So I finally had some time to work on the x again today and I found it.

The Oil sipstick downtube separated at the joint halfway down. I could see caked oil residue in the joint. I cleaned everything up snapped it back. cleared my codes and started it up and went for a drive.

The e53 runs and Idles perfectly now. The vacuum leak was in the dipstick downtube.

I've also replaced the airfilter after you guys mentioned the MAF readings were low and those readings are higher now as well.

Thanks again for all the help.

I'm off to dump the oil and do a rear brake job now. I love this fall weather for working on the cars

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