When my 2003 Excursion 6.0 Diesel starts it runs rough as heck for about 10 minutes like it is not firing on all cylinders. What is wrong.

 

Are all the glow plugs working?

 

Just had My 05 F-250 pulled into service with the same probs but one morn she wouldnt start... 2 Probs Fuel Injector Control Unit (FICU) and 2 Blown head gaskets. FICU not covered under extended warrenty Head Gaskets were... Good Luck Hope this is not whats up with yours

 

More News to report!!!... Just got a call from the Ford Tech and they said that when they took the heads off to replace the gaskets that they twisted up like a pretzel (warped Heads) sooo she needs new heads too Whew Ive seen some stuff but this is incredible!

 

Sometimes a fouled fuel injector will cause the motor to run rough until it warms up. You can start with adding injector cleaner into your fuel, but if that doesn't help, you might want to consider having a diagnostic performed while the motor is cold. That should tell you if it's an injector and which one it is.