56 Imperial Carb Set Up

I have both a 55 coupe and 56 limo both with A/C and noticed that this dashpot is there, along with an electronic/pneumatic solenoid that is forward of it. The two items seem to work together. On the A/C cars the shop manual says that the electronic /pneumatic solenoid is meant to raise the engine idle when the A/C is on and the engine is in neutral (sounds like your situation ???) presumably so the engine will not stall with the A/C engaged. I looked at the 56 shop manual and the only mention of a solenoid was in the A/C section in the electrical schematic. The 1955 shop manual has quite a bit more information in the A/C section including an adjustment procedure for the electro/pneumatic solenoid. My thought on the dashpot (passive element) is that perhaps it is used in the system to gradually lower the idle when the system is in operation. This is just an opinion since there is nothing about it’s impact to the system.

Does your car have A/C?

Brad Cerra

-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx [mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of Gerry and MJ Norberg
Sent: Friday, May 21, 2004 11:51 PM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: IML: Fw: 56 Imperial Carb Set Up

----- Original Message -----

From: Gerry and MJ Norberg

To: mailing-list@xxxxxxxxxxxxxxxx

Sent: Friday, May 21, 2004 1:36 AM

Subject: IML: 56 Imperial Carb Set Up

Hello Gang:

I just got my 56 Imperial home from the shop today after an extensive restoration. It was there for almost 2 years. However there are some minor glitches that I need help with. At the left side and slightly to the rear of the carb (assuming you are sitting in the driver's seat looking forward) is an assembly composed of a rubber diaphram, spring, idle set screw, and the main throttle linkage from the foot pedal passing through and attached to the right side of this assembly. What the heck is this doo hickey called? What is the impact if the rubber diaphram is cracked? It is cracked and you can easily see the spring just underneath. I can't see any vacuum lines running into this unit. In any case I am having trouble getting the engine to go to a slow idle even with the idle set screw backed right off. The return spring is plenty strong enough. Engine was completely overhauled along with the carb however the unit I am refering is not attached directly to the carb so was not overhauled.

Thanks,

Gerry Norberg