Stuck-open EGR valve or purge valve (solenoid) If the code P0300 occurs with other codes, such as, for example, P0171, P0101, P0102, P0420, P0401, the additional codes must be diagnosed first, as the random cylinder misfire often happens as a result of other problems. What can cause the code P0300 - Random cylinder misfire: Problems with the valvetrain components Low compression in the affected cylinder Examples of vacuum leaks include: leaking intake manifold gasket, broken PCV valve or PCV hose, disconnected vacuum line, cracked vacuum line A vacuum leak will cause misfire in the cylinder closest to the source of the leak. Carbon build up on valves and injectors (common in engines with Direct Injection) Damaged ignition coil primary circuit wires (often chewed by critters). Worn-out, cracked or fouled (in the photo) spark plugs. Steps to diagnoseįouled spark plug Carbon buildup on an intake valve Signs of automatic transmission problems. How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.
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