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  1. #1
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    Lightbulb need info on engine swap on my malibu

    hi i'm new here and i am intrested in swaping my 3.1 in my 1999 malibu to the 3.4. is the wiring harness exactly the same?
    do i need a new ECU?
    what do i need?
    what would be the best car to get it out of?
    any advice is greatly appreaciated.

    thanx!

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  3. #2
    Moderator car audio dave's Avatar
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    1)first off, why are you doing the swap?
    in 2000 i think, the 3100 had the same output as the 3400. you can swap in the upper intake manifold with no problems, and im sure the heads as well for that matter.
    2) id use the ECU to go with whatever engine is in the car.
    3) a good donor car is a grand am, same platform. what year is your malibu?
    2001 Camaro: LS1 (SOLD)
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  4. #3
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    If your going for power, why not get some port work done or even better a 3500 top end swap?
    Bye bye grand am

  5. #4
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    well my car is a 1999 malibu base model with the 3.1L motor option
    i blew the head gasket so i decided to beef up the motor while i got it apart.
    based upon the reasearch that i've done the 1999 malibu has 155 hp thats not a whole lot i really want more juice.

  6. #5
    Moderator car audio dave's Avatar
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    go to 60degreev6.com and do some research. some guys ahve really built up the motors with new pistons, ported heads, cams, and ported and polished manifolds. you can get around 230-240 hp from that motor n/a if its built right.

    the problem is budget.
    2001 Camaro: LS1 (SOLD)
    2010 Ford Fusion SEL
    2011 Chevy Equinox LTZ (Black Granite, two-tone leather, Nav)
    check out my old ride
    www.fquick.com/ls1dave

  7. #6
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    Quote Originally Posted by car audio dave View Post
    the problem is budget.

  8. #7
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    The 3400 will bolt righ in in place of your 3100.

    Year doesn't really matter, but for simplicity of around the EGR, it would be easiest to start with a '96 to '99 3400, or if you get a newer 3400, use the older (3400) upper intake, this will allow you to retain your EGR, if the new engine does not come with it. If you do get the EGR with teh newer engine it will work just the same as the older on, but may need the connector changed, though there was a new EGR that had the old EGR plug, probably 200 only, or as it seems part of 2000.

    I wouldn't bother with beefing that engine too much, teh tranny is a weak link and would need to be replaced as well. Stock 3400 will be plenty for that tranny and is a good boost in performance over the small port 3100.

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