hesitation + fuel smoke

[po-po 5.0]

I was pulling my little 5x10 utilty trailer today, and notice that if I stood on it from about a 35 mph roll the truck would immediately lay over, I'd hose the next lane with fuel smoke, and then finally the truck would start moving (and the smoke would go away) This doesn't happen with a heavy trailer, it doesn't happen empty. Any idea whats going on?

[dale75]

My truck did the same thing. I took it into the dealer and they said the EGR valve was bad. It has been in the shop for 4 days. I guess the egr valves are on back order and they hope to get one in by the end of the week.

[rdc]

Originally Posted by po-po 5.0

I was pulling my little 5x10 utilty trailer today, and notice that if I stood on it from about a 35 mph roll the truck would immediately lay over, I'd hose the next lane with fuel smoke, and then finally the truck would start moving (and the smoke would go away) This doesn't happen with a heavy trailer, it doesn't happen empty. Any idea whats going on?

I've had a similar experience a few times (don't know about the smoke).
Coasting to a traffic light, light turns green, lay into the throttle from
a rolling start (15 - 20 MPH) and nothing for several seconds, then
WHAM! it goes all at once.

I'll have to do some experimenting now, and see if it needs to go in
for a 'checkup' while it's under warranty.

[po-po 5.0]

Originally Posted by dale75

My truck did the same thing. I took it into the dealer and they said the EGR valve was bad. It has been in the shop for 4 days. I guess the egr valves are on back order and they hope to get one in by the end of the week.

Interesting. Not sure how the EGR can cause this, but its worth looking into.

[firemansdiesel]

If the EGR is not working properly then the cylinder pressures temps are too low causing loss of power and smoke. Could be something else. good luck!

[Harley350]

My truck reacts the same way and has since new and apparently my dealer does not have the intelligence to figure it out after 5 attempts because it still does the same thing.

[po-po 5.0]

After much searching I found that there is a TSB that deals EXACTLY with what I'm experiencing: hesitation with fuel smoke only during acceleration after a long steady cruise, and only on a damp/wet day. I will post the TSB number and info tomorrow, but apparently the fix is an upgraded intercooler

[po-po 5.0]

TSB 08-25-1

White smoke in damp weather conditions when accelerating; trucks built before Oct 1, 2008

Concern is described as significant amounts of white smoke from the exhaust pipe.
White smoke only occurs in high humidity or rainy conditions above 40 °F (4 °C).
White smoke only appears during a moderate to heavy tip-in that is performed after a period of steady state driving (approximately 20 minutes)
No diagnostic trouble codes (DTCs) are present.
Concern is not a result of regeneration, a cleaning exhaust filter event.

If all of the criteria above is true, then replace the Charge Air Cooler Assembly with a new revised part

7C3Z-6K775-B

[Harley350]

Thanks for the info. I will show the TSB to my dealer and see what they say. Funny how I learn more from this site then from the dealer. I'm going to suggest they become a member here so they can learn how to fix our trucks.

[po-po 5.0]

Originally Posted by Harley350

Thanks for the info. I will show the TSB to my dealer and see what they say. Funny how I learn more from this site then from the dealer. I'm going to suggest they become a member here so they can learn how to fix our trucks.

Either that, or they need a better way to search through their TSB database.