“Blue” area is where PCV hose goes to intake. Red goes to idle valve / cold start injector pipe work. I’m just not sure what it specifically does. After doing an EGR delete, I’m sorting out what’s needed and what isn't. Cam cover will be off shortly so should be able to figure it out.
The cold start injector would have a fuel line connected to it coming from the fuel distributor. To delete the egr function all you need to do is disconnect the vacuum hose to the egr valve and plug it.
Yes mine had the same hose from intake box to cam cover.
I'm not sure what a metering orifice actually is ? Its about the only thing on the entire engine that wasn't obvious to me in its purpose, everything else was pretty straightforward. Do the V8's have a similar setup ?
Most engines I've worked on always have a pre throttle plate PCV hose, as does this engine to the airbox, not much more effective than a vent to atmosphere system as far as vacuum. The vent valve feeds directly to the intake ports via the IACV hose which is under full manifold vacuum post throttle plate of course. Still questioning if it is really necessary over and above the vent pipe to airbox. After completing a fairly exhaustive clean up process on this intake I don't want any more crud moving past the valves or intake runners.
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