How to do a 3.1 to 3.8 engine swap.

Asked by Guru21918 Feb 28, 2020 at 03:52 PM about the 1998 Pontiac Grand Prix 4 Dr SE Sedan

Question type: Maintenance & Repair

I have a 1999 Grand Prix  sedan with a blown up
3.1. Yet has beautiful body. Also have a 2000
Grand Prix Se  with a 3.8 that runs good but looks
like hell. Want to swap motors. How big a job is
this? Is it worth it?

1 Answer
18,255

munron answered 4 years ago

It's a big job. As well as the engine/transmission, a lot of the electronics will be different. You will need the wiring harness and ECU from the donor car. Might even have to change the fuel pump. Plan on dozens of hours and lots of frustrations. Can't imagine a '99 being worth the effort unless you're just totally in love with the car for some reason. When you're all done its still a $1200 car on a good day.

1 people found this helpful.
Mark helpful

Your Answer:

Related Questions

Shortcuts

Search Pontiac Grand Prix Questions

CarGurus Experts

  • #1
    munron
    Reputation
    8,140
  • #2
    james sparrow
    Reputation
    7,480
  • #3
    Dorian Hendricks
    Reputation
    6,020
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Pontiac Bonneville
1 listing
Used Pontiac Firebird
18 listings
Used Pontiac Grand Am
2 listings
Used Chevrolet Corvette
29 Great Deals out of 767 listings starting at $15,900
Used Chevrolet Monte Carlo
7 listings starting at $9,800
Used Chevrolet Camaro
22 Great Deals out of 468 listings starting at $11,999
Used Ford Mustang
41 Great Deals out of 1,600 listings starting at $5,977
Used Buick Regal
3 Great Deals out of 22 listings starting at $6,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.