threw some codes after oil change

[stonegod85]

so i changed my oil 4 days ago. i went with castrol syntec vs. going with the usual synthetic blend. everything was just as smooth as usual, but now i threw two codes P0172 and P0175 (system is running rich on both banks). i don't get how this is possible. but 2 days ago i filled up with the usual 93octane from the 76, and i noticed my stang start having hickups. could this just be some bad gas? i haven't changed out the copper plugs i have for a little over a year now and it's probly time to do that again too, but not sure if that has anything to do with it. any help would be awesome guys.

thanks,
Gus

 

[DTNODYA]

I'd inspect plugs and wires.

Bad gas sucks too, kinda hard to tell if that's it (especially when it is so expensive)

Fuel filter replacement if you haven't in a while.

It is probably coincidental that you changed your oil and it runs odd. More than likely un-related. IMO.

 

[stonegod85]

that's what i was thinking too....paid more money to help it run smoother and gets ALOT more rough! fuel system was cleaned a year ago and i only put 93 in it so i doubt i need to change the filter or clean the injectors again.

 

[sgarlic]

Well, since changing your oil shouldn't theoretically have any effect on the fuel system, I would say it's coincidence. Eliminating other things like contaminating the MAF, or accidentally tearing an o2 sensor wire, I would think bad gas could be a definate possibility.

 

[stonegod85]

yeah....i'm thinking bad gas as well. i know for a fact the MAF isn't dirty nor did i touch the o2 sensor wires. i'll fill up with some BP or Exxon next time!