Originally posted by 5point1:

So, correct me if I am wrong, but isn't that tube basically useless? I'm 99% sure that all it does is insure that the small amount of vacuum that is present at the valve cover connection is always sucking-in clean air, and that's why the other end is connected past the air cleaner/filter.




You forgot about the MAF.

The air is measured by the MAF - if it is not, the mixture will be off.

"Those who cannot remember the past are condemned to repeat it" -George Santayana