2.8 to 3.1 swap

[Buckley892]

I have a 1988 Grand Prix with the 2.8 5 speed and the engine went im looking at picking up a 3.1 for cheap and was wondering what all i need to do to get the old one out and the new one in and im wondering what im going to need to keep from the 2.8 to put onto the 3.1 so it will all be working in the end any help???

[gtpeddie]

swap a 3.8 L67 in it would be worth it

[blueguy]

Not sure really..

I'd find the wiring harness to both motors and see if everything is the same...I don't see why it would be that much different...they are both 60* V6's with just displacement differences IIRC.

I'd hop on over to the 60* V6 forum for more info brutha.

[MoarkatsINmuhtrailer]

2.8 and 3.8 have the same mounts something to look into

[Buckley892]

I already have the 3.1 thats why i wanna use that and i need it all to work so i can use the car to get to work since its my only one

[sic6]

The engine will work in your application. Just reuse the enigne brackets on your car. Depending on what car the 3.1 was previously in, it could have different brackets on it. no biggie though just swap them over. Also you need to change out the prom chip in the ecm with one from a 3.1. that way the calibration wont be off when you swap.

[Buckley892]

Where could i get the prom chip?

[blueguy]

From a 3.1 ECU?

That's my guess.

[Buckley892]

true im just wondering would i need the whole ecu or just the chip cause some other forums say that they used everything from the 2.8 except the injectors so would that work or would i still need the other prom chip?

[sic6]

Just get the prom chip from the car the 3.1 came out from. Its not hard to switch out.
Yes everything else is the same between the engines except for the injectors and having a different displacement.
You still need the prom due to it having different values for the air flow tables for the larger displacement.

[Buckley892]

thats the thing im not buying a car im just getting the engine thats all

[Slick2500]

Get on from a junk yard if all else fails.

[sic6]

Yes a junkyard would be your best bet.

[Buckley892]

What would the firing order be for a 3.1 and on this one i cant find where the coil pack goes i have my new 3.1 so im swaping my engine brackets and everything but do i need to change my injectors or will it work if i leave the 3.1 injectors in??? im kinda new to this and its my 1st swap