I have a 93 Vectra 35RQ with a second gen Cummins 12 valve. There is a tube coming out of the intake manifold to what I think is the air compressor. It has a broken elbow. What is this and why is i...
Yes, very common for the air compressor to receive air from the intake manifold.
It is already filtered (main engine air filter), pressure raised by the turbo and cooled off by the CAC. Much better than any other option for supplying it with air.
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