4.3 tbi to 350 tbi

***98layinframe*** · 11-05-2009, 09:51 PM

i know there has to be a bunch of threads on this.. but cant seem to find them.

anyways i have a 4.3 tbi 89 s10 with a 91 tbi harness in it. (previous owner hacked the shit out of the original harness so i just swapped it out) I also own a nice 91 suburban with a 350 tbi motor in it that im considering tossing into the s10. Will that motor connect directly up to my s10's harness, computer, and run fine? run lean? would it be better to run the computer out of the burban? any need to swap the tbi setups around? so basicly is there any issues with the wiring and fuel calibration that i will need to change other then swapping parts?

**03blazer** · 11-05-2009, 10:14 PM

The harness on your 4.3 will work on the 350. Just swap the chips from the suburban computer to the computer in your s10.

Aftershoxxx · 11-05-2009, 10:28 PM

yup what he said or if u dont wanna spend the extra time takin the chip out just swap complete computers, i'm finishin up a tbi to tbi swap now

kjm762 · 11-06-2009, 10:57 AM

The ESC module also has to be changed over.

Aftershoxxx · 11-06-2009, 11:12 AM

yup almost forgot about that...93-95 tbi's dont but the older ones do

***98layinframe*** · 11-06-2009, 01:19 PM

esc module? what and where is it?

Arich0908 · 11-06-2009, 06:06 PM

use the whole TBI unit off the suburban and the ecm.

Aftershoxxx · 11-06-2009, 10:28 PM

it basically controls teh spark of the system and it should be on the firewall if i remember correctly.

BadS15v8 · 11-10-2009, 12:12 PM

Quote: Originally Posted by 98layinframe

esc module? what and where is it?

On my 91 it's on passenger side beside the blower motor, almost center'd on the firewall but more to passenger side

***98layinframe*** · 11-10-2009, 03:07 PM

ok good deal, i know exactly what part you guys are talking about.

Now i just have to deal with fighting the steering column and clearing the headers or manifolds which ever i decide to run.

skylarkmk · 11-10-2009, 08:23 PM

whats the part number on a ESC for a 350 TBI? I have a few in my garage and i cant remember which is for a 350 and which is for a 4.3

bouchee2007 · 12-03-2009, 11:39 PM

not to jack a thread but would a 95 350tbi harness work with my 91 4.3tbi, granted i swaped out the ecm and all of the other necessary components?

s10-den · 12-04-2009, 05:48 PM

you need the 1227747 computer AND the ESC

bouchee2007 · 12-04-2009, 11:08 PM

thanks

beradnichol · 12-04-2009, 11:51 PM

I have a 97 blazer 4.3 and I want to put a v8 in it. I work in a scrap yard so I get trucks all the time. could I just get any chevy motor in the same general year and swap the chips out to avoid a harness swap like said at the top of this forum?

BadS15v8 · 12-05-2009, 01:36 PM

With a 97 if you found same year or 96+ you would only have to add a few wires to you harness and have the computer programmed. Check sticky at the top there's a post up there about your model swap

11-05-2009, 10:14 PM	#2
03blazer Gettin' ready for V8! Join Date: Dec 2007 Posts: 405 Location: Gulfport, MS User is: OffLine	Re: 4.3 tbi to 350 tbi The harness on your 4.3 will work on the 350. Just swap the chips from the suburban computer to the computer in your s10.
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11-05-2009, 10:28 PM	#3
Aftershoxxx Not rich, Just broke Age: 27 Join Date: Jan 2004 Posts: 760 Location: Alexandria, LA User is: OffLine	Re: 4.3 tbi to 350 tbi yup what he said or if u dont wanna spend the extra time takin the chip out just swap complete computers, i'm finishin up a tbi to tbi swap now
	[Reply w/Quote]

11-06-2009, 10:57 AM	#4
kjm762 Registered User Age: 47 Join Date: Mar 2007 Posts: 630 Location: User is: OffLine	Re: 4.3 tbi to 350 tbi The ESC module also has to be changed over.
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11-06-2009, 11:12 AM	#5
Aftershoxxx Not rich, Just broke Age: 27 Join Date: Jan 2004 Posts: 760 Location: Alexandria, LA User is: OffLine	Re: 4.3 tbi to 350 tbi yup almost forgot about that...93-95 tbi's dont but the older ones do
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11-06-2009, 06:06 PM	#7
Arich0908 Registered User Age: 30 Join Date: Oct 2009 Posts: 65 Location: User is: OffLine	Re: 4.3 tbi to 350 tbi use the whole TBI unit off the suburban and the ecm.
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11-06-2009, 10:28 PM	#8
Aftershoxxx Not rich, Just broke Age: 27 Join Date: Jan 2004 Posts: 760 Location: Alexandria, LA User is: OffLine	Re: 4.3 tbi to 350 tbi it basically controls teh spark of the system and it should be on the firewall if i remember correctly.
	[Reply w/Quote]

11-10-2009, 12:12 PM	#9
BadS15v8 Registered User Age: 23 Join Date: Aug 2005 Posts: 1,126 Location: User is: OffLine	Re: 4.3 tbi to 350 tbi Quote: Originally Posted by 98layinframe esc module? what and where is it? On my 91 it's on passenger side beside the blower motor, almost center'd on the firewall but more to passenger side
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11-10-2009, 08:23 PM	#11
skylarkmk Registered User Age: 26 Join Date: Mar 2008 Posts: 138 Location: User is: OffLine	Re: 4.3 tbi to 350 tbi whats the part number on a ESC for a 350 TBI? I have a few in my garage and i cant remember which is for a 350 and which is for a 4.3
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12-03-2009, 11:39 PM	#12
bouchee2007 local engineer Age: 21 Join Date: Mar 2009 Posts: 356 Location: Berkley Mass User is: OffLine	Re: 4.3 tbi to 350 tbi not to jack a thread but would a 95 350tbi harness work with my 91 4.3tbi, granted i swaped out the ecm and all of the other necessary components?
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12-04-2009, 05:48 PM	#13
s10-den takes 2 balls in our game Age: 37 Join Date: Nov 2005 Posts: 4,704 Location: florida User is: Online	Re: 4.3 tbi to 350 tbi you need the 1227747 computer AND the ESC
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12-04-2009, 11:08 PM	#14
bouchee2007 local engineer Age: 21 Join Date: Mar 2009 Posts: 356 Location: Berkley Mass User is: OffLine	Re: 4.3 tbi to 350 tbi thanks
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12-04-2009, 11:51 PM	#15
beradnichol Registered User Age: 22 Join Date: Dec 2009 Posts: 1 Location: User is: OffLine	Re: 4.3 tbi to 350 tbi I have a 97 blazer 4.3 and I want to put a v8 in it. I work in a scrap yard so I get trucks all the time. could I just get any chevy motor in the same general year and swap the chips out to avoid a harness swap like said at the top of this forum?
	[Reply w/Quote]

12-05-2009, 01:36 PM	#16
BadS15v8 Registered User Age: 23 Join Date: Aug 2005 Posts: 1,126 Location: User is: OffLine	Re: 4.3 tbi to 350 tbi With a 97 if you found same year or 96+ you would only have to add a few wires to you harness and have the computer programmed. Check sticky at the top there's a post up there about your model swap
	[Reply w/Quote]