The OBD II system usually will NOT set a misfire code until the rate of misfires exceeds about two percent. If you see one or more cylinders that are showing misfire counts, focus your investigation on those cylinders. If the engine is misfiring but no codes have yet been set, and you have a scan tool that can access Mode 06 data (the raw misfire counts that are being tracked by the OBD II system), use your scan tool to look at the Mode 06 cylinder misfire counts. If a misfire is occurring in only one or two cylinders, you will usually find a misfire code for that specific cylinder rather than a random misfire code. Less common causes include bad spark plug wires, worn or fouled spark plugs, a weak ignition coil, dirty fuel injectors, low fuel pressure, or weak valve springs. The cause is typically a vacuum leak in the intake manifold, throttle body or vacuum plumbing, a defective Exhaust Gas Recirculation (EGR) valve that is leaking exhaust into the intake manifold, or even bad gasoline. If your CHECK ENGINE light is on and you have found a P0300 diagnostic trouble code (DTC) by plugging a scan tool or code reader into your vehicles diagnostic connector, your engine has a "random misfire" problem.Ī random misfire code can be set on newer vehicles with OBD II onboard diagnostics when multiple misfires occur randomly in multiple cylinders.
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HOW TO DIAGNOSE AND REPAIR RANDOM MISFIRE CODES (P0300 DTC) - Copyright Auto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Index, CarleySoftware
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