both banks too lean
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Elder User
Joined: Aug 2009
Posts: 869
Likes: 1
From: Michigan
both banks too lean
my work van (not mine I just drive it) has the check engine lt lit. so i pulled the codes there were 3 EGR flow which cleared. but 2 that wont clear are bank 1 too lean and bank 2 too lean. so whats leaning it out? any ideas? the first thing that comes to mind is fuel pressure. pump? filter? it does have 130K+ miles on it.
New User
Joined: Aug 2008
Posts: 1
Likes: 0
My Expedition did the same thing last month. It started when I pulled off the highway one night and the engine started surging and stalling and almost died at a stoplight. It ran fine above 1000 rpm but at idle would barely run. After a lot of digging around I found the large vacuum line at the back of the throttle body had an elbow that had collapsed and torn. I replaced it and everythning went back to normal.
