Re: Pulled bed to change fuel pump and missing piece of rubber.
Lean means too much air and not enough fuel measured by the upstream o2 sensors. This could mean you have unmetered air (vacuum leak) or insufficient fuel volume typically caused by low pressure). Check fuel pressure and look for leaks in the airflow path past the mass airflow sensor.
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Rick Large
Mesa AZ
'99 Ex-Ranger 2wd XLT 5.0, Explorer V8 and auto transmission swap, floor shifter from Nissan Altima Parts, aluminum radiator & electric fan, OBX headers, 3" custom exhaust, explorer roof rack, 2006 mirrors, cut front 60/40 seat to buckets, 4 in lift spindles up front and shackles in back
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