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Thread: ARC2 help (with logs, problem possibly unrelated to ARC2)

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    Forum User verified Feedback Score 4 (100%) Frostedbutts's Avatar
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    ARC2 help (with logs, problem possibly unrelated to ARC2)

    I've been having an issue with my car running like a piece of shit. My fuel setup is:

    Hotwired Walbro
    Denso 720cc
    AEM FPR
    ARC2 w/ 87mm MAS

    Low -5
    Mid -7
    High -6
    Accel +3
    (this setup was posted by Hellbringer on 3si, who had roughly the same mods)


    The first problem I'm having is that my ARM1 ALWAYS reads the second to last lean light. I've already tried adjusting the low knob everywhere from -5 to +5/6 and the ARM1 refuses to dither. My o2 voltages change for a minute or so on my logger and then go back to sticking at certain numbers, after the car warmed up this most recent time I started it, it was:

    Rear o2: .80-.95
    Front o2: stuck at .99

    ARM1 reading lean as always and idle at ~800. Which is odd because those o2 voltages are rich as hell, right? It shouldn't even be running if it's reading constantly that rich. The weird part is that this area of the log is where the car runs best.


    When I first started the car it was:

    rear o2: .03-.06
    front o2: .11-.15

    ARM1 reading lean. Idle ~1000.


    Eventually after it warms up the idle smooths out for a bit and then it slowly dies. Vacuum is reading -50~ hkpa at idle.

    Log here:
    https://spreadsheets.google.com/ccc?...zMUI5S1E&hl=en

    https://spreadsheets.google.com/ccc?...VeFJ1REE&hl=en
    Last edited by Frostedbutts; 04-11-2011 at 03:25 AM.

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    Member Not Verified Feedback Score 7 (100%) mb3000's Avatar
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    Log please

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    Bullet proof

    Not trying to be mean spirited but I thought these things were supposse to be so easy to tune, for almost 1k they should be. I was thinking of getting one but now I don't know.

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    Forum User verified Feedback Score 4 (100%) Frostedbutts's Avatar
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    As stated in the title, it is possible that this problem is unrelated to the ARC2.

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    Banned Feedback Score 11 (100%) J. Fast's Avatar
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    Something is going on with the rear bank or O2 Trev. Pull the sensor out and test it with some brake cleaner on a rag and see if the voltage changes. If it stays pegged it's toast. Since I know you already changed the plugs and wires, if it's good do a boost leak test and then a fuel pressure test. Then do a compression test on the rear bank.

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    I sure hope so. Maybe try calling DNP as someone there is an expert on these. GL
    Last edited by 1gRick; 04-11-2011 at 02:46 PM.

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    Forum User verified Feedback Score 4 (100%) Frostedbutts's Avatar
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    Quote Originally Posted by J. Fast View Post
    Something is going on with the rear bank or O2 Trev. Pull the sensor out and test it with some brake cleaner on a rag and see if the voltage changes. If it stays pegged it's toast. Since I know you already changed the plugs and wires, if it's good do a boost leak test and then a fuel pressure test. Then do a compression test on the rear bank.
    Cool, I'll grab a sensor from my other car and try one of those as a replacement. How hard is this thing to change without the "special socket" from mitsubishi?

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    Member Not Verified Feedback Score 7 (100%) mb3000's Avatar
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    You can get the special socket from autozone or a similar store. IIRC it's a 7/8".

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    Diamonds and Rust Feedback Score 1 (100%) gltasn's Avatar
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    my vac at idle is -18, my arc2 #'s are +2,-7,-3,+1(felt clicks not, dot style indicators.) ive got 720's with the big mas,dual wallys, and 2 steps colder plugs.
    "if i was as slow as you, they'ed bury me" dad

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