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Yes , it is more then likely the Catalytic converter is clogged ! Pull the O2 sensor before the Cat an do a back pressure test ! Testing for plugged clogged restricted exhaust converter An your P0172 means you have a rich condition , does not mean O2 sensor is bad ! Do you have 4.3 L vortex ? Could be bad fuel pressure regulator leaking ! caused your cat to have a melt down an starting to plug ! 4.3L or 5.0L vortex engines . with spider injectors ! chevy vortec p0172 p0175 So you have two problems ! Hope this helps !
Black smoke is an indication of too much fuel-running rich-in the cylinders. The air/fuel mixture is way off-too much fuel. Possible causes are cylinder misfires (runs and idles rough, a noticeable miss), leaking fuel injectors, or a failed fuel pressure regulator.
Take off the vacuum line to the regulator (on the fuel rail?)-if there is evidence of gas in the vacuum line, the regulator has failed and excess gas is being sucked into the engine through the vacuum line.
You should take a fuel pressure reading to check pressure against the specification for your car.
Also possible that the fuel metering is correct, but the air being supplied to the cylinders is lacking. A clogged air filter could cause that, but you would also experience a rough running condition. Since you didn't mention that, I would think the fuel metering is wrong-too much gas.
Hello if the engine only misses on start ups and goes away after running, then the most probable cause is a leaking fuel injector. try having the fuel injectors cleaned first. sometimes a high pressure cleaning will correct this problem
MANY THINGS WILL CAUSE MISSING AND NO POWER LIKE FAULTY TPS SENSOR. SOUND LIKE STOPPED UP FUEL FILTER, CLOGGED FUEL INJECTORS, CLEAN FUEL INJECTORS IF YOU HAVE ELECTRONIC FUEL INJECTIONS.OMIT IF YOU HAVE 2 BARREL CARBURETOR. DO A LITTLE TUNE UP.REPLACE DISTRIBUTOR CAP AND ROTOR. REPLACE SPARK PLUGS AND WIRES. A BAD IGNITION COIL WILL CAUSE ENGINE TO MISS.DO A COMPRESSION TEST CHECK FOR WORN CYLINDERS WILL CAUSE ENGINE MISS.
The 98 chevy blazer has a one spider injector that runs to six poppit valves where the fuel is injected into the cylinders.It is possible that the poppit valve may become plugged. Before looking into this more I would verify that the spark plug or wire is not the cause of your cylinder #5 misfire.
IF YOU GOT CYLINDER MISFIRE.OR OPEN FUEL INJECTOR.THAT WILL CAUSE THE PCM TO ENRICHEN FUEL MIXTURE.TO ADJUST TO DEAD CYLINDER.WHICH ACT AS A LARGE VACUUM LEAK.THATS WHY YOUR EXHAUST TAIL PIPES HAS A RAW FUEL SMELL AND WHITE SMOKES.