Subaru Problems? Ask a Mechanic for Answers ASAP
Does this vehicle have an alarm Factory or aftermarket? This sounds to be an alarm issue, It starts and runs for a couple seconds and then dies, Factory and many aftermarket alarm cancel out the electrial signal to the fuel injectors when it thinks it is started incorrectly, If you key is bad it will do this with a factory alarm, If factory alarm try a different key (key that came with vehicle, it is encoded) Also try opening and closing all doors, and then locking then from outside driver door wait 10 mins and the unlook outside drivers door and insert key into ignition and try starting, Tahnks, Please let me know if I can be of anyother assistance to you with this issue
Have you checked to see if there is a vacuum leak from one of the vac. hoses (this will cause it to run rough at idle speeds and die out) many times it take a bit before any codes will log in the pcm on these years (like lean codes etc. )
Do you have a scan tool that can see the live data inputs from the O2 sensors?Was anything done to the car prior to this happening?
One the under side of the duct work from the air filter to the throttle is a 3/4 inch hose. Make sure this hose is connected. I am not sure if a smoke test would pick this hose out and since it's underneath it does get missed time to time. This actually is exactly how the car will run with it off.
I would like to know the fuel trims if possible, both long term and short term.
Is the car a manual or auto?
Take the front O2 sensor right out of the exhaust pipe and see if it helps. You may be dealing with a plugged converter. Removing the sensor will give the exhaust a place to go.
Are their any codes with this?
Unplugging the maf makes no difference on this?
Ok, so the maf has influence here for sure then.
The shielded wire is the signal wire, I believe the other wire should be the power wire.
If you have a meter, check the voltage out at the sensor white wire, then back at the ecm and see if the reading is the same at both ends of the wire.
Also, check the ground wire on the maf for continuity to ground I have seen this fail on these.
I would say the maf is causing the issue or the wiring. I know you replaced the maf, but it seems to be a clue for us.
Sorry for the delay,
I am showing 5 wires on the maf sensor not 3. Can you give me the wire colors on the maf?
What is the voltage on the shielded wire?
Sorry, I am showing this is a 4 wire sensor and one wire, yellow at position 2 on the connector should be the ground. It is grounded at the ecm, but it's also the ground for several other components.