Join Date: Apr 2010
Location: Boulder County
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black smoke when warm
I am at a loss...anyone have any ides on why my truck is blowing black smoke after it warms up?
Its a 2004 F250 (late build) with 170K on it.... The only major mods are a K&N air intake, and exhaust.
The problem started awhile back with shuddering on the highway along with white and black smoke. I was getting numerous EGR codes, FICM code, injector #1 code and an underboost code. Injector 1 failed the buzz test, all others passed.
I ended up replacing injector #1, replaced the EGR cooler, threw in a new oil cooler while I was in there, replaced the EGR valve, cleaned the EBP sensor and tube, new oil (rotella T5)and oil filter-with rev-x, changed both fuel filters, and new coolant. I put it all back together and it started up and ran great.... The black smoke still didn't stop... it smokes under normal acceleration and pre-boost. Once the boost gets to about 5-6 psi, the smoke stops and it clears out.
I hooked back up and pulled the damn FICM code again...all the other codes were gone... I replaced the FICM.
Hooked up to the trailer (about 5K) and pulled it for about 20 minutes to see how it went... truck pulled like normal, no noticeable loss of power, however there was no hills or mountains I went up, but the truck is still smoking black after it gets to normal operating temp and seems to get worse as the engine gets warmer or the load gets heavier.
Now I have no codes, no CEL, injectors all passed a buzz test, cylinder contribution test checked out ok, FICM volts are showing within range.
I am out of ideas... anyone at all have any ideas as to what could be going on?