Switching TBI to EFI?

NMASINGILL86

MEMBER
1991 CHEVROLET S-10
4.3L
6 CYL
2WD
AUTOMATIC
80,000 MILES

Yes, I’m new. Probably going to get some ridicule for this one. I am building up my vehicle listed above. It has the 4.3l v6 TBI 262ci. I want to know if it’s possible and worth it to switch from TBI to EFI? I have read a million different things about converting to carb and MPFI, but nothing goes into detail about EFI.

Is it even a possibility?

4 Replies

NMASINGILL86

MEMBER
3 POSTS

Or is TBI and EFI the same thing? It looks like I can buy the EFI, and it bolts right up.

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Thursday, April 20th, 2023 AT 6:14 PM

STEVE W.

MECHANIC
13,167 POSTS

Throttle Body Injection is a form of Electronic Fuel Injection that uses a part that looks like a carburetor and two small injectors. Multi Point Fuel Injection is another version, and it uses either the spider style injector like the 4.3 had for years or individual injectors and controls for each one. I would actually stay with the throttle body injection as it works and is reliable and you wouldn't need to change a lot of the electronics and fuel system like you would to use MPFI.