70 LT-1 Vacuum Advance Solenoid

[Hotrodpaul]

I am having trouble with the idle on my 70 Z Auto. I have set the idle at 900 RPM but when I shift into drive or reverse the idle speed reduces to 500 or so and the engine wants to die. I have listed some pics of the solenoid which works and is energized when the ignition is on.

It seems to me that the solenoid should be energized in reverse or drive to add vacuum advance to the distributor, raising the idle speed in gear. Here are a few pics of the solenoid:



http://i3.photobucket.com/albums/y86...6/DSCN0228.jpg

Anyone have a pic of the correct hose routing? Thanks,

Paul

[70Z]

This help?

[Hotrodpaul]

I can't tell where the hoses terminale. I assume the left one goes to the vacuum advance, the middle one to the carb vent and the right to manifold vacuum? What is the function of this solenoid?

Paul

[Belair62]

You are correct in their location except the right hose goes to the carb vacuum port Paul...this solenoid activates and sends vacuum to the distributor in 3rd and 4th gear on a 4 sped...not sure on auto ....it's called a TCS solenoid...it was an emission thing I believe.

[Jacsey 70Z]

I'm not sure that's the type solenoid you should have for a auto car. Yours should be on the Carb. It's a combination TCS CCS it has the hose that goes to the vacuum advance. On the auto cars you get vacuum in reverse and 3rd.
I've never owned a automatic car just read about the system when I was trying to get my TCS working on my 4 speed car.
Jack

[Belair62]

Paul...I learned the vac line routing over at NastyZ28.com where Jack posted pics for everyone...you may want to stop over there and ask around unless someone around here can dig up the automatic version...