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Old 01-28-2013, 09:43 AM
Dackelone Dackelone is offline
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Location: Bayern, Germany
Join Date: Apr 2012
Posts: 136
Mein Auto: 540i v8 manual
Originally Posted by hh3uunp View Post
The first thing I would do is New MAF and Air Filter because they are cheap and very easy DIY. If that doesn't work start doing the vanos and hard stuff.

In my 540i my Maf died twice so the engine goes flat around 200 hp instead of 282 hp
+1. Just because its a new part does mean you have a GOOD part.

I would also replace the rubber boot going from the MAF to the throttle body/housing. They always crack and cause vacuum leaks.

Only other thing(s) is maybe your fuel filter(with built in fuel pressure regulator) and maybe fuel pump not delivering enough fuel when under load. ?
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