I HAVE A 1993 CHEVY S10 BLAZER RUNS GREAT BUT NOW IT IS RUNNING RICH THE ENGINE IS NOT BURNING THE FUEL RIGHT I GOT SPARK JUST TO MUCH FUEL THE EXSHAUST IS BLOWING WHITE SMOKE AND SMELLS LIKE FUEL BAD,I PUT IN NEW PLUGS,ROTOR,WIRES,CAP,FUEL PUMP,BUT IT FUEL FOULS THE PLUGS,IS THIS THE FUEL PRESSURE REGULATOR OR A INJECTOR LINE LEAKING,PLEASE HELP,THANKS

These alone will case the problem with the running rich. It is getting more air so it is calling for more gas to keep it running. Get these problems fixed and will see a big differents in how it runs.

The first thing I would check is you are getting both spark and fuel at the cylinders. Remove one spark plug at a time and connect to it's plug wire while holding the end of the plug against a solid ground. Have someone crank the engine. If you see a good spark in the spark plug gap I would then make sure you have fuel at the cylinders. Cranking the engine for a bit. Then pull each spark plug out and check that fuel is on the end of the plug. If you have both fuel and spark at the cylinders I would look more at such things as timing belts, sensors, etc.

The pressure regulator is in the intake manifold when they go bad it either give low pressure or leak out affecting engine performance by burning rich(black smoke)

Check the fuel pump relay located inside the glove box .If its bad the fuel pump will still get power through the oil pressure sending unit its a safety back up system but will make a long cranking condution. Also check your fuel filter located under the drivers door on the frame rail inline . And i dough its running rich .Pull your spark plugs you have to go in from under the wheel wells for most .If they look white then its running lean .I would check the fuel filter before it cooks the fuel pump first. Spark plugs tell a story if you can read them . And how is your exhust system thats a nother big factor on how the engine performs extremaly imporant on the 4.3 vortec

If your car have an alarm system, check for a hidden shut off switch, it must be re-set to start the engine again.
sammyc47

Fuel pressure regulator

What it is is that the engine is running rich, check MAP sensor acts like a choke, make sure vacum hose is good and that it has vacum if ok you'll need to check injector's or the fuel pressure regulator or the fuel line for leaking fuel, the bad thing is that to get to these part's you will have to remove the in-take magifold , after removal of in-take have some one turn key to the on position and look for fuel leak's.

hi all the injectors and reg is inside the intake and are good about going bad. the top of the intake got to come off.

The firing order for a Chevy s10 depends on which engine you have. 1.9L engine the firing order is: 1-3-4-2 . Distributor rotates counterclockwise. 2.0L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise. 2.5L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise. 2.8L engine the firing order is: 1-2-3-4-5-6 . Distributor rotates clockwise. 4.3L engine the firing order is: 1-6-5-4-3-2 . Distributor rotates clockwise.

it could be your fuel injectors or your auto chock is closed and burning too rich