Jaercole
Newbie
Hello all. New to this site. Bought a 99 GMC Suburban K2500 7.4L to pull a travel trailer. Needed a bit of work but got it running smooth now. But there is a tube that connects to the front driver side piston exhaust manifold. It is broken on mine so it's causing that leaking tiss tiss tiss sound. I want to replace it but don't know what it is. My mechanic said it was the secondary air injection tube. But a google search shows nothing like it. Pic attached.
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