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Ported Stock MAF

This is a discussion on Ported Stock MAF within the Computer & Tuning forums, part of the LSx Technical Help Section category; I just installed a slp air lid and ported the maf and when i floored the car the service engine ...

  1. #1
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    white
    1998 Trans Am a4

    Ported Stock MAF

    I just installed a slp air lid and ported the maf and when i floored the car the service engine light came on. What are these codes and will they hurt my car if i drive it and performance wise?
    It threw these codes:
    po1404
    po151
    po131
    po157

  2. #2
    Just me Y2KPewterSS's Avatar
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    Pewter metallic
    2000 Camaro SS

    http://obdii.com/codes.asp

    You can use the link above to check your trouble codes. Porting the stock MAF was a bad idea.

  3. #3
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    1998 Trans Am a4

    Why is it a bad idea?

  4. #4
    NY Representative basballny2's Avatar
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    Red
    2001 ws6

    because the stock MAF works fine, once u start going with aftermarket MAF's and porting the stock you need to re-tune the car and it can cause all kinds of trouble.

  5. #5
    Moderator 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    Stocker is good as-is for applications up to 500 or so HP.

  6. #6
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    white
    1998 Trans Am a4

    Thanks and is it ok if i just de-screen one?

  7. #7
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    no. leave the stock MAF alone

  8. #8
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    Black & Blue
    '02 WS.6 / '07 Suburban

    Any modification to the MAF throws off the fueling. All sorts of people will tell you that they have done this and that to their MAF and their car runs fine. Quoting Greg Banish, a noted GM tuner, modifying the MAF can alter your fueling by as much as 13% if I recall correctly. Essentially, the PCM is interpreting the data from the MAF based upon a known flow calibration. When you alter the flow by de-blading, de-screening or porting the MAF you throw off the calibration.

  9. #9
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    silver
    2000 formula

    is it running richer or leaner?? seems my car has always run rich....even after the maf mod......kn filter..and LT's......when the money train rolls in.....getting a tune

  10. #10
    Just me Y2KPewterSS's Avatar
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    Porting the MAF leans it out. Adding long tubes makes it richer.

  11. #11
    Moderator Firebirdjones's Avatar
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    I have a stock MAF on one, and the other has ported ends that bolt to the stock housing.
    The stock MAF was easy to tune. The other car took a bit of tuning in the MAF tables to get it decent.

    If you really really wanted to play with the MAF, rather than removing screens, and grinding on the housing and possibly ruining it,,,,,I'd personally just bolt on the ported ends that come without the screens.
    If you don't like it or you have problems, it's easy to switch it back to stock ends. Either way, tuning is needed.

    I thought the ported ends were still available?? Maybe not.

  12. #12
    Member 98Hardtop's Avatar
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    black
    1998 Camaro Z/28

    Like it has been said. Leave the stock one alone unless you know exactly what you are doing and why.

    09 Vulcan 900 custom.
    2007 Subaru Legacy 2.5i
    1998 Z/28 Hardtop A4 | Y2K wheels | SLP Lid | Magnaflow catback |cutout | Hotchkis LCA'S/PHB | BMR TA and D/S Loop| Tuned by Frost....300rwhp/308rwtq

    97 Cobra- bolt ons | full exhaust| 4.30's| suspension | SCT tune- sold!

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