repairing the hot air inlet system

I had the some problem. My issue was the flap broken. I fixed it to the arm making a small hole and using a wire. Try the following test. Connect directly the vacuum, port on the manifold directly to the flap, to see how it runs.

Joao

Ah. The beer is the problem.

As Joao said, just connect the vac to the diaphragm for the winter.

The manifold preheat has very little effect on icing; it's there to vaporize fuel in the manifold.

Speedy Jim

"The manifold preheat has very little effect on icing; it's there to vaporize fuel in the manifold."

I was of the impression that the heat from the pre-heater tubes was supposed to migrate up the manifold and warm the carburetor, but even with BOTH tubes(the 74 only version of this system) hot enough to burn me, the outside of the venturi section of the carburetor is still cold to the touch. I will give the direct-connect method you and Joao mentioned a shot. I can always just plug the port(as it is now) when it starts to warm up again.

Thanks,

Chris

Doesn't the '74 have fuel-injection?

..........'75 was the first year for the L-Jetronic bug.

Well, if it did it was removed before I got ahold of the car. I believe however that the fuel injection did not arrive until the 1975 model yaer.

Chris

Chris, The sensor is there to control temperature of the air that goes in. The sensor must begin to open at 28C (82.4F). The idea is to mix cold and warm air to keep it at 28C (82.4F). The bay must be very warm before you disconnect the vacuum from the flap. Maybe you can build an electronic device to do the job or just clean the sensor. It is a bimetallic device so it is suppose not to break.

Joao