26th May 2012, 18:03
Member, P500 Sport, MDM on (>800)
Join Date: Nov 2009
M5 Le Mans Blue
Thanked 236 Times in 145 Posts
Airflow across the maf needs to be in the correct direction, in this case towards the centre of the car. Both left and right hand side maf sensors are the same so to get the correct airflow one has to be inverted compared to the other. They are all like that sir!
Re the stripped thread, I'd be inclined to add some epoxy to the hole and screw in the screw, then add a zip tie over the screw's head to ensure it won't come out. You might be lucky and find someone has a spare maf tube they could sell you for a reasonable sum. Until then I'd be confident that the repair would be ok (in a normally aspirated engine the air is sucked in, so it would have the effect of sucking the maf sensor in rather than pushing it out).
Originally Posted by pingufreddy
I own a 2002 M5 with 50k. miles in mint condition.
I was worried about the MAF's and thought that they may be slowing the beast down b/c I bought oiled fiters from K&A (?)
Anyway. I just cleaned my MAF's after locating the hard to find Torx safety 25 ratchet bit. The left hand MAF (facing the car) had a ripped rubber housing cover. I noticed that there was no writing on the MAF plate itself visible to the person looking down at it. I removed the screws, and saw that the MAF wires were facing DOWN in the assembly. The way the harness was set up it was impossible to rotate the plate to face up.
On the right side it was the opposite. The MAF wires pointed UP. On this side there was no rubber cracking or wear. Also, the screw on the left hand side (top) was stripped; tightened but not all the way and kept revolving.
I cannot get a throttle body replacement without buying a whole new MAF.
What do you thin about the opposite facing of the MAF's ? By design or by someone being stupid? DOes it make a difference in performance?