mikeag

I have a 1994 chevy silverado with a blown engine in it, and i am looking to put a 350 engine in it with a carburetor, the engine in the silverado is fuel injected, is this going to pose any problems??? if so what can i do

denisond3

Hopefully someone who knows more about the Silverados than I do will reply. Meanwhile, I see the problems being with getting the wiring that is in the Silverado now to work with an engine that is not going to have the sensors that the original engine did. The fuel pressure would have to be regulated down, but what is going to tell the fuel pump to run?. It probably depends on getting the 'run' voltage from the computer, which probably depends on seeing the input from the crankshaft position sensor - and lots of similar issues.
I dont know if your state has emissions testing, but in Va. the northern counties all do. If you modify a vehicle, it has to meet the original emissions criteria of the vehicle - or of the motor - Whichever is newer! And if I take a car in for the emissions test and the Check Engine Light is on - if fails the emissions test. They also to make sure the light isnt just unplugged. Your Check Engine Light would be on all the time because a carbureted 350 wont be likely to run evenly enough to keep the oxygen sensors in the proper range.
Im pretty sure there are fuel injected 350s that you might be able to adapt - but I believe that doing that would require getting the computer and the wiring harness from the donor car.
If you decide to use the different engine, I would be glad to know how you proceed.

Torch

If this is going to be a strictly off road truck and will never have to go through emissions testing again (or you don't have to deal with that anyway) it shouldn't be too much of a problem to drop the engine in and wiring what little wiring a carb. engine needs to run.

Where you are going to run into problems is (was mentioned in the previous posting) the fuel injection fuel pressure is going to have gas spraying out of every crack in the carb., you are going to have to get the fuel pressure down to 6psi or whatever pressure your carb. requires. I would suggest just disconnecting (and removing if possible) the fuel injection fuel pump and installing an after market carb. fuel pump.

Your other problem is going to be that several of your gauges are no longer going to work as their sensors are no longer going to be there, you could install one of those after market Water/Oil/Voltage gauge sets to get around this.

Personally this is a project that I don't see a happy ending to (for a number of reasons) the junk yard may end up being its final resting place. Your best bet would be to find another 1994 Silverado engine that will just drop right in without any modifications.

RyanBayles

going from EFI to carb problem would be the average stock fuel pump for a EFI setup puts out around 15 psi which could cause problems with the carb. Average fuel pressure for carbs are somewhere around 9psi.

If you bought a mechanical fuel pump and installed a dummy o2 senser then i dont see you having any problems.

MikeRWK

Why would he need a dummy 02 if he's going carb? from what i read there isnt going to be any ecu involved at all

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