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7 Series - F01 (2009 - current)
The new re-designed 7 series leads off the BMW Fxx chassis code!

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  #1  
Old 12-22-2012, 11:17 AM
kpumroy kpumroy is offline
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So I cleaned my MAF sensors....

I was having some hesitation and what felt like lean stumble with light throttle so I decided to clean my MAF sensors. It was a little more involved than I originally anticipated. To get the sensors out you must first remove the top of the air boxes. This requires the proper torx fitting. On the passenger side one of the fasteners was hidden under the wiring harness for the O2 sensor. Then loosen the boots that connect to the air box. The airbox top can then be lifted off. Once off you can get to the MAF sensors. Carefully disengage the locking tab with a small screwdriver allows the wiring plug to be removed from the sensor. The sensors were visually dirty even though I only have 18,000 miles on my 750i. I sprayed them with CRC Mass Airflow Cleaner getting all of the little openings and let them dry. While I had the air boxes open I cleaned out the LEAVES that had alost filled the passenger side box and shop vacuumed the filters and boxes. I noticed that the airbox tops have the activated charcoal emissions filters built in. I left then in place but some may want to remove them. I put everything back together and went for a test drive, to the beer store.
For the best part, its like a better than new car! The hesitation is gone, the car is silky smooth and fast. It is much more responsive, it even shifts smoother. Not sure if it was the sensors or the leaves that were plastered to the pleats of the air filter but it made a dramatic difference! A little tricky DIY but not that hard really.
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  #2  
Old 12-22-2012, 11:33 AM
MINI+BMWtek MINI+BMWtek is offline
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Mein Auto: e30 318
Ok that confirm you need a maf

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Old 12-22-2012, 02:16 PM
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csmeance csmeance is offline
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I think the leaves being in there are a huge issue since they restrict a TON of flow through the filters!
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Old 12-22-2012, 07:14 PM
chrischeung chrischeung is offline
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When are the air filters changed per maintenance? Are they periodically emptied?
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Old 12-22-2012, 08:33 PM
Tuesday Tuesday is offline
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Great info! Thanks for the write up and the how-to, I will try this soon.
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Old 12-23-2012, 05:32 AM
kpumroy kpumroy is offline
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Thanks. I don't know what the replacement interval is on the air filters. I tapped on them over a trash can and then shop vacuumed them. They looked pretty clean. They are one of a kind filters mounted on a plastic bed that seals around the air boxes. I bet they are pretty pricey to replace.
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Old 12-23-2012, 03:46 PM
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Popoemt Popoemt is online now
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Good info, any chance you took some pics during the removal and could share them? V/r, Tim.
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