[yellowjeepcj]

My 2003 6.0 CC 4x4 with 240,000 miles developed a shudder all of a sudden (very noticeable I was on a newly paved 4 lane highway) between 1000 and 1500 rpm last night on the way home. This morning I noticed a rougher than normal idle @ about 640 rpm and today I see a light bluish-gray smoke at idle with heavy grayish-black smoke on take off and driving at 2000 rpms. Truck still seams to have plenty of power. Could this be an injector or cracked head/head gasket leak or something else?

History of work done by Ford Dealer in the last 6 months- ball joints, rear main seal, seal between tranny and t-case, new turbo, new HP oil pump and regulator, New ERG valve. I still have the original serpentine belt (yes I know should have changed it but forgot about it when the oil pump and turb was replaced).

 

[Iqoair]

My 2003 6.0 CC 4x4 with 240,000 miles developed a shudder all of a sudden (very noticeable I was on a newly paved 4 lane highway) between 1000 and 1500 rpm last night on the way home. This morning I noticed a rougher than normal idle @ about 640 rpm and today I see a light bluish-gray smoke at idle with heavy grayish-black smoke on take off and driving at 2000 rpms. Truck still seams to have plenty of power. Could this be an injector or cracked head/head gasket leak or something else?

History of work done by Ford Dealer in the last 6 months- ball joints, rear main seal, seal between tranny and t-case, new turbo, new HP oil pump and regulator, New ERG valve. I still have the original serpentine belt (yes I know should have changed it but forgot about it when the oil pump and turb was replaced).

Engine light on?

 

[yellowjeepcj]

No the check engine light is not on.

 

[Iqoair]

No the check engine light is not on.

Blue smoke is burning oil, possibly from your turbo. Black smoke would indicate its running rich (Too much fuel). Keep an eye on your oil level. Without a scanner, or running some tests it could be a number of things. Let us know what you find.

 

[yellowjeepcj]

Leaving it at the Dealer tomorrow to get it checked out. Will let you know.

 

[yellowjeepcj]

Dealship called today and said the #6 cylinder was not firing. Planning on changing the injector and see what happens. #8 cylinder is off by 3% on compression checked by scan tool.

 

[yellowjeepcj]

Got the truck back today> Replaced # 6 injector, new serpentine belt, oil and filter change, transmission service and filter change. $1000 later running fine.