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The thick black smoke from your Isuzu Wizard 4JX1 engine typically indicates an issue with fuel combustion, often caused by an overly rich fuel mixture. Possible reasons include a malfunctioning fuel injector, a clogged air filter, or a faulty sensor (like the mass air flow sensor) affecting the air-fuel ratio. Additionally, worn or damaged engine components, such as piston rings or valves, may also contribute to power loss and increased smoke output. It's advisable to have the vehicle diagnosed by a professional to pinpoint the exact cause.

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