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Thread: Car will not idle...

  1. #11
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    I'm no expert but here's what I see.

    I'm guessing your IAT really isn't -39*C.

    There's nothing coming from the MAF?

    Your o2 sensors are reading 900+. They ought to be around 450-500mv when you aren't under boost.

    Manifold kpa look high intermittently. Maybe a vacuum leak somewhere?

  2. #12
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    Jul 2011
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    Car is SD...no maf
    also naturally aspirated...converted to COS3 to make for a easy tune .....
    I dont know about the IAT...need to check that
    Im really just trying to get it to idle so I can run the VE tune ....that will take care of the O2s and mixture

    thank you

  3. #13
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    I thought maybe you were boosted based on the big assed injectors. But I see you have a 402. What are they, 65 lbs/hr?

    Anyhow, you're dumping fuel at it because your VE table is way too high around idle. Here's my 6.3, 11.2 CR, Fast 92, Street Sweeper HT, AFR 205 for reference.

  4. #14
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    Jul 2011
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    COS3timingmap_0001.tun
    Car idles better however under a load or just reving up engine timing is severly reduced and runs horribly...timing in the negatives...what could be pulling that much timing?...I cant figure it out. Speed density 427 DBW COS3

  5. #15
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    Your ve table looks very fat do you have a wideband on this car that you can watch while driving? Most of the time on an na car you ve table will never go over 100 maybe 101-104 that is about all i have ever seen. part throttle around 60-85 depending on auto of manual and converter size
    David McLain
    www.etdrag.com

  6. #16
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    -39 IAT.... could be IAT sensor not connected which will cause a rich condition.

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