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Old 01-16-2007, 11:01 PM   #1
Scooby Newbie
Member#: 91381
Join Date: Jul 2005
Chapter/Region: SCIC
Location: northridge, CA
2004 STi wingless

Default Check Engine light is always on

Hey everyone,

I have an '01 2.5RS and my check engine light is always on. When I take the car to get smog'd, it says there is a misfire on cylinder 4 but I have taken the car to 4 dealerships and they all tell me they can't find anything wrong with the car and that there is nothing that can be done. I was hoping someone on here might have some helpfull info because I need to get this light off so the car can get smog'd. Thanks alot.
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Old 01-17-2007, 09:36 AM   #2
Scooby Specialist
Member#: 12344
Join Date: Nov 2001
Chapter/Region: MAIC
Location: Mountains of Maryland
2002 2JC


Don't you hate it when "experts" just give up?

Have you disconnected the negative terminal of the battery and let it sit that way overnight. The next morning reconnect the the terminal, and do the hands off feet off basic start and warm up procedure. Maybe the cel will go away.

If not, you can request testing, or replacing, the spark plugs and associated wires. I don't know much about the RS ignition though.
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Old 01-17-2007, 06:18 PM   #3
Scooby Newbie
Member#: 116636
Join Date: Jun 2006
Chapter/Region: MWSOC
Location: ohio
2003 impreza


try a coil pack and wires ive had to actually replace 3 pcms cause of somthing similar
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Old 01-18-2007, 05:59 PM   #4
Scooby Specialist
Member#: 33868
Join Date: Mar 2003
Location: Chesterfield, MO
2003 wrx


Does this car have a wasted spark ignition? (1 coil per 2 cylinders) If so I doubt the spark would be bad in just one cylinder and I'm sure one of the experts changed the plugs.

You aren't losing any coolant are you? Where I'm going here is head gasket leak causing intermittent misfire (by intermittent I mean more than once per 3 drive cycles)

Did they look at fuel trim and see if there was excess oxygen or excess hydrocarbons in the exhaust? Where I'm going here is a bad fuel injector.

I take it the car runs/idles fine? A subaru dealership should have known all these issues so you may.......
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