When first start up sounds okay, the longer it runs it gets worse to a point like a misfire, it will also start sputtering and lose power, then all of a sudden it will just take off again and run with power but still missing, then start sputtering again. Have replace plugs twice, wires, all are tight. Ran codes they said that misfire on cyclinder #1, bank 1 and 2 are too lean, and exhaust gas recirculation not enough, I am sure all are related. Any ideas and help appreciated.
Replace the EGR unit
put a can of injector cleaner in the tank
check the cat converter for blocking the exhaust system
SOURCE: 1995 Ford Bronco 172 EGO not switching lean bank1- jerks when run
Have u checked for vacuum leaks or poss leaking EGR valve? use carb spray around the upper intake manifold where it bolts to the lower manifold, spray vacuum lines where they are connected to the engine vacuum ports, the idle speed will change if u hit a leak, as far as the EGR valve goes see if it gets hot at idle, if it does it is leaking, if all checks ok replace the O2 sensor, but i suspect u will find a leak at the upper intake plenum.
SOURCE: Ford Windstar 1996 Trouble Codes P0171, P0141, P0161, and P0174
Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.
SOURCE: location of O2 sensor in bank 2, 99 5.4 expedition, running lean
I have a ford 2003 windstar that was running very rough when cold and almost stalling. engine light came on. went to autozone and they read the codes for free and told me it was running lean on Bank 2 also. i came home searched for the O2 front sensors online using the info autozone gave me. there are 2 front sensors on my car that need to be replaced at the same time. look for ones that have a direct plug in and don't need wire splicing. the ones without the wiring harness are cheaper but more of a pain, i think.
they were fairly easy to replace. getting access with the wrench was the worst. reset the light by disconnecting the battery for a few minutes. seems fine now and the light hasn't come back on.
SOURCE: 2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced
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