1990 Chevy Truck

1990 CHEVROLET TRUCK
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MERLINKOCH
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1990 Chevy Truck

Engine has no power. Started missing about 2 weeks ago. Lots of black carbon(?) on tail pipe. Could this be from a bad cataletic converter? Maybe plugged up? Has 239,000 miles on it. No major motor repairs. Has been running fine until this happened. How do you check a cataletic converter?
Jun 17, 2010 at 8:40 PM
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RASMATAZ
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Hi merlinkoch, Welcome to 2carpros and TY for the donation

Could be a sign of running rich

1.Fuel pressure not within specs.Can be cause by restricted fuel return line or defective fuel pressure regulator.
2.Defective Oxygen Sensors.
3.Leaking injectors.
4.Coolant temperature sensor out of calibration.
5.Restricted air intake system.

Checking for a clogged-up converter -Either you use a pressure gauge thru the oxygen sensor or a vacuum gauge

Could also be caused by the following

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
False air leakage.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard
Jun 17, 2010 at 9:29 PM
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