Says upstream oxy sensor is not acting correctly not dead not shorted but something
I agree fuel is acting on and off, thats why I tryed the fuel filter first, service at subaru says fuel air mixture sensor which may be the O2 sensor could be the culprit, there was lots of back pressure in the fuel line to the injector when I did the filter, how much I'm not sure, but it sprayed back against my thumb 4 a bit seemed pretty good. Oh at 80mph and above it seems to steady out and run smooth, so fuel obviously can get to the engine in quantity at some times, gotta be something acting on the pcm it would seem, I was going to try to blow air under pressure back thru the fuel line to see if there was any obstruction but that doesnt seem to be the case now.
Thing is the o2 sensor has been giving a mil on and off for a year or so, we just run it hot for an hour or so and the light would go out for a few days or a week damn thing iis 180 bux, doesnt the pcm just go to a default less efficient setting when this happens? It never did this surging bucking starviing for fuel action before, like I said I added methyl alcohol to absorb any water and auto zone sold her a can of gas treatment to work thru the injector. Any thing else you can think of?
Thursday, March 19th, 2009 AT 5:23 AM