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Thread: Brutally hard start after reflash - COS3

  1. #11
    Joe (Moderator) joecar's Avatar
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    If it loses trims it should still not be hard to start...

    Is there another OS/COS that you can run on that PCM....?

  2. #12
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    Quote Originally Posted by joecar View Post
    If it loses trims it should still not be hard to start...

    Is there another OS/COS that you can run on that PCM....?
    I'd have to look but I'm sure there is the problem is I have had this problem with other operating systems and pcms before as well. I will look and see what other os I can run in cos3.

  3. #13
    Joe (Moderator) joecar's Avatar
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    Also, compare your tune file to a known good tune (e.g. stock tune), look at the startup and idle tables.

  4. #14
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    I've done that, it's not an issue with that because after the initial hard start it will start up great forever until you unhook the battery or flash a tune.

  5. #15
    Junior Member Dewglass's Avatar
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    If it's any consolation I have always had these symptoms with COS3/ V1. It will also do it when the battery is disconnected/reconnected?

    Just thought this was normal "re-learning" of the PCM?
    '02 S10 Xtreme 4.3 Syclone power; AWD, 4L60E; 411 PCM: Walbro 255; 160F thermo: Front coil overs, 4" static drop;

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