Thread: Cat code question.

be 100% certain you dont have a leak cus i didnt think i did and couldnt figure out my **** mileage (7-9mpg) i threw some seafoam in it and seen it was leaking at the crossover and i couldnt hear it or see it otherwise. so i fixed that leak and did the spark plug non fouler trick on the rear o2 and now im getting 16-19 all city driving stop and go traffic
btw seafoam works wonders i run it every 3-4 months. last week my brother in laws camry was running like ****, idle was at like 1800 rpm abd just ran like ass, we tried changing everything to get the rpms down and no luck. we had got a couple bottles of seafoam when buying parts for ****s and giggle and as soon as i ran it threw 1/2 a bottle in the intake the thing dropped idle and started purring like a kitten

also what are your mods and what are you running for plugs tstat ect...

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?

Originally Posted by nik12937

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.