apexi Posted October 31, 2018 Share Posted October 31, 2018 (edited) I tried to make this easy to read and easy to follow, but I think it's probably the opposite of that.. I'm a newb with fuel system stuff... legit ocd for a long time, I just don't touch fuel system stuff, kind of like a lot of electrical stuff in my house, with exceptions. trying to figure out what's causing some small issues I'm having with my non-turbo legacy. Long story short.. -The attached picture is not from my car. -Does the orientation of these round "dampers" matter? My top one is right side up like in the picture, but the bottom one is sideways, so that the bottom is facing the driver side fender. -The bottom hose going from the engine to the damper was replaced with napa h175 1/4" fuel line. Could that cause any issues? -Does the bottom line only take vapors back to the fuel tank or charcoal canister? Or does it carry fuel? -My car has two of those round "dampers", one on top, one on bottom, just like the picture. I'm guessing one of those is the FPR, but I don't know which one, and why there are two.. Current issues -When I left off the gas pedal, the car is a little jerky sometimes. -When I'm driving down the road and shift into neutral when coming to a stop, sometimes the idle will dip down low to around 400 before it bounces back up to the normal range of around 800-900 or so. -Sometimes when I'm just stopped and idling, the car idles perfectly smooth, but the rpms will blip up on its own. I forget how long it happens for, but it's abnormal. -Also when shifting, the car just feels a little abnormal, shifting is a little less clean, I think it's because I'm letting off the throttle, and the car can be slightly jerky when I do that. A little more info... -3 or 4 weeks ago I'm driving down the road, car randomly starts jerking a lot, throws a cel. I pull over, pull the code, p0172 for one of the banks running rich. -I'm able to get home, the car stops jerking, but I have to give the car more throttle when starting in 1st so that it doesn't stall. -FSM says check intake leaks, check exhaust leaks, check maf sensor, and fuel pressure. - I doubt it's a dirty maf, I've cleaned that a few times this year with maf sensor cleaner. After almost 230k, I buy a new oem Subaru maf sensor thinking maybe it's bad. Car drives better, don't have to rev high in 1st to start and stuff. -upstream o2 is a year old NTK sensor. This problem happens with that sensor, and my old OEM sensor which is still good, I just got rid of it a year ago because I thought it's why I was getting 20-22mpg, when really it was a dirty maf causing that. -Could a leak before the upstream o2 sensor cause this, leaking exhaust manifold gaskets? -throttle body is clean -trying to make my own diy smoke machine to do a smoke test, but can't find a suitable smoke source yet -ecu has been reset multiple times. battery and alternator test good. -spark plugs look good, wires test within spec for resistance, coil pack tests within spec for resistance. I don't know if they could still have an issue? coolant temp sensor seems fine using my cheap obd2 reader Edited November 7, 2018 by apexi updated thread title Link to comment Share on other sites More sharing options...
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!Register a new account
Already have an account? Sign in here.Sign In Now