Welcome to Ultimate Subaru Message Board, my lurker friend!
|Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.
We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!
Serving the Subaru Community since May 18th, 1998!
dtc p0170 fuel trim
Posted 19 January 2011 - 06:22 PM
Seen multiple threads on replacing O2 sensors and air flow meters, here and other forums. Have replaced both, and fuel trim remains at or above +25% short term and long term. Intake and exhaust systems intact and no faults noted. Recalls and campaigns all taken care of. O2 sensor voltage front and rear read 0.000V most of the time. MAP, air flow, timing, and other parameters close to comparable vehicles. Car drives good most of the time when trim is high. Starts to run bad at idle when trim slowly climbs to 25 or 30, then switches to 0.0% and stays at 0.0%. Occasionally will have performance issues while driving, but not very often.
Looking for any answers or thoughts, no matter how far reaching they may be...
Posted 20 January 2011 - 01:08 AM
I have seen:
Fuel Pump/Pressure Problem
Dirty Air Flow Meter
Disconnected air box.
2 Air filters installed on vehicle. Only the small box to the passenger side is to have one. Not the one behind the throttle body. Spacer belongs here. If you have an air filter that is cut to allow air thru this gap get the dealer part ($55-70) last I checked. Yes I have seen cars where people tried to make do with an air filter rubber seal instead.
Posted 20 January 2011 - 01:17 AM
0 user(s) are reading this topic
0 members, 0 guests, 0 anonymous users