Question Asked: confused / check engine
April 26, 2011, 07:43 AM
1999 V6 4X4 rodeo with 150,000 miles , never had any trouble until now , low fuel pressure ( lean ) O2 sensors . had fuel pump replaced , Twice ( 35 lbs pressure at idle . O2 sensors replaced . still shows , lean , O2 sensor ( check engine still on ) $1200.00 later . any suggestions on how to fix ?
at idle the regulated fuel pressur is 35 , pull the vacume line off the regulator and the pressure increases to 48 - 52 . and the shop I had do the work , pulled the codes , I don't think they have the full diagnostic equip . / they pulled a code of lean / low fuel pressure , changed the pump , same code , changed it again , then O2 sensors , looked for vacume leaks . and give it back , and are stumped