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Warped Exhaust Valve
- Thread starter Yoyocafe
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That would be a burnt valve.
srteach
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HEAT. The commentor above is correct, it is called a burnt valve.
As to a more specific cause, running rich, bad plugs, over-revving the engine for extended period, basically fuel burning up as it exits the cylinder past the exhaust valve (think blowtorch on the valve).
Rockstar04
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A plugged cat, or a faulty EGR valve can also cause burned valves.
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