![]() ![]() Used installed parts can also be faulty.ĭiagnosing: The person is seeking help with a problematic car that has intermittent starting issues. If the coil output stage lacks a square wave, the crank sensor tests fine, and all power is present as expected, it suggests a faulty ECM as the underlying issue.įix: Replace ECM (be careful as this technician replaced for used ECM and the car still didn’t work until trying a different one). The other codes can point you in the right direction.ĭiagnosing: After checking the basic causes of no start like no fuel delivery or lack of spark, the technician used the oscilloscope and tested the ignition switch which was fine. Start your diagnosing by hooking up your OBD2 scanner and reading fault codes. Read the full study here, or just see below what can we learn from it. I dug up 120+ old service posts directly from a mechanics who experienced the P0300 issue and reported the fix afterward. If it’s accompanied by a P030X code for a specific cylinder, the spark plug/ignition coil or valves on that cylinder are probably faulty. OBD2 Code P0300: Random/Multiple Cylinder Misfire Detected means that the misfire was detected by PCM, probably caused by the fuel pump/timing issue. ![]() I studied misfire problems on more than 120 different vehicles and found out the most common causes and now I prepared you diagnosing guide to follow based on how real mechanics fixed their misfire issue. This will also prevent you from passing state emission inspection. You need to solve your misfire code as soon as possible to avoid damaging engine internals and expensive catalytic converter because unburned fuel is going through your whole engine and exhaust. ![]()
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