Maybe its to mitigate the idle stalling problem that a lot of these cars have. For any DIYer of earlier models, I would think the diameter of that tube would be critical, as well as determining if the ICV has the same part number.

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma