Same engines, big difference?

[BenM]

And what does the vacuum reservoir (for the heater control valve) look like? I can't seem to locate this in my TSM.
Are the vacuum motors on the breather neck crucial?

The vacuum reservoir is either a black tin can or a plastic ball like the 81, they seemed to use them interchangeably.

One vacuum motor on the air cleaner brings heated air from the exhaust and the car may run just fine without it, although your carb may ice up on cold, humid days; I've had it happen in other cars.

The other vacuum motor just needs a delay valve and a line to any manifold vacuum source. It closes the filter off so that gas vapors go into the canister and don't evaporate and make the front of the car smell like gasoline on hot days. Without it hooked up you have very little air flow to the engine. The delay valve, sometimes with a small reservoir or in a pinch just a check valve will do, keeps the door from slamming shut when you're accelerating hard and is absolutely necessary.

[carnuck]

Here is the underside of the hood on my '81 Wagon


On the left side of the pic (passenger's side) behind the York compressor is the air suspension/on board air pump. I finally dug enough stuff out of the way to get a pic (and start the trans swap) On the right side of pic (driver's side) you'll see the AIR system compressor people have been telling me don't exist in Eagles.

[rollguy]

On the right side of pic (driver's side) you'll see the AIR system compressor people have been telling me don't exist in Eagles.

Here in Cali all the Eagles have an A.I.R. (Air Injection Reactor) pump.  The pulse air system must have replaced the A.I.R. system, as I have not seen both on the same engine.