I have a 1999 Ford ranger 4.0L EFI 4Wd
Here is the a link to the values I was receiving with a OBD scanner . I got trouble codes PO171 and 174 running lean on banks 1 and 2. I have recently in the past few months change MAF sensor, 2 O2 sensors, fuel filter and air filter and spark plugs. I even tried checking for a vacuum leak by spraying carburetor cleaner around the engine to see if it idles higher. But I can't seem to find a vacuum leak. Thanks for your help.


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