Quote:
Originally Posted by Cervan
White smoke is unburnt fuel alltogether, black smoke is partially burnt fuel. meaning that either too much fuel is being injected (lets save that for last..) Or, not enough air is avalible on the combustion stroke to burn all the fuel.
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He swapped IP's and had the same problem, so it's highly unlikely the problem is excess fuel. Sounds like an air restriction problem, and since the valves & filter are ok, the only remaining option (that I can think of) is the turbo.