Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

TBI to Carb wiring Help

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Old 06-03-2013, 11:23 PM
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TBI to Carb wiring Help

I have read all the FAQs and they are not answering my questions.

Basically I have a 91 camaro which was TBI. The ECM and engine harness has been removed but the gauge harness, lights, wipers, fogs, a/c, cruise still remain. I have a carbed donor car which had no A/C but has the complete harness for carb. Can I simply plug the harness for the engine/carb controls and sensors into the existing gauge harness and have it all still work or no? Haynes manual does not distinguish between years so I assume it is the same.

I also have a non-ECM controlled distributor and the relays for the fuel pump and fans remained behind.

Thanks in advance.
Old 06-04-2013, 07:02 AM
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Car: 86 T/A - 70 Z28/RS
Engine: Broke - 350
Transmission: 700R4 - M22
Axle/Gears: G80, 2.73 - ZQ9 G80 4.10
Re: TBI to Carb wiring Help

Your 91 Camaro has a speed sensor speedo. More than likely your donor car, if a Camaro, will have a cable driven speedo. You will be missing the two wires from the trans tail shaft going through the ECM bulkhead connector to the speedometer buffer board.

Carb cars use a mechanical fuel pump so you will still have to wire the fuel pump relay and use a bypass regulator to set the fuel pressure.

Here is a good link for schematics. http://www.austinthirdgen.org/index.php?pid=19

If you not going to use the ECM then you will also have to figure out how to wire up the TCC circuit as well.

Last edited by bestracing; 06-04-2013 at 07:05 AM.
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