Hey guys. In the past couple months maybe 3 times my truck would stumble when taking off from a light. It sort of felt like it had no power but it was only for a second if that then the truck would take off like normal. I had never noticed any sort of smoke when this happens because it happens so quick. Well tonight while driving home it did the same stumble when taking off from a light but this time it felt like it was twice as long as any previous time and this time I happened to look in my mirror and saw a puff of black smoke. Just wondering if somebody has had this same issue and knows what it might be? There is no check engine lights but I am going to check for codes with my SCT tomorrow morning. I know it isnt the greatest for checking codes but its all ive got.

Also I have about 2000 KM's on oil, oil and fuel filters. All ford filter with Rotella 15W40 oil. EGR valve was also cleaned about 2000 KM's ago with new o rings and gasket. The egr valve wasnt wet or anything when I pulled it and it actually looked pretty good.

 

First thing I was going to suggest when I saw the title of the thread was pulling and cleaning the EGR valve. Sometimes they can catch a chunk of carbon and stick. Has it had the old gearloose "italian tuneup" lately?

 

id pull the egr valve and clean it.also check and make sure the seals arnt cut.you also need to have a koeo test ran so the computer nows where fully open and fully closed positions are.

 

Ill start by pulling the egr valve and giving it another cleaning. Now that I think about it immediately after cleaning the egr valve last time I was driving the truck with the SRL tune on for awhile. The truck has been returned to stock for a couple months and its only done this stumble and black smoke while stock.

Im wondering if since the egr valve is shut off with the tune maybe some carbon built up on the valve while it was always closed due to the tune and now that the valve is operating maybe some of that built of carbon is inhibiting the valves movement.