I just took my 2004 545i out of the shop for the 3rd time. I replaced the vacuum pump, coil packs, spark plugs then they said they completed the SI B11 07 06 as well as a fuel service and the car still idles rough. Adtvantage BMW of Houston is now telling me I need a new AC compressor because it is drawing too many amps and that will fix my idle. Wow. My AC works just fine and it blasts cold air.
What now? I do not know.. I will clean the MAF sensor and look at the Manifold Adjuster, DISA valve and see if that may be a fix. Any ideas?

 

You replace the crank case vent valves???

 

Thanks Evolution!. I did and used the old covers because the new ones did not have the nipples on the. I still have that same problem but have the new valves. I was also informed to replace the crankcase ventilation hoses. I would think I need a smoke test first. Heck , I do not know. I hate to pay for a MAF sensor, Manifold adjuster and hoses and the problem not fix but I may have to. I just do not know which to start with . . .maybe the manifold adjuster?

 

panochote - keep us posted on your car, sorry to hear that you've replace things upon recommendation by your dealer, but problem hasn't been fix.

 

I am very curious as well. I have a 550i that i cannot get rid of an idle vibration. I have tried everything i can think of. Unless its Valvetronic or software related. All i can think of.

 

I have this problem as well. Mines very slight but I notice when its colder out it will idle even a little rougher until it warms up. RPM seems to jump a bit more with colder temperatures. It has to be some sort of vacuum leak. If you end up getting a smoke test let us know what you find.

 

I will let you all know. I am just trying to find the exact DIY for the crankvalve hoses and exact location of the Manifold Adjuster. If anyone can help here I will appreciate it. I will spend the money now if I do it. I do not mind doing so but I do want to see if that DISA valve is broken or not (inside of the adjuster).It is simply aggravating idling and the car just wants to car at a red light too. I was also told this weekend that it is the nature of these engines. I can't believe that.

 

BMW TIS - 11 61 095 Removing and installing/replacing DISA adjustment unit - That's for the DISA

 

Theres a picture of the crankcase hoses. Couldn't find a DIY. Looks like they connect to the front of the intake manifold then to the valve covers. Don't quote me on that though.

 

Yup, intake manifold to valve covers. You can see the Y-pipe in the picture.