Question about 1986 Ford F 250

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6.9 litre diesel losing power over last few days of driving, changed fuel filter no difference,cannot get enough speed up to allow trany to shift, bogging bad. and blowing blue when reved, not black. starts fine but does not idel well and does not even sound like a diesel engine.

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Blue smoke is oil. With blue smoke and no power you should take the truck to a diesel reair shop to have it looked at. It could be that the valves need adjusting or it could be broken rings or a cracked piston, all of which are beyond the scope of online diagnosis. With a diagnosis in hand, you should pick up a copy of Haynes Diesel Engine Repair Manual, part #10330. It can help if you think you want to attempt the repairs yourself. Hope this helps.

Posted on Nov 18, 2009

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