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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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The MAF is the Mass Air Flow sensor situated twix the air intake box and the throttle body, unplug the connector to this. 3 variations here:
Mass Air Flow Sensor (MAF) - Automotive illustrated glossary
Ps. where are you in the UK as I Have diagnostics...
Your problem is the seals that BMW used to control the varable cam timing in the
Vanos system--Change out the old seals with the new Besian System seals and you
will have a car that will perform like it was new again--check their website--there is a complete DIY there thats so simple even I did it --with out even a hitch.
With the seals being ineffective--the timing of the engine is not up to snuff--change those seals and it's all back as it should be--you'll love what it does for the car.
Yes --it still makes sence--the seals control the varable timing in both the intake and exhaust cam--if the timing is off the engine doesn't run as well as it should. The OEM BMW seals have been shown to wear out in as little as 9000 miles. You could still have the engine start and seem OK and you will think all is well, but after installing the new Besian seals--you will be able to tell the difference as soon as you pull out on the road.
Now there is some break in period--but the performance will keep coming as soon as the car is cranked. I would also point out that you should look around for vacuum leaks that can be a cause of lack of power. The ccv valve ant the 4 hose's that hook to it should be changed out every 80k miles--check around the intake boot where the throttle body and the idle control valve hook toghether--I would also suggest that if you haven't already --remove both parts and clean them well--would give you a good chance then to check around for vacuum leaks--another spot is behind the intake manifold on the passengers side of the car for you(almost forgot --you gents drive on the wrong side)
back behind the intake --there are a number of vac hose's that should be replaced and updated--lots of heat back there and that heat can cause the hose's to decay.
You will need to remove the cabin air filter and housing on that side and use a flashlight and a small mirror to search around back there and see of what I'm writing about.
Hope that helps
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