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1994 Ford F-250 Runs Rich

Tiny
MEHBOOB
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  • 1994 FORD F-250
Engine Mechanical problem
1994 Ford F250 V8 Two Wheel Drive Manual

My ford f250 with a 460 runs rich. I have replaced the o2 sensor TPS and map sensors. Cap rotor plugs and wires. It is blowing black smoke, a lot of it. Is there something I may be missing or something else I could try in order to fix this problem?
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Friday, January 8th, 2010 AT 2:49 PM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Running on the rich side

Possible causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.
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Friday, January 8th, 2010 AT 2:57 PM
Tiny
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I have replaced the o2 sensor, IAC TPS and MAP sensors. I will replace the tep sensor and see how it goes
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Friday, January 8th, 2010 AT 5:55 PM
Tiny
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Best check the fuel pressure before you do that
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Friday, January 8th, 2010 AT 5:57 PM
Tiny
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Could it be possible for all 8 injectors to be leaking? What are the odds of that? The reason for asking is because all 8 sparkplugs were black full of carbon
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Friday, January 8th, 2010 AT 6:26 PM
Tiny
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Check the fuel pressure end of conversion and get back with me
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Friday, January 8th, 2010 AT 6:28 PM
Tiny
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I have checked the fuel pressure and its good. I also replaced the fuel pressure regulator, and the coolent temp sensor. Still burning way to much gas. Could it be possible that I have to reset the computer? If so how do I do that?
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Saturday, January 9th, 2010 AT 2:42 PM
Tiny
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Your injector/s could be leaking
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Saturday, January 9th, 2010 AT 4:22 PM

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