Subaru 2.5 misfire

30

Asked by Jan 12, 2017 at 08:00 PM about the 1996 Subaru Legacy 4 Dr Outback AWD Wagon

Question type: Maintenance & Repair

Been working on my girlfriends 1996
subaru legacy outback with the 2.5.
Original code was a injector cyl#1
open. Ran fine before this by the way.
I replaced the injector,  it ran awesome
for like half a day.
Now, the car is pinging, cutting out it
won't accelerate. Coasting or going
slow it feels like it loses fuel.
Today I just replace the pvc, tubes, fuel
filter. And it still will not accelerate.
Missing, spitting, sputtering, pinging.

13 Answers

79,005

Possible causes, Faulty spark plug (s). Faulty ignition coil (s), Clogged or faulty fuel injector (s), Intake air leak, Fuel injectors harness is open or shorted, Fuel Injectors circuit poor electrical connection, Ignition coils harness is open or shorted, Ignition coils circuit poor electrical connection, Insufficient cylinder compression, Incorrect fuel pressure.... Start by checking for intake leaks, intake gaskets are common caused of misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem.

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Best Answer Mark helpful
30

After I posted my question, I found a small vacuum hose off. Reconnected it. Runs a lot better. Still slight hesitation and slight miss

95,825

Pinging can simply mean that you need a higher octane gasoline. My 2003 Forester ran way better with 89 octane gas in it, my 2015 Forester also pings on regular. In my experience Subaru's don't' run all that great on regular.

30

Well darn it....drove into Portland and it starting cutting out, missing. Check engine light flashing now on steady. Rough idle. Gonna scan it and see what code it threw.

2 of 2 people found this helpful.
95,825

I suspect you need new spark plugs and maybe wires too.

30

Po400 egr flow Po301 cyl 1 misfire Po420 catalyst system efficiency below threshold bank 1

30

Po400 egr flow Po301 cyl 1 misfire Po420 catalyst system efficiency below threshold bank 1

79,005

P0301 SUBARU - Cylinder 1 Misfire Detected... Possible causes Faulty spark plug 1 Clogged or faulty fuel injector 1 Faulty ignition coil 1 Fuel injector 1 harness is open or shorted Fuel injector 1 circuit poor electrical connection Ignition coil 1 harness is open or shorted Ignition coil 1 circuit poor electrical connection Insufficient cylinder 1 compression Incorrect fuel pressure Intake air leak.....P0400 SUBARU - Exhaust Gas Recirculation Flow.... Possible causes Exhaust Gas Recirculation (EGR) volume control valve stuck closed Faulty Exhaust Gas Recirculation (EGR) volume control solenoid valve Faulty EGR Valve Faulty EGR temperature sensor and circuit Exhaust Gas Recirculation (EGR) solenoid valve harness is open or shorted Exhaust Gas Recirculation (EGR) solenoid valve circuit poor electrical connection Dead (Weak) battery....P0420 SUBARU - Catalyst System Efficiency Below Threshold.... Possible causes Three way catalyst converter Bank 1 Exhaust tube Intake air leaks Fuel injectors may be faulty Fuel injector leaks Spark plugs may be faulty Improper ignition timing Engine Control Module (ECM)... As the code description implies the P0420 code means that the vehicle's control module has detected that the three-way catalytic converter is not working properly (is not as efficient as the factory is expecting). Replacing the oxygen (O2) sensors may sometimes fix the code, but in most cases the catalytic convert needs to be replaced to fix the problem. If the P0420 code is combined with other codes, try fixing the other codes first.

1 of 1 people found this helpful.
30

Thank you, will give the others a try

30

#1 plug was shot, the gap was like .90 and the wire had a big slice in it

1 of 1 people found this helpful.
79,005

Glad you found it....

30

Yeah me too! I just wish I had smaller hands lol, absolutely no room.

95,825

Thanks for the feedback!

1 of 1 people found this helpful.

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