Didn't wade through all the answers, so ignore if this has been answered. In regards mounting the ICV backwards, I did this, and for no reason I can think of, it did not run right. Idle was erratic. Correcting airflow direction solved that. Arrow should point toward the intake manifold, away from the airflow meter plenum.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7