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  1. #11 Re: Cat code question. 
    GT Level Member UCF04GPGTPCompG's Avatar
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    As far as the spark plug non fouler, basically it's just a metal tube which I thread into the exhaust pipe O2 hole, then thread in the O2 sensor on the other end right? Are there different lengths or what? I get the P0420 code after getting a Magnaflow Cat & 3'' Downpipe. Was wondering if maybe this could help a little. I'm trying to do a few small things before I have to bring it into a shop to figure out my high rpm misfiring and small idling issues. I'm going to try to seafoam first to see if that helps at all and find any leaks if there are any.

    I looked up the downstream, it's an 18mm. So will this work? http://shop.advanceautoparts.com/web...on+fouler+18mm

    Also, I'm getting code P0036 (Heated Oxygen Sensor, Heater Control, Circuit Bank 1, Sensor 2) I tested the heater resistance and it was about 8 Ohms. From what I read up on, that is about right. Any suggestions?

    As far as the seafoam goes, I can just use the brake booster vacuum hose line for adding in the Seafoam slowly while someone holds the gas down aroun 2500rpms right? Then shut it off and leave it alone for 10~15min then start up again?


    Quote Originally Posted by nik12937 View Post
    Just put your 2nd O2 in a spark plug non fouler or two to extend it away from the exhaust pipe. It will trick it into thinking a cat is lowering emissions since not all of the exhaust fumes are hitting the sensor anymore. It works for high flow cats, I'm not sure about straight pipes though.

    Cheap alternative to an O2 emulator, especially on 04+ GP's where emulators throw codes.
    Last edited by UCF04GPGTPCompG; 04-18-2013 at 09:44 PM.
    2004 Pontiac Grand Prix GTP Competition Group (250K)
    Engine Mods: K&N Air Intake, ZZP 3'' Downpipe w/MagnaFlow Cat
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