How do you convert the car from TBI to carbureted?

KBAKER00

MEMBER
1990 CHEVROLET CAMARO
150,000 MILES

The car is a 1990 camaro. We recently put a new 350 in it instead of the 305. We have made it carbureted instead of the TBI. Do we need to take the computer out of the car? Will this work with a Borg Warner T5 transmission?

Thursday, June 14th, 2012 AT 5:49 PM

4 Replies

KHLOW2008

MECHANIC
41,815 POSTS

For a carburetted engine, the computer would be redundant so even if you do not take it out, it still has to be disconnected to prevent unnecessary current drain.

As to the transmission, if it fits, then it can work.

The fuel pump has to be replaced with one suitable for carburetted engines as the one for fuel injected models are too high pressured to be of any use. The wiring circuit for fule pump would have to be modified as there are no more computers to control the circuit.

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Thursday, June 14th, 2012 AT 6:26 PM

CADIEMAN

MECHANIC
3,544 POSTS

U still have to replace the intake and carb. Mallory ingition sys. And fuel pump that is the same pressure to start with.

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Thursday, June 14th, 2012 AT 6:42 PM

KBAKER00

MEMBER
2 POSTS

We replaced the intake and put a carburetor on it. It runs ok. We took it for a test drive but still had the temp sensor hooked up to the dash. The dash was reading 260 degrees so it shut the car down. I also have a manual temp gauge that was reading normal. The car sat for an hour and then it restarted.

If we disconnect the computer, will the speedo still work on the dash? If not, how do we fix this? Thanks

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Thursday, June 14th, 2012 AT 7:45 PM

KHLOW2008

MECHANIC
41,815 POSTS

You need to isolate the wiring of the distributor from the ECM to prevent the engine cutting off.

Based on schematic, the speed sensor circuit should work.

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Friday, June 15th, 2012 AT 4:11 PM