2006 Subaru Impreza WRX Seafoam Experiment
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This is a discussion on 2006 Subaru Impreza WRX Seafoam Experiment within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hi All, So I had noticed recently that my 2006 WRX was idling a little rough when it first started ...

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    Registered User nbrittain28's Avatar
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    2006 Subaru Impreza WRX Seafoam Experiment

    Hi All,

    So I had noticed recently that my 2006 WRX was idling a little rough when it first started up and every couple of seconds little white puffs of smoke would come out of the exhaust. I decided to try using Seafoam for in the gas tank and BPV vacuum line. After reading multiple posts, I decided not to put it in the crankcase. Adding to the gas tank was easy (long-neck funnel). I disconnected the hose from the BPV and slowly poured 1/3 of the Seafoam into it and it sputtered a lot as I expected. I read in multiple posts that you are supposed to pour a good dose in at the end to stall the car. I let it set for about 15 minutes and started her up. A good amount of white smoke came out. The car seemed to idle a lot better and run smoother.

    After driving it around for about 5 miles the CEL came on and the Cruise Control light started flashing. The Cruise Control also wasn't working. The car was running fine but I immediately drove back home and shut it off. I started it up again and the CEL and Cruise Control were still on. I disconnected the battery to reset the ECU and the CEL and Cruise Control went away and the car drove fine. My question is...did I do permanent damage by stalling out the car? After the issues arose I did some research online and read in a few places that you can damage your O2 sensors and spark plugs by dumping too much Seafoam in at once and intentionally stalling the car.
    -Nick

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    You did indeed hit the O2 sensor with some of the Seafoam to get a CEL. If you had a Cobb AccessPort or reader you could have seen exactly the error code was. The cruise control will cancel out when you get the emissions related CEL so once you cleared the CEL the cruise control resume normally again.

    I would take the car on a really hot exhaust ride and see if you did any permanent damage to the sensor. If you do get the CEL again they chances are you did corrupt the sensor(s). You will need a diagnostic check to see which one is bad, but they aren't too expensive to replace if you did. On the bright side you car is running much better

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    Registered User nbrittain28's Avatar
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    Thanks for the info. I was hoping it would more likely be the sensor than the plugs. Cobb AP is next on my list and I am definitely excited to have the code-reader functionality.
    -Nick

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