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#1 |
Registered User
Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Tbi swap build thread
I am going to atemped my first build thread for who ever wanted to swap in a 87-94 STOCK TBI SYSTEM. I am going to use the intake (& all the hardware),throtlebody,stock wiring harness and all the other things you need to do this swap. I am going to go pin by pin, wire by wire ,and tell you where everything goes.
I know this is a common swap now a days but when I started looking for info for this swap i had do go and find info from alot of deferant web sites. I would like for people that are intrested in doing this swap when they google "tbi swap" they come to this site (67-72chevytrucks.com). So here we go. Here are some pics of my truck and motor. The motor is a 90 model 350 tbi motor. I swaped this motor in last year and i used it because I had plans on doing this very swap then. The reason I did not do the tbi swap then was because this truck came stock with a 4.3 in it. I did not want to swap a deferent motor and try to swap the truck to tbi at the same time. So I rebuilt this motor and bouhgt a eldebrok carb intake for tbi heads and used a quadrajet replacement holley. I will have some more pics tomarow so stay tuned.
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck Last edited by cjracing15; 04-13-2011 at 09:49 PM. |
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#2 |
Registered User
Join Date: Nov 2008
Location: richmond, va
Posts: 304
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Re: Tbi swap build thread
i will be watchin this
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#3 |
Registered User
Join Date: Oct 2009
Location: Summerset SD
Posts: 312
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Re: Tbi swap build thread
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#4 |
Registered User
Join Date: Jul 2010
Location: Colorado Springs, Colorado
Posts: 19
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Re: Tbi swap build thread
here is the updated diagram and pic of my surge tank.
Keith |
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#5 |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: Tbi swap build thread
Keith
Very nice - it should work. My only concern is to protect fuel system components from damage - rocks, etc. BTW where did you source that tank - is it home brew?? //RF
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"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) |
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#6 | |
Registered User
Join Date: Jul 2010
Location: Colorado Springs, Colorado
Posts: 19
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Re: Tbi swap build thread
Quote:
I got really lucky with the tank. I found it on my dads property. It is a high pressure tank from a very old refrigerator. I only had to add one port. I cleaned it out and pressure tested it for two weeks at 90 psi before deciding to use it. Thanks again Keith |
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#7 |
Sb 400 club
Join Date: Nov 2005
Location: NH / MA
Posts: 2,745
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Re: Tbi swap build thread
good Idea for a TBI build. This should be a great resource for others
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![]() ![]() 77 K10 Project / daily driver "The Grinch" http://67-72chevytrucks.com/vboard/s...d.php?t=318363 1956 Willys Wagon (327 chevy) Project (Now Buick 225) 1980 Corvette L-48 4 speed 1992 Mustang GT built 5.0 5 speed ![]() 1985 C10 LWB Sold 1982 K10 SWB plow truck Parted out 1986 D30 M1028 fire brush truck Parted out |
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#8 |
Registered User
Join Date: Feb 2007
Location: Memphis MI
Posts: 1,851
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Re: Tbi swap build thread
I'll be following along for ideas on my TBI 250 conversion! What trans do you have? And do you have cruise with VSS like the 1990?
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1987 2 ton ![]() 1982 ![]() Dad's 1981 ![]() Plus a mess o' tractors Last edited by D13; 12-04-2008 at 10:36 AM. |
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#9 | |
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Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Re: Tbi swap build thread
Quote:
Stay tuned.
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck Last edited by cjracing15; 12-05-2008 at 10:40 AM. |
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#10 |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: Tbi swap build thread
Part numbers of interest
Part Description Part # TBI ECM 1227747 BCC ASDU: 1227747 Heated O-Sensor 4-wire: 25312184; AFS75 TBI Overhall Kit: CK1081 Injectors (350) Orange Black: 17112493; 217-344; 5235206 Coolant Temperature Sensor (CTS): 12146312; 25036979 Throttle Position Sensor (TPS): 12116257; 17111787; 17111471 Manifold Absolute Pressure (MAP): 16137039; 2131545; 16017460; PS10076 Idle Air Control Valve (IAC): 17111460; 25527077; AC102 EGR Control Solenoid: 1997111?; EVS30; 17112193 VSS (from JTR): 2PRS Knock Sensor (350): 10456288; SU154 Engine Spark Control Module (ESC): 16128261; 16131231
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"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) |
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#11 |
Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: Tbi swap build thread
I`m watching too. I was to yank the carbed 305 from my truck and put a TBI 350 in it. Mine has dual tanks, does yours? would i need 2 fuel pumps or can I run 1 external pump?
