Bogging Hesitating- maybe vanos for me

[T325i]

i dont know maybe you guys could help me out. my car seems to have lost much power and it seems to just burn gas. i thought it was maybe spark plugs or coils. spark plugs look fine. but idk how to test the coils. anyway i was going to school this morning and around 2500+ rpms the car sounded horrible like grinding almost. also, sometimes at idle (which is low) the car sounds like a barking dog for a second every once in awhile.

any help PLEASE?

[The Badass Gold]

this may sound a lil odd but have you messed with you fan any latly ?
when i did my s50 cam swap i didnt get the fan shroud right and a about 25k i get this odd buzzing noise i thought oh now i just got my cams in and now vanos going out. however when i looked under the hood and had a frind hold hte rpm at about 25k i found thathe noise wasent from the engine. i killed hte car and every blade had been carved down by the shroud.
just a thought give it a look

[T325i]

yes i am always taking that thing off. thanks maybe i can check that. i dont think that would explain the power and MPG loss thought.:eyecrazy hah

[restricted]

i would look at vac lines first also o2 sensor have you tried to pull codes

[Purpleslug]

here is a link to the same problem everyone else has aslo

http://forums.bimmerforums.com/forum/showthread.php?t=407255&page=0&highlight=bogging

have fun reading lol i spent most of the day reading this about a month ago

[T325i]

yeah i changed the O2 sensor in the summer. and last winter i changed the boot that goes to the TB. i've gone through 80 something pages and i didnt know were to start. everyone had different problems. and no codes. but i did et a MAF code 2 weeks ago. but now its gone.

[Purpleslug]

haha i have the same propblem but the first thing would be is to find out what your car is saying when its running so till you know whats up its really hard to say. like first you need to know if your knocks sensers are reading anything at all and then what your crank case pressure is at when running.

[T325i]

so scan tool to see if i throw any codes??

[Purpleslug]

well the shops i goto to check my stuff uses a snap-on tool that says if crank case is low and or running lean or knocks are reading somthing ect...