2000 Ford F250 spark knock

2000 FORD F-250
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AFFORDATRUCK
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Computer problem
2000 Ford F250 V8 Four Wheel Drive Manual 137k miles
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all new sensors have been changed.all the gas ran out and new put in.new plugs and coil packs...

still knocks

i'm a used truck dealership.light duty to heavy duty.if you can answer this question i will pay for other answers.cause this truck has cost a fortune but i have two other trucks that do it.
Sep 9, 2008 at 3:11 PM
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DOCFIXIT
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Was the knock sensors replaced on rear of engine one on each head?
Sep 9, 2008 at 3:20 PM
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MERLIN2021
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Probably too much carbon built up in the cylinder heads, try combustion chamber cleaner, all manufacturers sell a product to de-carbon.
Sep 9, 2008 at 3:34 PM
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