I have a 94 v6 Vortec 4.3L so theres no throttle body or injectors i have replaced Throttle Positioning sensor, Ignition Coil, Plugs, Wires, Battery, Oil Change, Air Filter, Fuel Filter, and the Fuel Strainer.........i am stumped and i dont understand what else it could be.........please help need serious advice
Your problem is a leak in the cpi pletium most likely the pressure line has a leak
had same problem with mine $45.00 PRESSURE LINE KIT AND $15.00 GASKET FOR PLETIUM and 2 hours labor problem sovled.
You can remove vortec cover and remove air regulator to look inside pletium. I had gas vapor on driver side . that is where fuel lines are. fuel regulator is on passenger side. turn key on and look in hole and see where fuel is spraying. taking pletium off you can again turn key on and make sure where fuel is coming from.
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Re: wont start has fuel and has spark
These vehicles are known to have problems with the fuel pressure regulator/and also fuel pump. you need to hook up a fuel press gauge to see how many lbs.ther are. being off 1-2 lbs.from spec will cause a no start that will drive you crazy.
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idling problems are usually created by a few things all attributable to the inlet manifold clean the earth behind the injectors. Spray soap and water around the gasket connecting the manifold to the head if it bubbles it leaks fix. Check all hoses are connected to the vacuum points around the throttle body if these are good , There are two points of idling controls at the throttle body electronic throttle positioning sensor located on the butterfly the other below this is the idle speed control sometimes the O-rings die around these and need to be replaced alternatively replace both . Check your fuel control valve , O-rings on this and the injectors create problems on the fuel rail
The Vortec 4.3 liter V6 is notorious for problems with the fuel injector.One injector solenoid feeds all 6 injector nozzles,and sometimes one whole side of the engine will not get any fuel.See if you can smooth out the engine by spraying some starting fluid into the throttle body(remove the rubber hose from the throttle body).If this doesn't seem to make a difference,you may just be dealing with an ignition problem(cap/rotor/wires/carbon tracks on the spark plug insulators).
One side of the injector plug at each of the two injectors has 12 volts key on engine off.
The other side is grounded by the PCM computer to fire the injectors.
Put a test light across one of the injector plugs while cranking, Watch for flashing.
Have the idle mixture motor replaced and clean the throttle body intake, throttle plate, and that throttle linkage you see on the side of the throttle body with throttle body cleaner. Also, dump some complete fuel system cleaner in your gas tank and fill it with premium for a change, you cheap bastard.
the probem is probably in the injector assembly whichis under the intake plenum.after removing it you will se the plastic tubes and ijector popit valves unlike actual individual injectors.this whole contraption must be replaced as an assembly.you can get repair manuals from this site or go to you library.it may actually be flooding as these had problems with leaking fuel pressure regulators which i think are also only part of the whole assembly.
the injectors are fired thru the engine cotrol module but it gets its signal to fire from the pick-up located inside the distributor if you are loosing injector pulse only the ignition module is bad if you are also loosing spark when you loose injector pulse your pick up is causing the problem if you replace the pick-up i recomend you change the ignition module when doing so because they work together and you have to remove the distributor to change the pick-up
1993 s-10 should have a 4.3 engine. Your symptoms tell me your throttle body injector is clogged, and only allows so much fuel to pass through it. Therefore, on a idle there is not enough fuel coming through to keep the engine running, or to start it. If you replace the throttle body injector your issue should cease.
I hope this information helps you, and I wish you luck on your repair.
check your Throttle Positioning sensor that should fix your rough idle the TPS controls the breather on the front of the engine its affixed to the right hand side of the throttle body just infront of the spyder on the V6 Vortec 4.3L Models