interchanging a 3.4 L with a 3.1 L in a 03 grand prix

Asked by Mar 06, 2014 at 01:04 PM about the 2003 Pontiac Grand Prix SE

Question type: Maintenance & Repair

8 Answers

9,355

3.1L refers to pre-'95 motors fwd and rwd. 3.4L refers to pre-'95 DOHC fwd motors and OHV rwd motors. The 3100 and the 3400 are interchangable fwd motors. They will run without modifying the computer but you should do this.

12 out of 12 people think this is helpful.
35

Now if you change the motor do u have to change any of the wording for sensors

9,355

"change any of the wording for sensors" ? What are you asking

35

Sorry the wireing on the harness or block

9,355

The '94 (3100) and '96 (3400) through '05 are very similar engines. They use the same block, the 3400 is bored out. I cannot confirm that the wiring harnesses are the exact same through out the 11 years but that is easily fixed by putting your sensor on the new motor. There are some small differences in the 3100 after '00. But nothing a tuner can't fix. I would need to know the years and trims of the cars to help you further and which way your swapping. The main issue will be tuning the car as the computer is only setup to correctly fuel the stock motor. The simplest option is to swap computers. Next is to tune the stock computer for the larger motor, using a handheld programmer or better yet, tuning software. But they are close enough that it would run decent until you had time to tune it. The 3.4 DOHC would require a harness swap and lots of other work. The 3.4 rwd is all cast iron and has no benefits of being swapped.

1 out of 1 people think this is helpful.
35

I have a 99 Chevy Malibu with the 3.1 and would like to put the 3.4 in it if it would work. Cuz I know how to do all of the repairs due to working at a repair shop as a mechanic for so many year its just that oi have never seen it done before. And I would be using parts from a grand am about the same year cuz I will be doing other things to the car to improve the handling and power from the car. I will be putting rear disk brakes on it and trying to make it a sleeper cuz of all the rice burners out here.

3 out of 3 people think this is helpful.
9,355

I just found your other question. I'll reply there.

2 out of 2 people think this is helpful.
35

OK thanks

Your Answer

Add photo

Related Questions

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 3,814 nationwide Grand Prix listings starting at $900.

ZIP:

Search Pontiac Grand Prix Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,870
#2 Tom Demyan
Tom Demyan
Reputation 2,570
#3 munron
munron
Reputation 2,060
View All

Related Models For Sale

Used Chevrolet Impala
936 Great Deals out of 35,462 listings starting at $1,995
Used Pontiac Bonneville
8 Great Deals out of 669 listings starting at $995
Used Pontiac Grand Am
1,699 listings starting at $1,000
Used Chevrolet Monte Carlo
13 Great Deals out of 1,701 listings starting at $2,000
Used Chevrolet Malibu
1,124 Great Deals out of 82,792 listings starting at $1,800
Used Ford Mustang
580 Great Deals out of 41,215 listings starting at $1,699
Used Chevrolet Camaro
475 Great Deals out of 39,917 listings starting at $3,499
Used Pontiac GTO
9 Great Deals out of 512 listings starting at $5,500
Used Jeep Grand Cherokee
1,000 Great Deals out of 65,966 listings starting at $1,500
Used Pontiac Firebird
18 Great Deals out of 808 listings starting at $3,000
Used Buick Regal
161 Great Deals out of 11,415 listings starting at $1,995

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
14 Great Deals out of 472 listings starting at $900
2007 Pontiac Grand Prix For Sale
519 listings starting at $1,997
2006 Pontiac Grand Prix For Sale
3 Great Deals out of 638 listings starting at $1,550
2005 Pontiac Grand Prix For Sale
458 listings starting at $5,900