MAF junk? Please help!
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This is a discussion on MAF junk? Please help! within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; I have a 02 WRX and been having major lean issues with it. When I drive it, its only like ...

  1. #1
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    MAF junk? Please help!

    I have a 02 WRX and been having major lean issues with it. When I drive it, its only like i got 1/4 throttle. After 3500 rpms and starts boosting it jumps really lean. It will also start detonating on higher rpms. I have changed the fuel pump, fuel filter, O2 sensor, and plugs. I also put the stock airbox and BOV back on to see if that would help. No help.

    Well i logged what i could with my scanner(i know it isn't much). Here are the stats:

    TPS% - 100
    Eng Speed - 5009
    Calc load - 67.9
    Maf flow - 124.85 g/s
    MAP kpa - 162
    Iat deg. - 73
    IGN advance - 9.0

    This was the highest of my run due to traffic..

    Can anyone say for certain that is the problem.. I am pretty certain that is the problem. Would just like to know for sure

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  3. #2
    Master Baiter EJ257's Avatar
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    Have you cleaned the MAF sensor?

    Any leaks?
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

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    Yes, i have cleaned it.. twice actually. Just to make sure i didn't leave anything behind.

    And i searched everything that i could see, and i haven't found any leaks..

  5. #4
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by mrbledsoe08
    And i searched everything that i could see, and i haven't found any leaks..
    Visual inspection isn't sufficient. Have you tested for leaks?
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

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    No.. Not actually. I just read about the propane testing. If that would be sufficient, I will try it tomorrow. Gonna give anything a shot.

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    Well, after further investigation.. i noticed that my turbo inlet hose has about a 1 inch tear in it. So i guess i am going to try a Perrin intake tube. I will install it and reset the ecu and see what happens. I will post back shortly

  8. #7
    Moderator   Sasquatch's Avatar
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    PM sent - I may be of some help turbo inlet hose-wise.
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