|
The purpose of the ambient air valve is to prevent freezing of the throttle body during cold weather starts. The part in question is a check valve to keep air flow to the ambient air valve in one direction. As I stated previously, I believe it is nothing more than a PCV valve and could be replaced by a new one of similar dimensions.
The part shown in the above link is a restrictor to maintain a certain vacuum in the later CIS intake when the oil cap was removed with the engine running. It would not prevent a reverse air flow. It was not needed in early CIS like my '73.5.
__________________
Ed
1973.5 T
|