I keep getting an 0171 code (Running too lean). This truck has the
2.7, 4wd, 95,000 miles and a fairly new O2 sensor. The code lights up under heavy throttle when going up a hill. I have an air/fuel ratio meter attached to the O2 sensor. The A/F meter does not read lean when the code lights up. I think I have seen it read extreme rich as the CEL comes on.
Another thing I have noticed. When coming to a stop the engine will initially idle at 1000 rpm and then drop down to about 800 after a few seconds. This truck is new to me so I am not sure if this idle behavior is normal. Thanks.
Tom