1994 gmc sierra 5.7 liter running problem

[slredstorm62]

my 1994 gmc sierra will start after it sits for a couple hours but then after its been ran for 10 or 15 minutes if i step on the gas pedal it will stall out and i have to hold the gas to the floor to get it to start back up. i came to the conclusion that it is flooding it self out but im not sure what would be causing it. i took all the spark plugs out and they were wet so i burnt the gas of them and put them back in but the truck wouldnt start back up, it just kept turning over and trying to start. the truck has spark and enough gas to turn over

[maxwedge]

Welcome to AF. I'd check for leaking injectors and scan it and look for a bad coolant temp sensor, it would read cold even after warmed up.

[slredstorm62]

its throttly body injection and i didnt notice any leaks on the 2 injectors

[maxwedge]

I know it is TBI, so on to the second suggestion.

[slredstorm62]

i checked the temp sensor with an ohm meter and the resistance was around 11,000 which is what it should be for the temp outside (23-25degrees)

[Marsal420]

If it's just cranking now, possibly check your coil. My 94 was just turning over but wasn't starting i changed taht and it runs strong now. Other then that im gonan try to think of what it could be but the coil was the first thing that came to mind.

[slredstorm62]

well the coil has spark and the wires do also so im not sure what could be causing the problem

[maxwedge]

Ok, so when it runs a while it dies out like it is flooded as you stated, I said check the coolant temp sensor , obviously under the conditions it stalls, it should read the engine temp by then, if it still reads 25 degrees that is your problem.

[slredstorm62]

no it wont start anymore but when its 25 degrees out the motor is 25 degrees and i checked after the truck had been sitting all day

[Marsal420]

Yeah it's most def the coolant sensor,called a friend of mine " he's a master mechanic " and with what i have read i explained it to him and he said that , it's the coolant sensor, and i guess on our year truck they go out alot, lucky me =) hasn't happened yet. Hopfully you solve the problem

[slredstorm62]

so the sensor is bad even if it reads 25 degrees when the temp of the motor is 25 degrees

[maxwedge]

If it won't start cold,and it is in fact flooding, disconnect one injector, give it time to clear out and see if it starts, then you must go on to what is holding the injectors open. BTW your last post was inadvertently deleted. Yes the coolant temp sensor could read 25 cold then stay there when warm, unusual though, even if it is bad you should get an inital start if it stuck at 25.

[slredstorm62]

so what do you think would be causing the injectors to stay open

[slredstorm62]

my brother tells me its the fuel sender but there could be many other things that lead to it and i dont want to spend a bunch of money on a sender and that not be the problem, also could the fuel pressure regulator be cuasing the problem?

[Marsal420]

Have you tryed bringing it to a mechanic? Atleast if it is somthing you can fix yourself you will get a direct answer to exactly what maybe causing the problem.