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Old 02-11-2019, 05:52 PM   #1
Scooby Specialist
Member#: 191557
Join Date: Oct 2008
Chapter/Region: TXIC
Location: Rockwall-East DFW
2004 WRX Wagon
WRB not so minty fresh

Default P0171 was on going, now after several intake related mods, P0190 and P1086 thoughts?


Short version: had a significant fuel leak in one of the OE hardlines under the intake. I have had most all of Stage 2-3+ parts waiting for free time, so the car got tired of waiting and made me dig in.

While I had the intake off, I did everything I would be doing "for fun and upgrades" while I was in there.

New Mods done just last week.

Installed PnP TGV deletes
(when I had them done I intentionally left the shafts in so I could do these and eventually program the codes away. the shafts will represent zero restriction for my set up. The shafts are NOT a problem )

Re-installed Hard APS turbo inlet

All new silicone Turbo & TMIC hoses

Installed complete -6 parallel fuel line set up:

Torque Performance fuel rails
-6 AN nylon fuel lines to the OE hard lines
100 micron summit fuel filter
Custom distribution blocks with a fuel pressure guage on the return side
Radium Engineering Stock FPR adapter reused stock FPR
Walbro 255 GSS342
Swapped a set of cleaned and flowed stock injectors, unmodifed

Replaced all the worn out emissions hoses for the crank and PVC system with Emissions rated barrier type hose. Custom Air/oil Separator system going in this week.

1 step colder NGK PLatinum plugs

With all that said.

I HAD P1086 which is the TGV position sensor was installed 90* out of whack on the driver's side TGV. flipped it and that code is gone. Which is great and all the other weird random misfire and lean codes went away as well. Also to note only the on going P0171 code was saying a "hard code" others were "Possible Pending Codes" but was tripping the CEL

Now all are gone and I am getting P0191 which is Fuel pressure rail pressure circuit ref voltage nto in range.

I am sitting at 34-36psi at idle. I cannot see the mechanical gauge while driving.

Does the Subaru system maintain pressure in the system when you shut the car off? When I first put pressure to the new parallel system, the pressure came right up to 38psi and stayed, even overnight, only dropping down to 29-30, but I did not start the engine. After starting and running th car, which runs seemingly fine, the pressure immidately drops to ZERo as soon as you turn off the key.


Thanks in advance.

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Last edited by TXwrxWagon; 02-11-2019 at 06:20 PM.
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