So I had some problems at Superlift this weekend.
Problem is thus....
After a cold soak the truck will start right up and seem to be fine. If revved there will be a small amount of hesitation right as you get into the throttle. If the engine is warmed up the hesitation on throttle up gets way more pronounced. If the engine is shut off, restarting is a pain. 30-45 seconds of cranking with the pedal to the floor just to get it fired. Must hold 50% throttle until it evens out otherwise it will just die. The truck will run down the highway just fine and seems to have plenty of power, the problems rears its head when you attempt to get on the throttle from an idle (stop sign, etc). It's way more pronounced when you're in 4L and pointed up a 60 degree climb Also it is spitting black junk out of the tailpipe, especially after a hard restart.
The following was swapped in the parking lot at Superlift with no appreciable effect.
-TPS
-Coil
-Plugs
-Fuel filter
The fuel pump was replaced two weeks ago for a different problem. I threw a fuel pressure gauge on it today and it was reading about 40 under load even while hesitating and failing to start.
Any ideas?
Problem is thus....
After a cold soak the truck will start right up and seem to be fine. If revved there will be a small amount of hesitation right as you get into the throttle. If the engine is warmed up the hesitation on throttle up gets way more pronounced. If the engine is shut off, restarting is a pain. 30-45 seconds of cranking with the pedal to the floor just to get it fired. Must hold 50% throttle until it evens out otherwise it will just die. The truck will run down the highway just fine and seems to have plenty of power, the problems rears its head when you attempt to get on the throttle from an idle (stop sign, etc). It's way more pronounced when you're in 4L and pointed up a 60 degree climb Also it is spitting black junk out of the tailpipe, especially after a hard restart.
The following was swapped in the parking lot at Superlift with no appreciable effect.
-TPS
-Coil
-Plugs
-Fuel filter
The fuel pump was replaced two weeks ago for a different problem. I threw a fuel pressure gauge on it today and it was reading about 40 under load even while hesitating and failing to start.
Any ideas?