Thread: 02 works when it wants to

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  1. #1 02 works when it wants to 
    Donating Users gtpsleeper's Avatar
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    Alright bros Im at a loss here....

    Been dialing the car in and the last few days Ive been doing the usual city driving, cruise, etc... and randomly today my trims decided to go crazy. They were pegging +16.4 (give or take) and thought "damnit, vac leak". So I figured Id go home and check it out no big deal. On the way home they started acting normal again and Im just kinda like "the fuk?" and didnt worry about it....

    So today I get ready to do some WOT stuff and they start freaking out again. I have a scan but cant remember how to put it on here but basically, it all looks fine when I start out but just randomly my 02's quit cycling and just peg at ~940 or so (like it is in PE mode) and stay there, driving my FT's through the roof no matter what kind of driving Im doing. Then for no reason at all it seems, it starts cycling and my trims level out to normal again.

    Ive tried doing a hard reset (unplugged the battery for 30 minutes) and swapped now 2 02 sensors only to keep seeing this. I also checked the wiring and cant seem to find a problem. Before I start really getting into my wiring, I want to make sure Im not missing anything here as far as what to check?

    Im running in open loop now and just doing my WOT with my wideband so it isnt messing with anything anymore but I would like to figure this out if I can. If not, I can just do open loop for the time being.

    Wondering if anyone has any input.

    Jarred
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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  2. #2 Re: 02 works when it wants to 
    GrandPrix Junkie SgtMarshal's Avatar
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    I wonder if the cat is going out and its doing the cat diagnostic. I don't remember for sure if that made the trims go rich or lean. it could also be an exhaust leak.
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  3. #3 Re: 02 works when it wants to 
    Donating Users gtpsleeper's Avatar
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    If it is an exhaust leak it is tiny because I cant hear it at all...

    I dont have a cat and the diagnostics are all disabled in the tune.
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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