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Thread: Checking and cleaning MAF sensors

  1. #181
    Patrol God Avo's Avatar
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    Quote Originally Posted by Zero Five View Post
    Do i have to Unplugged the battery first before i remove the maf sensor to be cleaned? or i have to remove the maf sensor first and clean it then before putting it back in thats the time i have to unplugged the battery? thanks
    Yes mate all ya have to do is disconnect battery for 30 odd minutes before refitting dry maf..

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    Watch this space, as there maybe a comment added soon

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    MB (27th June 2019)

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  4. #182
    ......... MB's Avatar
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    Very fair question mate, keen to learn also!
    Assuming the ignition is offski should in my nuffy theory be fine, although I did nearly set a 1961 model 6v VW beetle alight installing a fully sic FM/AM radio headset.
    If in doubt, and or welding aboard, disconnect has always been my safe go to for the added extra 2 minutes work !


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  5. #183
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    Whoops, wrong answer again :-)


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  6. #184
    Patrol Freak Bidja's Avatar
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    MAF sensor clean. Am I doing it wrong, always only just unplug elec connector, remove sensor, give it a squirt, let it dry and then just put it back in / connect and go. No problems to my knowledge.
    2008 GU WAG ST Manual CRD - To do the job

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    MB (27th June 2019)

  8. #185
    I am he, fear me the evil twin's Avatar
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    ECU's are constantly learning and adjusting some engine sensor and operating conditions but it isn't an instantaneous process more a running average sort of deal.

    If you disco the battery for 30 minutes it forces the ECU to immediately start to go thru a relearn process for adjusting individual engine parameters starting from factory or default ECU settings.
    IE the ECU starts from factory trim and ends up at its new trim

    If you don't disco the battery and only unplug and clean the MAF then the ECU maintains its existing trim settings and adjusts its trim starting from that point rather than default.
    IE the ECU starts from the prev trim and ends at its new trim

    FWIW I never bothered forcing a relearn unless I changed the MAF or the MAF was filthy and/or threw codes prior to cleaning as IMHO a relatively clean and functioning MAF won't affect ECU trim all that much after a clean so trim is probably closer to existing than defult.

    Unless you are operating in really grotty environments or getting a lot of Turbo Surge blowing oil film back over the MAF a clean every 30 to 40 thousand K's or so is more than adequate for a normally functioning engine and IMHO the ECU doesn't need a forced relearn
    Last edited by the evil twin; 28th June 2019 at 11:09 AM.
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  10. #186
    Patrol Freak Bidja's Avatar
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    Far bit of road dust around home, guess do maintain air filtration thru life though. Probably has paid off in line with your comment. First 80 thou ks did not go near MAF but have clean every 10 thou ks since (all up 160 thou ks since new veh).

    Then again have had the battery out many times for mods..hahaha
    Last edited by Bidja; 28th June 2019 at 11:59 AM. Reason: battery out many times
    2008 GU WAG ST Manual CRD - To do the job

  11. #187
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    So went to test my maf today and mine does not match any listed here. I have a 6 pin plug with 5 wires. It has nothing in the first pin and then its white, yellow with blue line, yellow with blue line, pink, black. Any ideas on how to test this?? 07 crd auto

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