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What would cause an LS400 to accelerate very slowly run spuratic and not run at idle the check engine light comes on and the trac off light is lit and it smokes but no foul oder?

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2006-05-02 01:28:59
2006-05-02 01:28:59

My 94 ls 400 did the same thing. After several expensive parts replaced, I replaced the plugs and wires, and all acceleration/ sputtering/ smoking problems stopped. Hope this helps.

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Your car should not smoke when I accelerate. Maybe it caught fire because you dropped a cigarette. If my car smokes when I accelerate, it's because the piston rings are loose and oil is getting into the combustion chamber.

Because there is antifreeze int he system and it takes a while to burn through. Also replace the bottom hose too. <> If it smokes from under the hood, It has antifreeze on the engine exterior, You can wash it off. Or just drive it and it will burn off. If it smokes from the exhaust, There is engine damage.

That would require fixing / replaceing the VALVE SEALS in the heads.

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your getting oil into your exhuast that's why it smokes bad rings on piston or valves sticking

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If you notice it when you first start the engine, it could be bad valve seals and/or loose guides.

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