How to Fix P0304 Misfire?
1 Answers
p0304 This diagnostic monitors the duration of the power stroke and compares this duration with other cylinders by analyzing the speed signal. Eliminate possible faults that may cause stalling; check the fuel system; check the ignition device; check the intake system; test cylinder pressure; check the crankcase ventilation; check the intake pipe. More details are as follows: 1. The engine control module uses the information from the crankshaft position sensor to determine when an engine misfire occurs and uses the information from the camshaft position sensor to determine which cylinder is misfiring. 2. The engine control module can detect each misfire by monitoring the changes in the crankshaft speed of each cylinder. If the engine control module detects a misfire rate sufficient to cause emission levels to exceed legal standards, it sets the fault code P0300. 3. Under certain driving conditions, an excessively high misfire rate can cause the three-way catalytic converter to overheat, potentially damaging the converter. When the converter overheats, malfunctions, and sets the fault code P0300, the malfunction indicator light will flash. 4. For a 4-cylinder engine, fault codes P0301 to P0304 correspond to cylinders 1 to 4; for a 6-cylinder engine, fault codes P0301 to P0306 correspond to cylinders 1 to 6; for an 8-cylinder engine, fault codes P0301 to P0308 correspond to cylinders 1 to 8; for a 12-cylinder engine, fault codes P0301 to P0312 correspond to cylinders 1 to 12. If the engine control module can determine which cylinder is misfiring, it sets the fault diagnosis code for that cylinder.
