EJ22T running rich, O2 sensor wires & error codes in all 4 injectors

[s'ko]

I am trying to track down a problem on an EJ22T.

 

I originally had a bad throttle position sensor (TPS) It would run ok, but it was rich.

 

While messing around with the car, I accidently broke off the knock sensor wire at the plug. I stuck a thick wire into the plug and twisted the sensor wire as a temporary fix. Engine then started to run ridiculously rich. Burning my eyes with the exhaust and it would not rev over 2000rpms. I was also not building any boost b/c the wastegate was open and it would just go down the exhaust. Got two additional error codes the bypass idle air control solenoid and the pressure sensor and pressure exchange solenoid valve. I was not sure what was happening so I tried adjusting the bypass air control solenoid. I am pretty sure I put it back in the right position

 

Later I went to the junkyard and picked up working TPS and a knock sensor plug. I put in the TPS and the error light went away. I re-wired the knock sensor and shielded the entire wire and the knock error went away. I start the car and it still runs rough. At this time there was no CEL.

 

Later I get codes for all 4 injectors. Right now it will run and idle rough and I can rev it past 2000rpms and I get boost. But it’s still running really rich. Kinda stumped. I left the car w/the battery unplug today and when I get home from work I will hook it up to see if it will start.

One other question, I have a bosch universal O2 sensor with three wires one black, two white. From what I have read, the black wire is the signal wire and the two white wires are the heated wires. Anyone have any idea how to connected it to the Subaru wires? From what I read in the FSM, the white wire is the signal wire for the ECU and the black white is heated ground and the yellow red is heated power. Does it not matter how the two heated wires are connected as long as they complete a circuit?

 

Would a incorrectly wired O2 sensor case it to run really rich?

 

Anyone have any idea what else could cause all 4 injectors to throw error codes?

 

Thanks

 

BW

[nipper]

Step 1, throw away the universal O2 sensor, and get a OE O2 sensor, that may be part if not all of your problem. Yes an incorrectly wired sensor can even blow the ecu depending how poorly its wired. There are reasons it has three wires.

 

 

The front sensor should always be OE, the rear can be universal.

 

Step 2, Stop breaking things.

 

 

nipper

[Gloyale]

Step 1, throw away the universal O2 sensor, and get a OE O2 sensor, that may be part if not all of your problem. Yes an incorrectly wired sensor can even blow the ecu depending how poorly its wired. There are reasons it has three wires.

 

 

The front sensor should always be OE, the rear can be universal.

 

I can't say it's a bad idea to use OE, but I don't think it is you're problem here.

 

Have you tested you're fuel pressure?? Perhaps you're regulator has failed and you are getting full pump pressure to the injectors? Shot in the dark:rolleyes:

[Reveeen]

I have a Bosch universal O2 sensor

 

The correct Bosch # is 13255, inside the box is a made in Japan part # F00E260032 (in a plastic bag).

 

Running rich:

As far as I'm concerned these cars do run a little rich, but not excessively, as was mentioned: fuel regulator, but first take a look at the MAF, and it's wiring. If enough crap got past the stock fuel filter the regulator will not be working right. The stock fuel filter does seem to provide some, well, I won't call it pressure regulation, but I will call it pressure stabilization.

 

(there is also a small vacuum line that comes off the manifold, standing at the front looking in, left side front, that has to be connected, or all kind of weirdness goes on)

[s'ko]

Went to my car after work and i connected the negative terminal to the battery. Took the O2 sensor and wired it up correctly and fired it up.

 

it runs now. Not great but it will rev past 2k and it's building boost and it's not running rich. Took if got a spin and there is a slight hesitation at around 2k and then it pulls hard and takes off. Boost is building at around 4k or so. the EJ22T w/the 3.7 RX tranny is a beautiful thing. I have yet to take off in low range, but I can't wait.

 

I will get a OEM o2 sensor later. money is a bit tight right now.

 

BW