Quote:
Originally Posted by Bub Whitaker
EGR valves on tubes in the collectors at 45 degree cut to draw when exh velocity gets up to take over when intake vacume diminishes. the EGR valves on the collectors also seal the same way as the brake booster valves so there is constant vacume in the crankcase...
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I think you mean....air injection check valves.
A EGR valve injects exhaust gases into the intake as an inert gas to control NOX. Cool the combustion mixture.
Smog test guy (CA) so I had to answer.