Blue smoke & rough idle at startup then OK????

[ckbones]

Have 2002 Excursion with 142k miles. Just recently a problem started and it seems to be getting worse. When I start up the Ex blue smoke comes out of exhaust pipe and it idles rough. After a few minutes it clears up and runs like nothing happened. Recently after startup it has stalled after running a minute or trying to move and it took about 3 - 10 second cranks to restart and a large cloud was coming out of tail pipe. It cleared up after that and ran like nothing happened. I was 400 miles from home and once she started I didn't shut it off for 8+ hours.

What has me puzzled is she is not burning any oil or smoking when it is running fine.

I google the blue smoke and it says oil, but I'm not consuming oil and not smoking going 70 mph on the freeway.



Could this be something electrical with any of sensors that the Ex has? I'm puzzled. Appreciate all the help and advice offered. Thank you very much.

 

[6.0 Tech]

Sounds like the injectors are worn out. Or have some bad o rings in them


Sent from my iPhone using Tapatalk

 

[DEEZUZ]

7.3. Cold start over night sit, let her idle 5-10 seconds then stab it full throttle, if it breaks up in the powerband and struggles to reach redline, smokes terrible, 9/10 injectors.

 

[NotThatGuy]

Please excuse the late reply....
Regarding sensors, I would unplug the IPC before attempting to start the truck and check that the nut on the back of the IPR is tight. If the nut was tight, and unplugging the IPC sensor clears up the idle and smoke issue, then the IPC sensor is probably bad.

Regarding injector "o" rings... Does your fuel filter look black after a short interval ? If so the injector "o" rings may be bad, but I doubt that is causing your stalling issues.

With only 142,000 miles I would not expect the injectors as a first thought. Unless you have been running your tank dry or the truck has bad fuel pressure.

Regards.

 

[DEEZUZ]

Not 1 time, but 3 times... 3 times....

 

[NotThatGuy]

3 times ? I'll try and keep my truck away from yours so it does not learn this bad habit

I was not saying it could not happen, just that it would not be the first place I would look. Maybe I am a bit sensitive to the "It is the injectors" comment because 80% of the time when I ask a shop about an engine issue they say I need new injectors. When that is not the issue. IMO there are so many other (less expensive) things to check before replacing injectors.