johnf250
Registered User
I have a 1985 6.9 l F250, I have had it since it was new. It only has about 155,000 miles on it and I have never had any problems with it except for head gaskets when it was new. I started adding fuel additive back when they started taking the sulfur out of diesel fuel. The last few years I started having problems with it running rough and missing some. Finally it would not start. Figuring the seals in the pump had gone bad I pulled the pump and replaced it with a re-manufactured pump. I marked the old pumps static timing marks position on the engine before taking it out. It was advanced a little. After replacing it and getting it started, it ran fine so I took it for a test drive.
While coasting it does not smoke. If you are on a flat no grade and just barely giving it fuel it starts puffing light blue smoke and misses and hesitates some. You press the accelerator and it clears up and runs fine. After driving it for a while it started smoking and missing when idling. I then replaced all the injectors with re-manufactured ones. Started engine and blue smoke cleared up. Took it for a test drive and it ran fine except for some times when barely pressing the accelerator it would puff blue smoke and hesitate some except this time it did it a lot less. If you give it fuel it clears up and runs fine. If you floor it and run it at maxed rpm it starts hesitating and missing. When you climb a steep grade it has all kinds of power and does not exhaust much black smoke like it did with the old pump. It has run good for the 2 days that I have been test driving it. Today while driving it started hesitating and missing and puffing blue smoke, it also does this while idling. Now it is missing and puffing blue smoke while idling and it won’t clear up while sitting parked revving the engine. What is wrong? I want to beat it with a sledge hammer it has got me so mad at it.
While coasting it does not smoke. If you are on a flat no grade and just barely giving it fuel it starts puffing light blue smoke and misses and hesitates some. You press the accelerator and it clears up and runs fine. After driving it for a while it started smoking and missing when idling. I then replaced all the injectors with re-manufactured ones. Started engine and blue smoke cleared up. Took it for a test drive and it ran fine except for some times when barely pressing the accelerator it would puff blue smoke and hesitate some except this time it did it a lot less. If you give it fuel it clears up and runs fine. If you floor it and run it at maxed rpm it starts hesitating and missing. When you climb a steep grade it has all kinds of power and does not exhaust much black smoke like it did with the old pump. It has run good for the 2 days that I have been test driving it. Today while driving it started hesitating and missing and puffing blue smoke, it also does this while idling. Now it is missing and puffing blue smoke while idling and it won’t clear up while sitting parked revving the engine. What is wrong? I want to beat it with a sledge hammer it has got me so mad at it.