When did GM stop using TBI? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

*JCampbell* · 02-28-2012, 02:05 AM

What year did GM stop using TBI? I found a '96 454/4L80E combo for sale and I can't really tell, but from the pics, it looks to be TBI. I was under the impression TBI ended in '95.

gchemist · 02-28-2012, 02:15 AM

GM ended TBI FI in '95. A throttle body was used in 96+, but FI is down with a spider underneath the upper intake.

rfmaster · 02-28-2012, 02:26 AM

Quote:

Originally Posted by JCampbell

What year did GM stop using TBI? I found a '96 454/4L80E combo for sale and I can't really tell, but from the pics, it looks to be TBI. I was under the impression TBI ended in '95.

In US 95 was the last model year for TBI in trucks and vans. Although, there were a handful of vortec based TBI vans sold as fleet vehicles for a short time during 96 model year. TBI was also used in industrial and marine applications.

1996 was a switchover year - OBDI was no longer acceptable to EPA and OBD-II was mandatory. TBI could not master requirements and vortec port EFI was the solution. The 454 Vortec TB may appear similar to TBI. Ask for better photos!

//RF

BigBlocksRule · 02-28-2012, 09:05 AM

The difference in appearance between TBI and the L29 port injection intake on a 454 are night and day. Throttle body is on the passenger side and points roughly toward the front corner of the hood. A TBI engine will have an intake that looks like a conventional carbed type. You could have a holdover of some sort.

*JCampbell* · 02-28-2012, 11:17 AM

Here's the ad:

http://inlandempire.craigslist.org/pts/2855708801.html

thirdstreettito · 02-28-2012, 12:19 PM

Im pretty sure thats TBI, but ask him to take the air cleaner off just to be sure.

*JCampbell* · 02-28-2012, 12:29 PM

He hasn't responded to my email yet. Maybe I'll give him a call.

Keith Seymore · 02-28-2012, 01:10 PM

1996 454 is SFI (assuming that's the engine that came in it originally).

K

BigBlocksRule · 02-28-2012, 01:31 PM

That's a TBI engine, I think he's probably a year off on his model. Should be a 4L80E tranny, though.

79bonanza · 02-28-2012, 01:58 PM

the truck in the pic isnt a 96, look on the fire wall and you can see where the fuses were at on the early style of that body style. that truck should have a big fuse block on the driver side fender to be a 96 or newer truck.

*JCampbell* · 02-28-2012, 02:21 PM

So it's def a TBI engine, right?

1BadAction · 02-28-2012, 02:23 PM

Quote:

Originally Posted by JCampbell

So it's def a TBI engine, right?

Absolutely.

1986c10 · 02-28-2012, 02:24 PM

yes

1BadAction · 02-28-2012, 02:26 PM

and I must say, looks like an excellent deal if the trans is in decent health.

rfmaster · 02-28-2012, 02:52 PM

Air cleaner assembly looks like BBC TBI.
The 7427 PCM has transmission anti abuse code to minimize transmission abuse. As long as fluids were changed regularly it should be in good shape.
Make sure to unbolt fuse panel, crab ALDL connector and VSSB module if you go with it.. Disconnect engine bay harness from bulkhead connector under brake booster. Fish EFI harness from inside cab out into engine bay. Do not forget the PCM!

//RF

gchemist · 02-29-2012, 01:47 AM

Definately TBI with that air cleaner. SPFI uses an all plastic housing.

This is SPFI

BigBlocksRule · 02-29-2012, 07:50 AM

^ that's a 350, looks nothing like SFPI on a 454, it's a big honkin' aluminum thing. Sorry, I don't have a pic...

1BadAction · 02-29-2012, 09:29 AM

BigBlocksRule · 02-29-2012, 10:10 AM

Thanks BadAction.
Where did you get the intake setup?
One cool thing about this intake is that it's a natural for forced induction!!!

*nekkidhillbilly* · 02-29-2012, 11:54 PM

Quote:

Originally Posted by BigBlocksRule

^ that's a 350, looks nothing like SFPI on a 454, it's a big honkin' aluminum thing. Sorry, I don't have a pic...

yeah it looks like a big version of the vortec 4.3 intake. but didnt the later 454 and 350 mpfi look the same like in 98 i cant remember

1BadAction · 03-01-2012, 12:26 AM

Quote:

Originally Posted by BigBlocksRule

Thanks BadAction.
Where did you get the intake setup?
One cool thing about this intake is that it's a natural for forced induction!!!

google image search

I agree, especially a turbo!

02-28-2012, 02:05 AM	#1
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	When did GM stop using TBI? What year did GM stop using TBI? I found a '96 454/4L80E combo for sale and I can't really tell, but from the pics, it looks to be TBI. I was under the impression TBI ended in '95.

