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Tech Article

BMW E30 3-Series Air Flow Meter Housing Reassembly

Last Updated: 06/21/2017
Parts Group: Air filter box
This article discusses the air flow meter and housing (a.k.a. mass air flow sensor and its housing), for the E30 with the main focus being on potential issues I ran into when reassembling it. If you're not here for the technical analysis but would rather buy a used unit (or any sub-components, large or small) from us, guaranteed to work and fit, then please select the link below:The information herein is based on my own car.

I considered it prudent to buy a new gasket for where the air flow meter mates up to the housing. I bought mine from Pelican Parts: OEM gaskets for $7.50 each. I bought two, on the assumption that I might tear one, and didn't want the project to be delayed by another week as a result.

Four clips keep the two halves of the air flow meter housing snugly together. On my car, two of the four clips were missing ... not good. If the housing is yawning open and the air flow can bypass the air filter, that's not good.

I figured it's good to first install the 13mm bolt that attaches the air flow meter to the strut that's part of the housing. That way, the weight of the air flow meter doesn't strain the air flow meter housing, possibly causing a leak due to distortion or a crack being formed.

On my car's air flow meter, the hole with the 13mm strut bolt had been stripped, so I needed to re-tap it.
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