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Dougie Muir
03-23-2006, 05:11 PM
"The engine works perfectly in neutral and when going astern. In both cases it achieves high revs. However, when I put it ahead black smoke and oil come out through the exhaust and the revs are a lot slower! Any idea what the problem is?"

scott stephens
05-01-2006, 12:31 PM
check injector spray pattern. also check exaust mixing elbow for heavy carbon buildup; especially on U-type elbow