Runniung weird
Senior User
Joined: Jan 2004
Posts: 419
Likes: 0
From: Macomb, IL
Now what did I do with those keys?
Senior User
Joined: Jul 2007
Posts: 432
Likes: 0
From: Germantown, MD
Did you try a coolant temperature sensor? If the sensor is falsely telling the computer it's -40* the computer dumps gobs of fuel to compensate. That will give you the black smoke, big time.
Senior User
Joined: Jul 2007
Posts: 432
Likes: 0
From: Germantown, MD
No, I mean the coolant temperature sensor. If the temperature sensor is stuck sending a voltage signal to the computer indicating -40*, the computer thinks the engine and surrounding air are -40*. The computer makes a really rich mixture to compensate. Even when the engine warms up, the faulty sensor can still be sending the -40* signal.
When my truck had the rich problem very similar to what you describe, I actually changed the coolant temperature sensor. Turns out it was the fuel pressure regulator in my case, but either of the two components could create a similar rich effect.
When my truck had the rich problem very similar to what you describe, I actually changed the coolant temperature sensor. Turns out it was the fuel pressure regulator in my case, but either of the two components could create a similar rich effect.
Fleet Mechanic
Joined: Apr 2008
Posts: 1,724
Likes: 2
From: Vancouver BC Canada
How did you test the fuel pressure? Did you check it while running? A weak fuel pump can sometimes provide enough fuel to idle or run under light throttle, but starve out when you give it more gas. BTDT
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New User
Joined: Oct 2009
Posts: 17
Likes: 0
Coolant sensor didnt work. The fuel was checked with a fuel pressure gauge. Good pressure all the time. Owner is going to get the control module and computer off a different truck and we will see if that works. If not, has to be in the wiring.
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Senior User
Joined: Dec 2007
Posts: 294
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From: Noblesville,IN
Mine did that kind of thing. I finally took it to a mechanic and he found that I must've dropped the sparkplug in #7 and then put it in with the electrode bent totally closed gap. Somewhere you have a dead miss. You need to find it. Maybe you have a bad valve, maybe a dead plug or spark plug wire.Check that the wires are actually snapped on at both ends. Ford distributor caps are nicer than the parts house ones but I see no difference in the rotor.
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New User
Joined: Oct 2009
Posts: 17
Likes: 0
Mine did that kind of thing. I finally took it to a mechanic and he found that I must've dropped the sparkplug in #7 and then put it in with the electrode bent totally closed gap. Somewhere you have a dead miss. You need to find it. Maybe you have a bad valve, maybe a dead plug or spark plug wire.Check that the wires are actually snapped on at both ends. Ford distributor caps are nicer than the parts house ones but I see no difference in the rotor.
Senior User
Joined: Jul 2007
Posts: 432
Likes: 0
From: Germantown, MD
Have you used a B.O.B. (Break Out Box)? I used one on my truck recently. It plugs in between the computer and 60 computer connector. It allows you to pin out all 60 pins with the engine running. It's really helpful and useful. I discovered that my O2 sensor was stuck reading .030V in and out of the computer.
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