93 chevy 1500 problems

Coreystultz

I have a 1993 chevy 1500 an it seems to be running rich. After running it for awhile it gets short on power and misses an when idleing it also sounds funny and i dont know if its somthing with the tbi or in the motor itself. The exhaust an oil smell rich with gas an i've resently changed the air filter, spark plugs,plug wires,distributer cap an rotor,an oil and oil filter.. what could it be?

Coreystultz

Oh an the service engine light comes on every once in awhile also.

Bigplanz

See if you can pull a code. I think on a 93 you ground the test terminal on the ADLI block to get the code to flash. CHECK IF THIS IS THE CORRECT PROCEDURE BEFORE YOU TRY IT!

I would bet it's an O2 or EGR code. You might just have vacuum leak, so check your vacuum lines.

Coreystultz

alright i'll give that a try an let ya know if it thats the problem.

Bigplanz

I guess I should have added: just because it is an O2 or EGR code doesn't mean that those sensors are bad. Throwing a code on those (in particular) can mean a bad injector, fuel pressure regulator, or a bad TBI throttle body to intake manifold gasket. If this truck has a 220 TBI it could be a gasket. They had a tendency to develop leaks over time.

Coreystultz

Yeah it does have a 220 tbi. I did jus notice that when i hit the gas it doesnt evenly mist out of the injectors its more like spirts and gas builds up in both barrels of the throttle body. Could it be bad injectors or o-rings?

Bigplanz

You have a bad injector. Fortunately, they are pretty easy to replace on the 220. Just be careful not to drop anything into the throttle body or you can end up having to take the intake manifold off to get it out.