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Thread: 3.4 engine swap question

  1. #1
    Junior Member
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    Dec 2005
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    2

    3.4 engine swap question

    I am putting a 3.4 DOHC Z34 V6 in my 85 Fiero which currently has a 2.8 V6. How much of the 2.8's current engine wiring harness can I use? Will I need to replace the 2.8's with the 3.4's harness? If so, from which electrical connection point(s)? Will I need the 3.4's ECM as well? I really appreciate all your help here on the forum. Thanks.

  2. #2
    Senior Member FerrariFan's Avatar
    Join Date
    Jul 2003
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    800

    Re: 3.4 engine swap question

    You'll need to use the 3.4 harness and PCM and splice that into the Fiero chassis harness. Get the Fiero and the 3.4 wiring diagrams for your application and lot's of solder and shrink wrap. This swap requires a lot of splicing and soldering. I got my custom PROM from Ryan Gick of Sinister Performance.
    Here's a link to his website with lot's of good info.
    http://dtcc.cz28.com/Customer/3.4DOHCFiero/swap.htm

    Another build thread on Pennocks.
    http://www.fiero.nl/forum/Forum2/HTML/059801.html

    Here's a pic of my 3.4 dohc.
    Attached Images Attached Images    
    Even the longest journey begins with the first step.

  3. #3
    Junior Member
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    Dec 2005
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    Re: 3.4 engine swap question

    Thank you soooooo much! This site is awsome! I really appreciate your knowledge.

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