Newbie 3.1 Question???

[sharkey]

i checked the vin the other day, it was a t, so it was a factory original motor.

[KingArthur]

So... will the 3100 from a 95 or 96 work in a 92. I mean, since the 3.1 Multi-port and the 3100 is a SFI. Want would I need to change on the 92 Lumina.

* computer
* wiring harness
* injectors
or will it all work together if the 8th vin number is a T?

[bszopi]

You can run a 3100 SFI on a 3.1 MPFI engine. People worry too much about SFI and MPFI. The SFI is for fuel economy and actually switches to batch (MPFI) at higher RPMs. Do a search on here, or in the engine swap section and you'll find several people on here running 3x00s on old ECMs.

[KingArthur]

So... will the 3100 from a 95 or 96 work in a 92. I mean, since the 3.1 Multi-port and the 3100 is a SFI. Want would I need to change on the 92 Lumina.

* computer
* wiring harness
* injectors
or will it all work together if the 8th vin number is a T?

[berettaboi]

its actually interesting...in 1994 cavaliers still had the 3.1 mpfi, and the 5 spd was available. in the beretta's 1994 showed the first year for the 3100 sfi motor...and no 5 spd. there was probably enough requests for a 5spd/v6 z24, so they used up the last of the mpfi motors in those.


and if putting a 3100 or 3400 (almost the same...just like 2.8-3.1), you can run it on your computer that is in the car...i dont know about wiring certain sensors up though.