Interesting. I’m not 100% sure how the system works on EEC-III CFI. I know the manifold end is a little loose on my Mark VI, I didn’t really get in there far enough to see how it’s connected, but there is definitely some air flow through the tube.
Then there’s the vacuum actuated flap in the air cleaner housing. I didn’t trace the vacuum line to see where it goes. All of the hoses and lines on the car look like they’ve been replaced in the last few years and I don’t have any known leaks.
It seems to me that the flap springs open under no vacuum, therefore at cold engine temps vacuum would pull the flap shut. Then it would open when the engine warms up. I have no clue what actually controls vacuum to the flaps actuator.
Then there’s the vacuum actuated flap in the air cleaner housing. I didn’t trace the vacuum line to see where it goes. All of the hoses and lines on the car look like they’ve been replaced in the last few years and I don’t have any known leaks.
It seems to me that the flap springs open under no vacuum, therefore at cold engine temps vacuum would pull the flap shut. Then it would open when the engine warms up. I have no clue what actually controls vacuum to the flaps actuator.
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