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Old 12-17-2013
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I am: Doug
Join Date: Dec 2013
Location: Alvin, TX
Vehicle: 1998 Ranger XLT
Drive Type: 4x4
Engine: 4.0
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Icon8 Check Engine Light Code 171 & 174

Ok I am new here so try to be patient with me.
I have a 98 Ford Ranger 4X4 4.0 with 146K miles on it. Overall the truck still runs great but about a month ago the check engine light came on and can not find the source of the problem. Lean on both banks and everything points to a vacuum leak. These are the things that I have done so far:
1) Changed all three O2 sensors, (then found out that this would not be the issue)
2) Cleaned the MAF sensor
3) Used starting fluid to spray around the intake as well as all of the vacuum hoses.
I am sure that performing a smoke test would be more accurate but have not found a place to rent one, buying one for a $1000 bucks is not an option.

I could really use some help here
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Old 12-17-2013
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I am: Josh Vickroy
Join Date: Dec 2008
Location: Logan ohio
Vehicle: 2005 Ford Ranger
Posts: 2,772
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DO a search should be a ton of info on it.. Idle air control, mass air would be common causes.
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