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#1 |
Registered User
Join Date: Oct 2018
Location: Gainesville Georgia
Posts: 5
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Question about tbi to Rochester 2 barrel
So I just bought a 1987 Chevrolet r10 with a tbi on it and the tbi is shot so what I was wondering was I have a Rochester 2 barrel laying around would it fit in place of the tbi and would it run right with all those sensors and everything not being hooked up to the carb.
Thanks, Bryson |
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#2 |
Registered User
Join Date: Jan 2011
Location: Chattanooga, TN
Posts: 2,149
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Re: Question about tbi to Rochester 2 barrel
You have no mechanical fuel pump so you will have to deal with that (you can't use the electric in-tank pump with a carb). The block may or may not be machined for it. The electronic distributor won't work without the computer. But in simplistic terms an intake is an intake. If you can bolt on a carb leak-free and supply fuel and spark then yes it will run. If it were me, I would much rather make a TBI work than a 2-bbl carb. The TBI is a very simple system. You will also have issues if you have a 700R4 transmission with the TV cable and a 2-bbl.
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'83 K20-TPI '73 C10 '79 C10-ex-diesel(SOLD) '07 Tahoe(Son driving) '14 Suburban-DD '71 C10-current project |
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#3 |
Moderator
![]() Join Date: Dec 2012
Location: ON, Canada
Posts: 2,157
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Re: Question about tbi to Rochester 2 barrel
Define "shot" please. The TBI is easy to work on, cheap to service, and ultra reliable. I wouldn't downgrade to a carb.
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#4 | |
Registered User
Join Date: Oct 2018
Location: Gainesville Georgia
Posts: 5
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Quote:
P.S. I pulled the plugs and all 8 are black. Could it be some sensor or something? If you can help let me know. Thanks again Posted via Mobile Device Last edited by byopp12789; 10-23-2018 at 05:29 AM. |
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#5 | |
Registered User
Join Date: Oct 2018
Location: Gainesville Georgia
Posts: 5
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Quote:
P.S. I pulled the plugs and all 8 are black. Could it be some sensor or something? If you can help let me know. Thanks again Posted via Mobile Device |
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#6 |
Senior Member
![]() Join Date: Aug 2004
Location: Centennial, CO
Posts: 2,946
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Re: Question about tbi to Rochester 2 barrel
Will it start and idle with the engine cold? Does it get worse as it warms up?
The injectors rarely go bad on these, as you found out. Do you have a fuel pressure gauge?
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ClusterTruck: 68 C10 Bought in 89, wrecked in 03. Slow low $ rebuild started '17. 6.0 & TKO http://67-72chevytrucks.com/vboard/s...d.php?t=788602 93 K1500 Short Step, 350, NV4500, EBL flash ECU. Vortec heads & roller cam someday... 05 Jeep Wrangler Unlimited. 3” lift & 6-speed 02 E320 the insurance total “free car” 13 Tahoe LTZ |
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#7 |
Registered User
Join Date: Feb 2011
Location: Parkville, MD
Posts: 1,024
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Re: Question about tbi to Rochester 2 barrel
Clean up the plugs. Run the codes. Disconnect the battery to reset the ECU. If it gets better after the ECU reset, then gets worse again, it'd blame a sensor. If it stays about the same, I'd look at non-sensor issues like fuel pressure. A good manual should have troubleshooting steps.
Found this with a little searching. http://www.73-87chevytrucks.com/tech...TBISystems.pdf
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1970 C20 Custom Camper - 350, TH350 1997 GMC Suburban 1994 Acura Integra GSR 1987 Dodge Daytona Shelby Z |
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#8 |
Registered User
Join Date: Oct 2015
Location: IN
Posts: 209
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Re: Question about tbi to Rochester 2 barrel
If you can found a good scanner that tells you what your sensors are reading, that will really help.
I had a truck that had TBI and ran rich and would die when you put in gear. MAP sensor wasn't reading right. Ended being the wire going from the MAP sensor to the ECM was bad. So that bad wire made the ECM think it at full throttle and ran really rich. Bad o2 sensor could also make it run rich. Bad coolant sensor would also make the motor run rich, because the ECM will think it's really cold when it's not. You can check the MAP sensor by using a multimeter and checking to see if it's getting 5 volts from the ECM. Then you can check how much voltage is going back to the ECM should be around 4.90 volts or so. You can also check your coolant sensor, which is next to the thermostat housing, by unplugging the coolant sensor and setting your multimeter to ohms. Then check the resistance across the 2 prongs on the coolant sensor. Reading should be around 5670 if the motor temperature is 50 degrees F. Also do a visible check like is everything plugged into the sensors and are there any broken or burnt wires. |
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carberator, chevy c10, quadrajet, tbi 350, tbi engine |
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