2003 Ford Expedition Error code too rich bank 1 and 2 plus

2003 FORD EXPEDITION
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DMHUFF92127
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Engine Performance problem
2003 Ford Expedition V8 Two Wheel Drive Automatic 110K miles

Fuel pump most likely? I cant find the test port on this thing to check but have heard it could be the pump. I would like to know before shelling out $$. I have cleared the error several times and it comes back within a day. On a full tank it starts quick almost every time. After that, hard start (3-5 sec). Also seems to be a bit more pinging when cold and going up hill. This has been going on for over a year and was really just an annoyance but now 1st smog is due so its time to deal with it. PLEASE HELP. Thank you very much.
Jul 30, 2009 at 11:41 AM
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RASMATAZ
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2003 Ford Expedition Error code too rich bank 1 and 2 plus

Running rich:

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.
Jul 30, 2009 at 11:44 AM
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DMHUFF92127
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So I see you don't even list the fuel pump as a possible cause. Should I check those other items first? Air flow and filter checks out ok. I will move on to O2 sensor and fuel pressure regulator and then the coolant sensor. Thanks.
Jul 30, 2009 at 12:06 PM
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