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James, Ford Technician
Category: Ford
Satisfied Customers: 3630
Experience:  Ford Senior Master Tech, Ford gas and diesel expert, ASE Certified
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F550: 6.0 diesel runs rough at idle and gets progressively

Customer Question

6.0 diesel runs rough at idle and gets progressively worse while idling only. Eventually shuts off after about 15 mins
Submitted: 2 years ago.
Category: Ford
Expert:  James replied 2 years ago.
Hello and thanks for choosing just answer. When the vehicle stalls if you remove the top fuel filter cap is it pressurized? If it is you likely are getting combustion gases in the fuel lines. To test for gases you need a couple of balloons. You loosen the fuel line from the fuel filter housing going into the cylinder head. You secure the baloons over the fuel line and remove the fuel pump fuse. Crank over the engine and see if the baloons puff up at all. The baloons shouldn't have any movement at all. Depending on what side of the engine is one helps narrow it down to one side. Without a scan tool to identify the original misfiring injector it can be hard to isolate it. If one injector goes bad like this Ford wants all 4 injectors on that side. It was a warranty thing.
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