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PCV VALVES: The spring tension of a PCV check valve is critical to the life of the catalytic converter.If there is too little tension,excessive amounts of oil can enter the combustion chamber. If there is too much tension, it could cause oil sludging. Never take this inexpensive emission device for granted because it could destroy a more expensive emissions device.Some newer vehicles use an electronic PCV valve to control crankcase vapors. Some TSBs have been issued and re-flash engine calibrations have been tweaked to help extend the life of the converter.
VIBRATION: Broken exhaust hangers and mount can cause the internal structure of the converter to fail. Signs of this type of damage may be a restricted converter.
EGR PROBLEMS: EGR systems are designed to reduce smog-causing nitrous oxides (NOx) emission and detonation (engine knock or ping) under certain driving conditions. This type of misfire can damage a converter.
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