So normally this is a system that gets thrown away very quickly, but seeing as I’m trying to build a truck that will be ok in cold, I’ll fix it. Underneath the throttle body / intake manifold, is a small plate.
It’s labeled #48 on the diagram for the “air flow meter, hotwire and gems EFI” setup. Below is a picture of it in the truck. Really hard to see.
This plate acts as a heat exchanger to warm up the incoming air to prevent ice forming on the throttle body butterfly. Mine was trashed and rusty, and the gasket had dissolved leaving a lovely goop on the manifold.
This was a fairly simple design and below is an example of how it’s supposed to look.
Here’s the part, cleaned up inside, without the gasket.
My gasket is trashed. Let’s make a new one using an old camper tail light.. The aluminum is about the same thickness as the gasket, and it will not galvanically corrode, unlike steel, and it’s not water soluble, like the original paper one.
add some tin snips, a hole punch and some time, and we are ready to reinstall.
