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Old 12-23-2011, 09:53 PM   #1
pskelly
Scooby Newbie
 
Member#: 302587
Join Date: Nov 2011
Chapter/Region: South East
Location: Orlando, Florida
Vehicle:
2004 WRX STi
Blue

Default CEL troubleshooting

Hello all,
I recently purchased a 2004 wrx sti. It has a COBB Sri, Invidia down pipe, RSR cat back(with stock cat) and some sort of heavy duty clutch. I know this is going to sound like a horror story but I am doing my best to make the best of it and your help and advice would be greatly beneficial. I purchased this car from Maryland and had it shipped to Florida where I live. I was told that it was stock and all of the pictures showed it stock looking. As previously stated it is not...A stock looking muffler was fitted to the rear axel and the RSR piece was in the trunk. When the car got to me it had a CEL for the bank 1 O2 sensor not responding. So I replaced this and had an oil change and it was good for about a week. Next I got 3 for cylinders 1,2,3 misfires. So I changed all 4 plugs and it was good for about a week. Today I got the stock looking muffler lopped off and the RSR piece put back on and not 3 hours later I got 3 CELs. Cylinders 1 and 2 misfire and a pending code for cylinder 3. At no point during my ownership of this car has it idled rough, sputtered, knocked, been erratic or driven poorly in any perceivable way. I had a mechanic at Subaru, mechanic at the place who did my muffler, and my friend who owns a 300whp GSX drive my car for 20+ minutes each at different times and none of them said anything negative about how it felt or sounded.

I am posting this in hopes of ideas, experiences or suggestions of what this could be, what i should do test/replace, or any general advice.

Thanks in advance,
Patrick
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Old 12-24-2011, 12:18 AM   #2
Uncle Scotty
Scooby Guru
 
Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

take it to mastro and have them look at it....
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Old 12-24-2011, 08:32 AM   #3
pskelly
Scooby Newbie
 
Member#: 302587
Join Date: Nov 2011
Chapter/Region: South East
Location: Orlando, Florida
Vehicle:
2004 WRX STi
Blue

Default

I took my car to Sport Subaru to do the O2 sensor so Id probably go there because they are closer. If this is an issue that has to do with my modifications do you think a dealer can help? For instance if the car is running lean. Or do you think its something else?
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Old 12-24-2011, 09:20 AM   #4
pskelly
Scooby Newbie
 
Member#: 302587
Join Date: Nov 2011
Chapter/Region: South East
Location: Orlando, Florida
Vehicle:
2004 WRX STi
Blue

Default

I forgot to mention that the car has 50,2xx miles on it. I also did find a COBB access port manual in the glovebox. No access port though. >.<
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Old 12-24-2011, 02:55 PM   #5
Uncle Scotty
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Member#: 16200
Join Date: Mar 2002
Vehicle:
OK Houston
we have an Uncle

Default

OK...the car likely needs a tune.....that intake may be causing the issue

have a compression test done
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