I have a 03 F-250 6.0. It has 143K. I took it to my local ford heavy truck service center. The truck has been running a little rough and lots of dark smoke when idling and when driving. Fuel mileage has been poor lately. At one point it threw a #4 cyl contribution and injector code. I got a call this afternoon and was told that they had 3 injectors that were "misfiring". Is this a electrical or mechanical problem with those injectors??? I guess what I am asking is what is misfiring exactly with these injectors?? Ford wanted to do a test on my truck when it is cold, so I will have a full diagnosis in the morning tomorrow.
Yes, I agree. THAT is the proper way to test them. The definition of a misfire to me, is a cylinder that is "not pulling its weight" in plain English. This can be caused by many components in the engine as I'm sure you are already aware. As far as mechanical or electrical, who's to say? What matters most is that it's not operating properly. I had a truck once that passed the injector buzz test with flying colours which only indicated the FICM was good, as was the wiring. It turned out that SIX out of EIGHT were bad. Your symptom of poor fuel economy is definitely consistent with their diagnosis.
Has anyone had any success with Hot Shot Secret??? I am planning on replacing all 8 injectors and glow plugs. Any other things to replace when I am tearing into the beast???
If you have the money, and at that mileage, replacing all eight injectors wouldn't be a bad idea at all. This is assuming that oil changes are all on schedule, as are fuel filter changes. As far as glow plugs go, I've only ever had to replace ONE glow plug on a 6.0L out of all the ones I've wrenched on so far. If the glow plugs are inexpensive enough, it wouldn't hurt to replace them. Just be prepared to replace the glow plug buss bar as well, since the process of removal is likely going to damage it when you attempt to access cylinder numbers 5 and 7. As far as the Hot Shot Secret, many of my fellow members on our inner circle on another website feel it's nothing more than "snake oil". The additives you SHOULD be using though, as Ford's PM-22-A and PM-23-A additives. Those WILL produce a very noticeable difference in performance as have been reported by many of my regular customers. We can't keep it on our shelves.
On a side note...At the 2010 World Ag Expo in Tulare Ca I had the oportunity to see the new 6.7, hear it run, and talk to all the Ford people there. I have to say it was pretty impressive. I am a little shy about buying a first year run of another ford diesel, as I bought a early 03 6.0. And we all know "THE REST OF THE STORY" on the 6.0. Although my 6.0 has been mechanically trouble free up till now.
Yes, I agree the new 6.7L does sound impressive. I am scheduled to attend a technical training course on it in April. Until it is released, and used out there in the real world, I really can't comment any further.