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motor missing and and virates but no noise are rod knock sounds normal other than runing bad it shows code po281

Vehicle: 2007 ford 550 6.0 motor

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This code is the cylinder balance test where the number 7 cylinder is identified as not contributing, Yes it does run rough and there is a terrible noise, You try this is not a fool proof test but it the direction if the injector or engine, with the engine running open the oil cap if it get worse its a sticking injector

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