EGR Headaches
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Junior User
Joined: Feb 2001
Posts: 94
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EGR Headaches
Im having trouble with the EGR on my 93 F150 w/ 5.0. I pulled the codes and there wasnt any hard faults. But the Continuous Memory Codes were 41, 31, 32, and 33. The check engine light comes on about every time I drive it but it never stays on steady. Ive tested the sensor on top the EGR and checked to make sure the Valve is stuck and thats ok. Does anybody have an idea?
Senior User
Joined: Jan 2001
Posts: 142
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EGR Headaches
Your codes indicate the following:
Code 31: EGR Valve control sensor fault
Code 32: EGR pressure feedback fault (shouldn't apply to your year or engine!)
Code 33: EGR Valve fault
Code 41: Oxygen sensor signal fault, switching not detected.
Based on this information I would say that the valve is clogged with carbon or exhaust deposits and should be cleaned. Take it off and soak it (or spray it) with a good combustion chamber cleaner (oxygen sensor safe though). My own truck used to do this on the highway. Run good for 30 miles and then get a flickering Check Engine light (especially coasting after climbing a hill). I've cleaned the valve while it was on the engine just by spraying in the ports along the side of it and also by taking the sensor contacts and cleaning them (carefully). No more codes or flickering light! Hope it works for you. Otherwise could need a valve. Cheers.
kw
Code 31: EGR Valve control sensor fault
Code 32: EGR pressure feedback fault (shouldn't apply to your year or engine!)
Code 33: EGR Valve fault
Code 41: Oxygen sensor signal fault, switching not detected.
Based on this information I would say that the valve is clogged with carbon or exhaust deposits and should be cleaned. Take it off and soak it (or spray it) with a good combustion chamber cleaner (oxygen sensor safe though). My own truck used to do this on the highway. Run good for 30 miles and then get a flickering Check Engine light (especially coasting after climbing a hill). I've cleaned the valve while it was on the engine just by spraying in the ports along the side of it and also by taking the sensor contacts and cleaning them (carefully). No more codes or flickering light! Hope it works for you. Otherwise could need a valve. Cheers.
kw
