the injector size. I have old MAF's laying around, for a '92 and a '95.

      I did a few searches, but I don't seem to have a knack for picking the right search terms.

      Somebody school me, please?
       
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    3. Nedwreck

      Nedwreck Active Member

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      Year, Model & Trim Level:
      '93 xlt, '92 4x4
      Just adding notes as I find stuff...

      I see that the parts houses list a different Inj. for 91-92 and 93-94, but the MAF sensor is the same. Why they do dat?

      Some sites (like this one) don't list a "compatible" 91-92 injector.

      What injectors are what rating? Anybody?

      Advance auto part numbers:

      93-94 Explorer
      Beck/Arnley Injector Part No. 158-0458 62.99
      BWD Injector Part No. 57081 39.99

      91-92 Explorer
      Beck/Arnley Injector Part No. 155-0264 64.99
      BWD Injector Part No. 57077 64.99

      MAF sensors
      Beck/Arnley MAF Part No. 157-0265 101.19
      BWD MAF Part No. 29081 56.69
       
    4. Turdle

      Turdle Freelance Stuntman Staff Member Moderator Elite Explorer

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      some 93 and all 94 have what is called "sequential fire" injection, while earlier have "batch fire" injection. This may be the hidden info needed to figure this out?

      Sequential fire injection uses a separate "channel" to each injector. ( kinda like a surround sound amplifier with 6 dedicated outputs-)

      Batch fire has only 2 "channels", one for each bank. Each is then divided into 3 parallel circuits to power the injectors. ( like 3 speakers hooked in parallel to each side of a 2 channel stereo)

      In the batch fire system each injector get 3 pulses to fire during one complete engine cycle--I am still trying to wrap my head around how this works-but it does
       
    5. Nedwreck

      Nedwreck Active Member

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      Good info Turdle. Ill look into that more.

      A local mustang guy tells me the black injectors are 23#, and the reds are 30#. He also mentioned possible differences in EEC pulse width and fuel pressures.

      The short version is, make sure you have the correct maf and injector vs. original - which is what I didn't want to hear - being my old injectors are suspect plus the time to do the switch.

      Woulda been great to use a different MAF and call it good.
      Time will tell however... that and the CEL. Heh
       
    6. Nedwreck

      Nedwreck Active Member

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      To get this Explorer out of the shop, I just tossed it together figuring an Injector change in a few days ain't no biggie.

      I had no CEL however, and the thing seems to run very very well (so far as the 4.0 goes anyway).
      .

      How long does it take for the EEC to go closed loop after startup anyway? I only ran it a few times, about 5 minutes each.

      Test drive is pending, I'm going to freshen up (check) the brakes/steering/diff. fluids/etc.. before driving it.
       
    7. Nedwreck

      Nedwreck Active Member

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      Year, Model & Trim Level:
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      Just an update...

      My spare Explorer is running ('93), and I never did change the injectors to red ones. The black ones seem to be ok, but I never drive it really. It does have an intermittent cylinder at idle, which plugs/wires/etc didn't fix.

      It seems that I need a set of injectors anyway.

      Does anyone have a suggestion on where to find these reasonably priced? or a vendor that cleans and tests them?

      :)
       

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