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Truck smokes at idle until warm

  #1  
Old 12-26-2018, 04:22 PM
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Truck smokes at idle until warm

I'm trying to decide if it's the tuner dumping in extra fuel, or just because the truck is deleted. It seems like when it's cold out (less than 40degF lets say) and i fire it up, the smell and sight of unburnt fuel will nearly burn your eyes if you're next to the tail pipe. I just did load the stock tune back into it, but it's not that cold today. Is that kind of smoke typcial with the 6.4? My first winter with this truck, so i'm still learning.
 
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Old 12-26-2018, 07:08 PM
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How many miles are on the engine?
 
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Old 12-26-2018, 08:00 PM
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50k

As I said I turned it down to stock and I had somewhere to go this evening. It's noticable less smoke and smell. Fuel mileage indication from the lie o meter is way up as well. Something about cold weather and the tuner don't mix.
 
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Old 12-26-2018, 08:19 PM
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Nope not typical, stuck injector comes to mind. How wet does the tailpipe look? Does it blow smoke when decelerating?
 
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Old 12-26-2018, 08:31 PM
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I haven't noticed the tail pipe being wet. But my fender and bumper are more covered than normal. With today being better, I feel better about it being the tune. Still doesn't sound normal. I'll reach out to Patriot about it.
 
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Old 12-28-2018, 12:13 PM
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Just a tech bulletin for you to review.

White – Blue smoke at idle when cold

****Diagnosing smoke related issues on trucks equipped with diesel particulate filters may require temporarily disconnecting the filter or installing a test pipe to see the smoke.

If the smoke clears in less than 1 minute, this could be normal depending on temperature and altitude. Blue white smoke that burns your eyes is un-burnt fuel; cold temperatures, high altitude and excessive idle time all mean cold combustion and white smoke.
  1. Possible bad injector, use the scan tool to cancel one cylinder at a time and see if the smoke clears up. However, using the scan tool to kill the injector does not reduce rail pressure in the injector and the tip can still leak fuel, cap off lines one at a time to pinpoint injector. Also look at the fuel trims, if the tip is leaking fuel then the fuel trims may be out of specification. Try increasing the rail pressure, we find injector nozzles that leak at idle pressure, but do not leak at higher pressure. Buy 6.4 Powerstroke Injectors
  2. Check glow plug operation when cold.
  3. Check engine compression. It is always a good idea to check compression on these engines prior to replacing injectors. Low compression may present like bad injectors and cause a misdiagnosis.
  4. Excessive idle time can cause white smoke when cold due to carbon build up on injector tips. More than 20% idle time is excessive. If the injectors have excessive carbon on the nozzle tip then balance rates should be high on that cylinder.
  5. An EGR cooler that is leaking internally can cause white coolant smoke, often after sitting overnight or for several hours during the day. Coolant smoke will smell sweet and not burn your eyes like fuel smoke.
 


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