SERVICE ENGINE ROUGH IDLE
2000 Chevrolet Silverado • V8 2WD Automatic • 150,000 miles
My chevy silverado 1500 with 5.3L v8 has service engine light and p0300 (random eng misfire) and p0131 (o2 sensor- bank 1 sensor 1). the truck idles rough sometimes and at times the check engine light flashes while at an idle and idle gets even rougher. I have changed the plugs and wires, ran seafoam through the brake booster vac line, and still nothing is helping. The truck also has an extremely strong exhaust smell. Any help is greatly appreciated!
April 22, 2011.
April 22, 2011.
Engine running rough or misfiring can be cause by the following:
1.Defective spark plugs
2.Inadequate spark/coil,defective spark plug wire.
3.Lack of compression
4.False air leakage.
5.Faulty fuel injectors.
6.Insufficient fuel pressure.
8.EGR valve that is leaking.
10.Throttle position sensor.
11.Manifold absolute pressure sensor
12.Mass Airflow Sensor
13.Idle air control valve
Note: If it doesn't apply disregard it-
Listen to a hissing sound around the intake manifold/throttle body and vacuum hoses you can use a vacuum gauge
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