Only runs correct when no MAF is plugged in?!

[fishhouse4]

Originally Posted by Overboost

What MAF sensor brand did you replace it with? There are a lot of horror stories out there with cheap MAF sensors. When you unplug the sensor, the DME reverts to Alpha N mapping (throttle vs. RPM). Plugged in it uses the MAF values. If the MAF was Genuine BMW or OEM then I would check connections at both ends (MAF and DME) and look for any physical damage to hoses or orings.

All Bosch. That would be OEM, correct?. I've been through 4 of them now - and all from different sources (eBay, Advance Auto, Napa Auto, etc). It would be insane to believe I have had that many duds.