Re: O/T TBI to carburetor change

Posted by Bob on October 29, 2006 at 09:44:11 from (69.178.229.154):

In Reply to: O/T TBI to carburetor change posted by frankiee on October 29, 2006 at 04:45:08:

There's NOTHING involved in that TBI system that can't be cheaply fixed with new or salvage parts. You must have a buddy or someone who well help you at a resonable cost with a little knowledge of the system that can tell you what's wrong with it!

It's a GIANT step backwards to put a carb on it.

BUT, if you INSIST....

The "center head" is called the intake manifold. In about 1986, they changed the angle of the 4 center bolts to nearly vertical, so older carburetor manifolds wont fit. As you know, the carburetor won't bolt directly to the manifold you have. There should be SOME used factory "in-between" manifolds around that fit the new bolt angle heads, AND have a carb mount. The aftermarket guys (Edelbrock, etc.) make $$$ manifolds just for this application.

Eliminating the TBI will leave the 'puter dazed and confused, and it will probably revert to "base timing", meaning the engine will run like crap, and be a worse gas hog. That can be eliminated by installing an older distributor with vacuum and mechanical advance, or a $$$$ performance distibutor with built-in adjustable electronic advance curves. Also, if it's got a slushbox, even in 1993, the now-confused 'puter will at least control TC lockup (OR USED TO)! Potential BIG problem there. (There are $$$ aftermarket "workarounds" for that, too.)

You could use a fuel pressure regulator ahead of the carburetor, the type with a return line.

The fuel pump is NOT designed to operate against a closed inlet needle valve. In the TBI system, there is a fuel pressure regulator that holds the pressure in the 10-13 PSI range, and bypasses the excess to the tank. If connected to a carburetor, the pressure will go WAY above that, since there's no return, overloading the pump, and, likely forcing the carb's inlet valve open, causing flooding. Also, with this type of pump, the constant flow of excess fuel helps to keep the pump cool.

Unless you have a LOT of time and money to do this right, why not just repair the TBI?????

Replies:

• Re: O/T TBI to carburetor change Jon Hagen 10:17:01 10/29/06 (0)

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