1996 Tacoma 250,000 mi.
Rough Idle- P0303 Cyl 3 miss fire.
Adjusted valves- #3 was a zero lash- brought to spec.
Cleared codes- Good drivibility several hundred miles, now P0303 is back along w/ Cat eff. below threshold.
Vehicle runs ok in open loop, but when sensors come on line data is such:
AFR- 20:1 at idle
+ 19% long term FT
Injector resistance measured out at 15.4 Ohms- spec is 14.2 max- Cyl 1 inj. measured out at 15.2.
AFR is very lean, ECU is Calling for lots of fuel. Maybe fuel press is low?