running rich

[scoobroo]

Hey guys, i have a 98 gt BD 2.5 5spd. It has been running really rich for a while and i cant figure out what is causing it. I already replaced the fuel filter, plugs and wires, air intake, front 02 sensor and header. I tried sea foam but had no luck. I am going to run a diagnostic on it tonight. Any suggestions?? Thanks

[Huffer]

How do you know it's running REALLY rich? Most Subaru's run rich stock.

If you are basing it off your MPG, most Subarus won't get more than 28-30mpg freeway.

If your MPG is suffering, are your wheels & tires at the right pressure, aligned properly and wearing correctly?

Also, very aggressive tread (sticky rubber) will result in lower MPG because it increases the friction between road and car.

[scoobroo]

for one thing the mpg does suck , and i mean bad, like 10 mpg. And i can also hear it back firing almost everytime i shift. The exhaust also smells real rich. Everything is aligned and correct. Maybe my cats are clogged or somthing

[steven_esworthy]

Any check engine lights? The PCV system can cause a rich condition, I dont know if it would make it that bad tho. I found this website, might help you http://www.asashop.org/autoinc/JULY/TECH2TEC.HTM Good luck!