Extended Idle Hours

[Cinnabunn]

Hi y’all. I have a 2015 F-350 srw crew cab (pictured below) that I drive for hotshot. I sleep in it as well. So I run at idle for extended periods of time. I have looked at quite a few of different forums and I cannot seem to find a straight answer for exactly what my pickup has recently been doing. I have a full DPF and EGR delete done with sct x4 tuner with no issues what so ever and I change the tunes often between towing and regular driving. My pickup was not recently deleted either, so I don’t think that would contribute to the problem unless I just didn’t notice it for a year. Recently (the last couple of days) after 5+ hours of idle time (granted there could have been 8 - 9 hours of hard driving done before that) my pickup will start to emit small amounts of white smoke, constantly out of the tailpipe. My first thought was low coolant, but my coolant levels are fine. The engine and oil temps do not show any sign of even coming close to running hot and I have no way currently to check my exhaust temp, but from what I can gather even non-deleted 2nd gen F-series diesels have had no problem with extended idling. They just emit smoke when you drive them till it can burn off or regen if it needs to. Mine however doesn’t do this either. Any ideas? Thank you in advance!

 

[Blackcoyote]

I would recheck your tuning for deleted PDF. If I recall correctly, when the 15s go into Regen mode, they dump a little extra fuel into the system and slightly elongate the time the valves are open to allow more heat into the exaughst to help increase temps when burning off the particulates. I'm sure an expert might chime in, my first step would be to make sure your not still dumping fuel into the cylinders. From my turbo IDI days, White/blueish smoke = unburned fuel. Let us know how it turns out!

 

[Cinnabunn]

Well it’s been deleted for a little over a year I would think it would have started doing it sooner if it was a tuner issue. But I will look into it thank you!

 

[01yellerCobra]

White is coolant. So it would be fuel. I wonder if its building up condensation from the long idle times?

Did you check both cooling systems? Make sure it's not coming from the intercooler.

 

[Cinnabunn]

White is coolant. So it would be fuel. I wonder if its building up condensation from the long idle times?

Did you check both cooling systems? Make sure it's not coming from the intercooler.

Coolant from the inter cooler? That would be a major issue if there’s coolant coming from the turbo!

 

[01yellerCobra]

Coolant from the inter cooler? That would be a major issue if there’s coolant coming from the turbo!

I'm not totally sure how these things are set up. But I know with the Cobras sometimes the o-rings connecting the intercooler go bad or the intercooler itself cracks and leaks into the intake. It'll blow white smoke sometimes and cause the coolant level for the intercooler to drop.