I noticed the other day while leaving a stop sign a nice cloud of blue smoke exiting the exhaust which seems to clear up while driving. It is also noticed on start-up for a longer than normal period of time. I kept an eye on it for a few days and finally made an appointment at the ford dealership. As far as modifications go I do have an aftermarket exhaust with cat delete installed and an SCT XCAL 2. Of course the truck was returned to stock before I took it in however I must note that the smoking issue is worse on the stock programming. I get my truck back today and this is the service write up: "Customer states vehicle is blowing blue smoke and has burned about a qt. of oil in the last 5k miles. Recommend changing oil and retesting. Called hotline and if the converter has been removed it will smoke due to part of the converters job on these is to absorb some smoke poor quality oil can cause more smoke than normal. Verify concern. Check oil and fuel quality-fuel quality-OK oil due for oil change and 1 qt. low. Perform EEC quick test no codes present. Check power balance-OK. Check relative compression-OK. Check-Fuel Pressure-OK. Check charge air cooler system for abnormal oil-OK. Recommend changing oil and retesting. 1 qt. per 1k miles is specification." I changed the oil last at 26k miles and current mileage is 30950. I am changing the oil at 31k and have been using Rotella T Synthetic 5W40. I have had the exhaust installed for the past 15k miles and have not noticed this problem. I did change the fuel filters at 30,800 and noticed this blue smoke issue shortly after. Any ideas and what to look for would be greatly appreciated. Thanks.

 

Did you use OEM Racor fuel filters or A/M "will fit" filters?

Blue or blue/white smoke:
Caused by insufficient fuel or oil consumption. Normal when engine is cold or idling for extended periods.
Excessive smoke could be caused by air in the fuel, contaminated fuel, loose or plugged injectors, worn or leaking injector o-rings, thermostat stuck open, oil consumption. Also PCM inputs such as MAP or ICP sensors.

Check to make sure the fuel filter caps are tight and have now cracks, you may have air in the system.

Hope this helps

 

Racor fuel filters were used and smoke is pure blue that I can see. I give the caps a check tomorrow but I am pretty sure they are tight enough and not overtighthened.

 

Since you just changed the fuel filters 150 miles ago you may still have some air in the system, or a small leak in the system. Also did you get your diesel fuel from a different supplier this time? Maybe you got some poor quality fuel.

 

There may be some air in the system from the change. Is there a procedure that needs to be followed to clear the air from the system or just some more driving? I havent gotten fuel from anywhere different than I normal use.

 

Kiddy,

As long as there are no air leaks in the system the air should work its way out of the fuel system fairly quickly.