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Anthony |
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#12 |
Registered User
Join Date: Mar 2007
Location: Farmington, MN
Posts: 928
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Re: Tbi swap build thread
It helps to have a wiring diagram for the donor vehicle. It will take about half a day to sort out and remove all the unneeded circuits. The harness on the newer style trucks comes through the fire wall on the passenger side near the heater box, so some of the wires may be too long or short for a factory appearing installation. Good luck. This should be helpful for a lot of people.
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I can still count my vehicles on two... wait three hands. |
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#13 |
Registered User
Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Re: Tbi swap build thread
Ok here we go I got all the pins labeled today was able to take two pics before the camera batt's played out (got new ones tonite), will show the labeled harness tomarow. Here are the two I got off today. It's the engine after I striped all the top-end off. I am rather proud of how clean my rebuilt engine is after a year of daily driving (and a little off road stuff).
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck Last edited by cjracing15; 12-04-2008 at 10:16 PM. |
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#14 | |
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Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Re: Tbi swap build thread
Quote:
I looked at a 92 today and they would probably have a little extra wire if you use that harness but not so much that you could not make it look factory if you wanted to. ![]()
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck |
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#15 |
Registered User
Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Re: Tbi swap build thread
Ok here are all the pin outs and the color of the wires. My computer is the standard #1227747
A1- grn/wht- this wire is used to power the fuel pump-relay. A2- no wire A3- no wire A4- gry- to egr-relay. This is a ground for the ECM to control the EGR relay. A5- brn/wht- service soon light. This is a ground to turn on the light. A6- pink/blk- switched 12v from the ignition relay. A7- no wire A8- ornange aldl serial data wire pin-e A9- wht/blk-aldl pin B When jumpered to ground will set the computer to diagnostic mode. A10- brn- VSS speed sensor signal to the computer, (This wire I will wire this to on side of a after market VSS sensor and the other wire on the sensor goes to ground). A11- blk- MAP sensor ground. A12- blk/wht- System ground. This wire is tied to other grounds in the harness and goes to engine ground. B1- orn- 12v batt power ( I looked and traced down this wire on my 87 cab harness and this is fuesed I think it was a 15). I will probably use a inline fuse. B2- tan/wht- Fuel pump signal from the relay. This one ties into several places, the fuel pump, the relay, and the ecm. When the relay is on it sends 12 volts to trun on the fuel pump. B3- blk/red- Distributor plug B4- no wire B5- purple/wht- Distributor plug B6- no wire B7- blk- ESC signal This is the knock sensor signal to the computer. B8- dk grn- AC signal. This tells the ECM that the AC is turned on. I am going to tie this into the ac clutch wire. B9- no wire B10-orange/blk- park neutral switch wire. some people say this is optional but I do not think it is because it gives a signal to the computer to give the engine a slight bump in rpm.(if you don't need it why did they put it there?) B11- no wire B12- no wire C1- no wire C2- brn- wire is not needed C3-grn/blk- Idle air control C4-grn/wht- Idle air control C5-blue/wht- Idle air control C6-blue/blk- Idle air control C3-C6 all go to the Idle air control valve plug on the TBI it's self. C7- no wire C8- no wire C9- purple/wht-Starter crank signal wire. Goes to the small terminal of the starter. C10- yel- Temp sender C11- lt grn- Map sensor C12- no wire C13- dk blu- throtle position sensor C14- gry- signal to map and TPS. ( you will see it tied together in the harness) C15- on wire C16- orange- This wire is tied with B1 so it is a 12volt wire D1- brn/wht- system ground goes to the engine. D2- blk- tied to the wires for the engine ground. D3- no wire D4- wht- distrbutor plug D5- tan/blk- distrbutor bypass. This is the wire that you disconnect to set your timing. D6- Tan- O2 sensor ground to engine. D7- purple- plugs in to the o2 sensor D8- D13 no wire D14- grn- Injector plug plugs into the top of injector D15- no wire D16- blue- Injector plug plugs into the other injector
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck Last edited by cjracing15; 12-06-2008 at 02:48 AM. |
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#16 | |
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Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Re: Tbi swap build thread
Quote:
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck Last edited by cjracing15; 04-13-2009 at 09:43 PM. |
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#17 |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: Tbi swap build thread
Pancake
Looks like you are digging into retrofit - full speed ahead For P/N switch functionality you'll have to wire a small, simple circuit which requires some wire (12 AWG purple and 16AWG, 1/4" crimp connectors (female and male), BOSCH 30 amp relay, and silicon diode 1N4001 - Radio Shack. Questions??? //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) |
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#18 |
Registered User
Join Date: Apr 2009
Location: Arvada, Colorado
Posts: 84
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Re: Tbi swap build thread
Ok...almost ready to put the tbi on my Blazer.....but have another question. I understand the wiring for P/N switch but do I NEED this for a manual tranny?
