What are these engine codes?

[outwheelin]

I finally got my check engine light codes read by autozone. I have two codes. They are code 171 and code 174. Do any of you know what is causing these 2 codes, and what I need to fix, so the stupid light will stop coming on?

[frostie]

You can do a search on this forum for p0171 and p0174. Basically, these codes indicate a lean condition, probably due to a vacuum leak. Most of us are finding that this requires the "isolator bolt fix".

[wiswind]

Isolator bolt fix is for 1999 and newer windstars.
You will find great information at this link....
http://leckemby.net/windstar/windstar01.html

For 1998 and older, it is still almost always caused by a vaccum leak.
These engines use a different upper intake manifold, and does not have the issues with the isolator bolts and coming apart.
Look for a loose or damaged vaccum line.

[outwheelin]

Thank you for the info.