running lean
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Freshman User
Joined: Aug 2006
Posts: 35
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running lean
ive got a 1997 explorer 4.0 auto i keep getting code po174 and po171 the book says the engine is running lean i keep deleting them but they come right back the car seems to run ok which sensors do i need to check any ideas thanks alot
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
Lean codes on both banks typically indicate a major intake or vacuum leak, but can also indicate a dirty MAf sensor. The best course of action is to clean the MAF sensor, and then replace any questionable vacuum lines. The intake manifolds gaskets are a common failure, so if there are no vacuum leaks and the MAF isn't the cause, the intake manifold gaskets will need to be replaced.
Cargo Master
Joined: Aug 2003
Posts: 3,263
Likes: 92
From: BC Canada
Ditto Bear's advice, have had a couple leak by the FI O-rings, so check them and if you do the intake manifold gaskets , replace the O-rings.
I ended up making a smoke machine for the last leaker (couldn't locate leak)
I ended up making a smoke machine for the last leaker (couldn't locate leak)
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