1994 Ford Ranger w/4.0l. Runs rough at idle code 153 and the O2 sensor on left bank not switching. Also shows rich on scan tool. Mass air seems to check out(voltage is good). No vacuum leaks I can find. Replaced O2. Did not fix. Checked for vacuum leaks, MAF sensor, fuel pressure, fuel pressure regulator. All check good.
Thursday, April 5th, 2012 AT 8:23 PM