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3.1L into 2m4 fiero..let me have it

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  • #1

    3.1L into 2m4 fiero..let me have it

    I just picked up a 1984 Fiero 2m4 4speed -m.
    I found a 3.1L with 30,000 in it
    comes with the harness & ecu
    Now I understand that there are 3.4 4.3 350 383 3.8 and 3.8sc swaps that can be done.
    But I have a set amount of cash and the 3.1 would make me happy enough.

    My question is..does the 3.1-2.8 block mount right up to the stock 4 speed manual trans I have in the car?

    And any other info on this swap would be a huge help.
    thanks
    Tags: 3.1 swap, fiero motor swap
  • #2
    Yes the trans bolt pattern is identical. You can use everything from the 2.8L on the 3.1L
    1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
    1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
    Because... I am, CANADIAN

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    • #3
      You'll have to modify the cradle to put a v6 in place of the iron duke because of different engine mount arrangements. Lots of threads on PFF discuss the swap.

      http://www.fiero.nl/cgi-bin/fiero/Ultimate.cgi?action=intro


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      • #4
        I was told that the motor mounts are the same due to the fact that the 2.8 was an option. no?
        and as for that other forum ..Its great but I couldnt find a 3.1 swap on there.
        So any help you guys can give me is awesome.
        So other than motor harness and ecu what will I need?

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        • #5
          Here's a thread on swapping in a 2.8 for a 2.5. A 3.1 isn't too different from a 2.8 swap unless you want to switch over to a DIS ignition...
          http://www.fiero.nl/forum/Forum2/HTML/096895.html


          V6 wiring harness is different from the 2.5. Did you get the wiring harness and engine computer with the 3.1?

          Edit - duh reread your first post, you have the harness and ECM

          Last edited by TiredGXP; 02-22-2009, 09:13 PM.

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          • #6
            So this shouldnt be that hard at all.
            now will the front harness of the 2.5 plug into a 3.1L ecm?
            Oh and tiredGXP great link thank you.
            Also what about the fuel pump?
            Last edited by dCaHnAnOyS; 02-22-2009, 09:50 PM.

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            • #7
              Iron Duke fuel pump runs at a way lower pressure. You'll need at least a 2.8 MFI pump.
              Kaiser George IX: 1996 Buick Century Special wagon. 213-SFI. 250k miles. Never gonna give you up, never gonna let you down. First documented LX9 swap in an A-body! Click here to read my build thread!

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              • #8
                OK..that i can take care of.
                now is there anything elce I should know? I just want to make sure I have everything when I get started.

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                • #9
                  You can probably save yourself a lot of headaches by grabbing a 2.8 cradle. Don't forget the exhaust on a Fiero can be a nightmare to fabricate.

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