2004 Cadillac SLS Repair Question
My 04 seville had several codes.
A PO300 is a random misfire. Many things can cause it. Start easy.. check for vacuum leaks, and check fuel pump pressure to make sure it is within spec.
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if you have the engine scoped they will tell what cylinder is causing the misfire.it may be a bad plug or wire.
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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-
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