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  1. #1
    KennygDownunder
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    MAF sensors and Oxygen Primary sensors

    Hi all : greetings from waterlogged Queensland State in Northeast Australia. I have a 1999 Model E39 M5.Problem started intermittedly a couple of years ago now but finally now all the time. With engine warm at normal operating temperature I have limited acceleration to about 3000RPM . Drives fine in higher gears under moderate acceleration. ANY attempt to accelerate in a "spirited way" leads to seemingly nothing over 3500RPM and lots of hesitation. Codes indicated Primary Oxygen sensors so replaced both of these ( X2 )...problem still evident.....pulled 1 MAF connection off..."POW" back to normal acceleration. Replaced this MAF and reconnect ......problem still evident ! If i disconnect this ( new ) MAF it goes normally. My mechanic is pulling out what little hair he has left.Engine runs fine but difficult to cold start if left for say a week without cranking. ( starts but wont idle.....after about 4 or 5 tries then goes fine ). Can any of the brains here help me please ? I just LOVE my E39 and the wife is giving me grief again about " too many cars" ( can you have too many ? ) and I DON'T want her to pressure me into selling the E39 M5 ( I have tried the M5 forum first but nobody ever reads it ). Thanks in anticipation fellas ! :)...............Kennyg Downunder


  2. #2
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    Member No: 4328 jimlev will become famous soon enough jimlev will become famous soon enough jimlev's Avatar
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    Too many cars, I hear ya (m)

    You said with the new MAF disconnected it runs fine, right?
    Sounds like the new MAF is defective. Was it a BMW Bosch MAF?

  3. #3
    Panos
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    try m5board


  4. #4
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    Re: try m5board

    Yeah thanks i tried the M5 board first but nobody has replied and amt the car is " off the road " so I'm getting desperate ! :).......kennygDownunder

  5. #5
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    Re: MAF sensors and Oxygen Primary sensors

    Well I know everybody here in going to say " I told you so........" but i had FORGOT I am running ( dual ) K & N Filters on my M5.......yes........the MAFS BOTH had a fine layer of K & N oil on them...........THIS has caused my problem. Thank you ALL for your thoughts and i decided to post this to warn any other posters who use K & N Filters ( or similar ) : CHECK YOUR MAFS FOR FILTERCHARGER OIL ! :) Cheers all ............KennyGDownunder

  6. #6
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    Thanks 4 the follow up, wish everyone would do it






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  7. #7
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    By the way, I was reading the K&N recharger kit

    instructions the other day (my truck has a K&N filter in it) and I suppose this is the first time I had ever read the directions before. It stated that you should allow about 30 minutes before reinstalling to allow for complete drying. I never realized it completely dried. I usually just washed it, oiled it, waited about 5 minutes (usually less) and put the filter back in.

    That should help as well as going lighter on the oil. My Harley also has a K&N filter which I will clean and oil soon and I will try this as well as clean the MAF, It began sputtering off idle after the last cleaning/oiling.

    I have not and probably won't install a K&N in the 540.

    Michael
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  8. #8
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    The Dinan CAI comes with a filter that looks just(

    like a K&N. I do have the sock on it. Haven't had any problems with it, I think it's an oiled filter, however I really can't detect any oil film on it. Anybody know?

  9. #9
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    I also couldn't detect any oil film on them...

    so I called Dinan, and the Rep confirmed it; they are indeed oiled filters.

    Vin

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