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Old 04-03-2013, 03:02 AM   #1
bugeye212
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Default 2002 impreza misfire codes

Engine misfiring with little to no power behind the engine with misfiring at idle and runs like garbage. I thought it was the fuel system and replaced the pump with a walbro, and fuel filter at the same time, next replaced the plugs which helped for a few days and replaced the coil pack with a new one from autozone but did not help and returned it. The problem remained intermittent and got worse with a few days of time. Then I replaced the map sensor, yet no luck. Just purchased a OBD-II system reader from harbor freight instead of wheeling her into the dealer hoping I can find and fix the problem cheaper after buying my own scanner, and if not I got a scanner for next time I need to clear some codes or read CEL lights.. Throwing code P0172 which reads fuel bank 1 running too rich. Fuel SYS1 is stuck in CL. short term fuel trim anywhere from -18.6% to -20.04% Long term fuel trim -14.1% to -25%. Also getting a steady 0.000 volts from O2B1S2 and steady over 2V from O2B1S1. O2 sensors giving false readings? Vacuum leak somewhere on intake? Leaky injectors? Any input would be helpful or what is common on these cars.
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Old 04-03-2013, 11:05 AM   #2
bugeye212
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Any ideas anyone?
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Old 04-03-2013, 05:05 PM   #3
mod maniac
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What are the mods? Is the stock uppipe still on with the cat? do you still have the stock exhaust with cats? How many miles are on the car?
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Old 04-04-2013, 05:56 PM   #4
bugeye212
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125K miles. No mods all stock with a K&N. Car is from California, emission standards stock exhaust I think there are two cats on the exhaust
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Old 04-05-2013, 01:23 PM   #5
mod maniac
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The uppipe has a cat and that needs to go first. If that isn't your problem I would check the rest of the cats.


(I have been corrected no turbo my mistake) thanks Charlie

Last edited by mod maniac; 04-06-2013 at 03:56 PM.
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Old 04-06-2013, 04:03 AM   #6
Bababou
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Check for exhaust leaks. My buddys 02 was showing the same codes, after he finally got several exhaust leaks taken care of the codes cleared.
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Old 04-06-2013, 08:29 AM   #7
Charlie-III
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1-Why the comments regarding an up-pipe?? This is a NA section, thus no turbo!!
2-When was the last tune-up (plugs, wires, etc)? What was used (brand/type) for the tune-up?
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Old 04-09-2013, 10:25 AM   #8
mod maniac
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Quote:
Originally Posted by Charlie-III View Post
1-Why the comments regarding an up-pipe?? This is a NA section, thus no turbo!!
2-When was the last tune-up (plugs, wires, etc)? What was used (brand/type) for the tune-up?

It still sounds like cat problem.
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