again, thanks for all the info and advice. |
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#19 |
Registered User
Join Date: Oct 2003
Location: OC CA
Posts: 1,374
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Re: Tbi swap build thread
pancake
To get things going it is not required, but having a neutral position sense switch will improve driveability (i.e. ECM alters idle and timing somewhat (depending on ECM, other parameters as well - EGR operation, AIR) between neutral position and being in gear. Leave B10 (orange-black) unconnected for now (this way ECM will see that truck is always in gear). //RF
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"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) |
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#20 |
Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: Tbi swap build thread
we need to make this a sticky or something. This is good info that can help alot of people. Thanks for taking the time to do it.
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Anthony |
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#21 | |
Registered User
Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Re: Tbi swap build thread
Quote:
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck |
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#22 |
Registered User
Join Date: Dec 2007
Location: Palmer, Alaska
Posts: 13,821
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Re: Tbi swap build thread
sweet!
subscribed! sticky???
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#23 |
Registered User
Join Date: Oct 2003
Location: Carmichael, California
Posts: 3,006
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Re: Tbi swap build thread
Are you asking what it is or asking to make thing thread one? I don`t remember seeing any here but on other sites I go to some threads like this one could be made into a "sticky" so that it didn`t get lost when new threads are made or others are posted on. It will always stay at the top so everyone can find it.
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Anthony |
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#24 |
Registered User
Join Date: Dec 2007
Location: Palmer, Alaska
Posts: 13,821
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Re: Tbi swap build thread
sorry, i wasn't clear....
I want this thread to BE a sticky ![]() very good info that I will need in the future ![]() shadetree, N2TRUX, old Rusty C10 , can one of you make it so?
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![]() ![]() Last edited by joe231; 12-05-2008 at 02:59 PM. |
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#25 |
Registered User
Join Date: Jan 2007
Location: Lexington, TN
Posts: 1,427
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Re: Tbi swap build thread
Well I did not get to my truck till late today. But I did get rid of all the wires I do not need on the harness. What you see in the first pic is the harness all labeled and sorted out. As you can see it is kind of in two parts. Tomarrow I am going to take apart all the tie points in the harness and that will untangle the last of the wires and then i will recrimp all the tie points like the factory but hopefully a little less of a spaghetti mess. I will take pics of before and after i do this.
The second pic is where i am going to run my wires in the cab. It is the rubber grommet for the esc brain. It is the same size hole that was in the 90 suburban, so it should work real nice. In the third pic you see the factory oil presure unit and switch adapter, in the last pic is the one out of the suburban that I will have to use because the tbi oil switch adapter has a different thread size than the carb model. I think I will just drill and tap the 90 model adapter for for the stock gage sending unit. You have to use this stock tbi switch to tell the ecm that the engine has oil press. because the fuel pump wire is run through this switch. I will try and post here again tomarow. stay tuned.
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The fleet 94 Chevy 4x4 reg cab 2018 Traverse (wifes car) 1977 SWB stepside 1949 Chevy truck Last edited by cjracing15; 12-06-2008 at 02:35 AM. |
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