02-28-2012, 02:15 AM	#2
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: When did GM stop using TBI? GM ended TBI FI in '95. A throttle body was used in 96+, but FI is down with a spider underneath the upper intake. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

02-28-2012, 09:05 AM	#4
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: When did GM stop using TBI? The difference in appearance between TBI and the L29 port injection intake on a 454 are night and day. Throttle body is on the passenger side and points roughly toward the front corner of the hood. A TBI engine will have an intake that looks like a conventional carbed type. You could have a holdover of some sort.

02-28-2012, 11:17 AM	#5
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: When did GM stop using TBI? Here's the ad: http://inlandempire.craigslist.org/pts/2855708801.html

02-28-2012, 12:19 PM	#6
thirdstreettito Resident of Here Join Date: May 2008 Location: Wesley Chapel, FL, USA Posts: 7,716	Re: When did GM stop using TBI? Im pretty sure thats TBI, but ask him to take the air cleaner off just to be sure. __________________ ~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck

02-28-2012, 12:29 PM	#7
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: When did GM stop using TBI? He hasn't responded to my email yet. Maybe I'll give him a call.

02-28-2012, 01:10 PM	#8
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,207	Re: When did GM stop using TBI? 1996 454 is SFI (assuming that's the engine that came in it originally). K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/ Last edited by Keith Seymore; 02-28-2012 at 01:39 PM.

02-28-2012, 01:31 PM	#9
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: When did GM stop using TBI? That's a TBI engine, I think he's probably a year off on his model. Should be a 4L80E tranny, though.

02-28-2012, 01:58 PM	#10
79bonanza Registered User Join Date: Oct 2010 Location: sadieville, kentucky Posts: 167	Re: When did GM stop using TBI? the truck in the pic isnt a 96, look on the fire wall and you can see where the fuses were at on the early style of that body style. that truck should have a big fuse block on the driver side fender to be a 96 or newer truck.

02-28-2012, 02:21 PM	#11
JCampbell Account Suspended Join Date: Apr 2008 Location: Hesperia, Ca Posts: 1,332	Re: When did GM stop using TBI? So it's def a TBI engine, right?

02-28-2012, 02:24 PM	#13
1986c10 Registered User Join Date: Apr 2010 Location: Vicksburg, Mi Posts: 323	Re: When did GM stop using TBI? yes __________________ 1979 C10 - swb, mild 327, restoration project 1979 Mustang - Turbo 5.3 / 4l80e 1976 K20 - Mild 396, 6" lift, 35's - sold 1986 C10 - lwb vortec 355- sold 1982 C10 - swb project- sold

02-28-2012, 02:26 PM	#14
1BadAction Registered User Join Date: Dec 2010 Location: Dallas, TX Posts: 160	Re: When did GM stop using TBI? and I must say, looks like an excellent deal if the trans is in decent health. __________________ 2010 Basalt Black Porsche Cayenne GTS - Daily driver 1991 2500 Suburban, Black - 454/80E tow monster, soon to go under the knife... Again. 1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac

02-28-2012, 02:52 PM	#15
rfmaster Registered User Join Date: Oct 2003 Location: OC CA Posts: 1,374	Re: When did GM stop using TBI? Air cleaner assembly looks like BBC TBI. The 7427 PCM has transmission anti abuse code to minimize transmission abuse. As long as fluids were changed regularly it should be in good shape. Make sure to unbolt fuse panel, crab ALDL connector and VSSB module if you go with it.. Disconnect engine bay harness from bulkhead connector under brake booster. Fish EFI harness from inside cab out into engine bay. Do not forget the PCM! //RF __________________ "The Beast" 1975 Chevrolet C20 longbed 350/700R4! with 3inch body lift Dual Flowmasters Super 40's! TBI retrofit completed (2007-07-29) New 383CID (+030) 08-304-8 9.5:1CR x36,005 (2012-12-17)

02-29-2012, 01:47 AM	#16
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: When did GM stop using TBI? Definately TBI with that air cleaner. SPFI uses an all plastic housing. This is SPFI __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

02-29-2012, 07:50 AM	#17
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: When did GM stop using TBI? ^ that's a 350, looks nothing like SFPI on a 454, it's a big honkin' aluminum thing. Sorry, I don't have a pic...



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02-29-2012, 09:29 AM	#18
1BadAction Registered User Join Date: Dec 2010 Location: Dallas, TX Posts: 160	Re: When did GM stop using TBI? __________________ 2010 Basalt Black Porsche Cayenne GTS - Daily driver 1991 2500 Suburban, Black - 454/80E tow monster, soon to go under the knife... Again. 1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac

02-29-2012, 10:10 AM	#19
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: When did GM stop using TBI? Thanks BadAction. Where did you get the intake setup? One cool thing about this intake is that it's a natural for forced induction!!!

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