Last fall I purchased a 1985 F250 with NA 6.9(just for the engine). It is a high-altitude model(158 HP) by the sticker on the valve cover. I live in Colorado and a friend of mine is going to be using it a few months to tow a 6000 lb trailer around locally. It will be used from 5K feet up to 9K feet(no highway). I have a question about the excessive black smoke(extra fuel) it produces. Here at 5K feet it easily produces black smoke with very careful throttle application, let alone if I "get on it", all with no load and on level ground. When going up an incline it smokes if I try to maintain speed(not fast, ~6% grade, unloaded and no trailer).
It has just under 200K miles. I have no idea of the history(like injector age, IP age, etc). It starts easily off the manually controlled glow plugs and *seems* to have the power a NA at this altitude should have but the smoke is too much.
I figure I need to get it timed and then most likely "turn down" the pump to get the black smoke under control.
Is there anything else I should be looking at?
Could timing alone cause this smoke issue?
Thanks,
Ken
It has just under 200K miles. I have no idea of the history(like injector age, IP age, etc). It starts easily off the manually controlled glow plugs and *seems* to have the power a NA at this altitude should have but the smoke is too much.
I figure I need to get it timed and then most likely "turn down" the pump to get the black smoke under control.
Is there anything else I should be looking at?
Could timing alone cause this smoke issue?
Thanks,
Ken