engine swap

3.1POWER · 10-18-2008, 09:20 PM

So my friends 3.1 motor in his 200? malibu siezed up. i have a spare older 3.1 motor from a 91 olds. Can i just swap the intake, valve covers and all the bolt on stuff and drop in that motor or are they too different?

Alxsmt · 10-19-2008, 02:46 AM

i would imagine you could. i would swap the heads too. that may be the only way to get the intake plenums on

PCGUY112887 · 10-19-2008, 05:24 AM

When you say 200?, do you mean it's 2000+ 3.1 in a malibu? If so, then no, stuff from a 3.1 91 olds will not work. They are totally different generation engines, the 91 is called the 3.1 but after 94 they became 3100 motors, much different heads/intakes/etc.

Just get a 3100 from the junkyard and swap it in, their a dime a dozen. Or even a 3400 if he wants some more powah for a bit of extra work.

Alxsmt · 10-19-2008, 12:41 PM

i always thought you could swap out the 3.1 heads for some 3100 heads and if you do that the intakes would fit.. weird

1988GTU · 10-19-2008, 12:44 PM

The 3.1 cannot be controlled by obd2 due to the SFI. You must stay 3100 or <.

Superdave · 10-19-2008, 01:18 PM

It'll work but throw multiple trouble codes, lack of a cam position sensor and a 24x crank sensor would be the big ones.

bad idea, just grab another 3100 for it.

RedBird · 10-21-2008, 01:19 PM

all this aside from that fact that it's illegal to put an older motor into a newer car. :P i mean if the design is the same it's ok but you can't put that old of a motor into that new of a car. it's 3x00 or bust, according to the feds lol

3.1POWER · 10-21-2008, 08:59 PM

thanks guys... prolly just pick up another motor....