545 RPM problem
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Joined: May 2008
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Do these things have PCV valves? Hard to start when hot sounds sort of sounds like a classic PCV valve issue. Search around, they are cheap and generally easy to change. You may even be able to test it by shaking it. You should hear a ball bearing shake around. If it is all oily and you can't hear the ball bearing shake, it probably needs replaced.
I just start to thinking about MAF, could be? Could MAF make problems with engine starts?
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From: Austin, TX
My Ride: 2004 545i Sport Pak
If you're referring to Mass Air Flow sensor then beyond my expertise, but I would imagine it could cause all sorts of problems including hard to start, rough idle, reduced performance, reduced gas milage. But I would think you would get a warning if your MAF is having trouble.
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From: Zoo York
My Ride: Alpine White 2006 530Xi (SLD)
Why not try to clean the MAF sensor? That's where I'd start. If problem's still there after a good cleaning, start looking at coils, engine management and so forth. But start with the easiest cheapest fixes and work your way up. Worst case, you'll end up with a mini tune up. Speaking of tune ups, how many miles on your car and when was the last time you took it in for one?
Good Luck
Good Luck
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Joined: Aug 2007
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From: Austin, TX
My Ride: 2004 545i Sport Pak
No our 5ers do not have Positive Crankcase Valves however, we (545,550) do have Pressure Regulating Valve instead. They serve pretty much the same purpose, and mine at the time illuminated the CEL.
Check this DIY I did last year with detailed pics on page 4:
https://5series.net/forums/topic/853...e/page__st__45
Check this DIY I did last year with detailed pics on page 4:
https://5series.net/forums/topic/853...e/page__st__45
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