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Thread: Added Maggy 2300 and car is super lean at idle.

  1. #1
    Tuner
    Join Date
    Aug 2016
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    SE WI
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    Added Maggy 2300 and car is super lean at idle.

    STFT goes to 25+ since Maggy install.. If left idling, I get CEL for both banks lean. Fueling cleans up after rpms/mph comes up.

    Maggy was pro-installed by long time Vet Tech.

    I installed stock tune and got same results.

    I am fairly new to LT4 tuning. Appreciate any suggestions.Attachment 108687

  2. #2
    Senior Tuner Ben Charles's Avatar
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    Aug 2009
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    I bet it’s a vac leak somewhere, changing from a stock size MAF tube and just a blower change won’t need a 30% increase in fuel at idle.

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  3. #3
    Tuner in Training
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    May 2020
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    Mn
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    Agreed with vacuum leak. I'm a long time GM tech and I installed one of these a couple months ago. Torqued manifold bolts to spec twice and used blue loctite. Checked every vacuum line as idle was lean. Tightened the bolts again-just snugged tight no torque wrench and rechecked. Good to go. Was sucking a small amount of air through the intake gaskets. The lean idle showed up after a couple test drives. Always check the basics before you go down a rabbit hole.

  4. #4
    Tuner
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    Aug 2016
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    SE WI
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    Found leak. Snout on 2300 has a hole on top to support a clamp for wiring or plumbing. My 2300 had the hole drilled through into air stream. Tech found it by forcing smoke through intake system. A little sealant and a bolt fixed my problem..