How many EFE switches does a 75 have

Reply Subscribe

Thread Tools

Search this Thread

Sep 20, 2023 | 07:35 AM

Z51JEFF

Thread Starter

Race Director

Joined: Dec 2003

Posts: 14,150

Likes: 937

From: Fremont Ca

2022 C4 of the Year Finalist - Modified

How many EFE switches does a 75 have

And are they all the same,this is on the intake manifold and thermo housing.

Sep 20, 2023 | 09:31 AM

70s

Racer

Joined: Jun 2018

Posts: 282

Likes: 139

From: NH

One for EFE (Early Fuel Evaporation). Now, how many Thermostatic Vacuum Switches (TVS) are there? The answer is two. One for EFE (thermo housing) and the other for EGR (intake manifold). Two different TVS switches each with it's own part number.

Sep 20, 2023 | 09:39 AM

bmotojoe

Safety Car

Joined: Oct 2007

Posts: 4,383

Likes: 1,755

From: Seattle Area Washington

Simple answer to your question is NO, they are not the same...
You will need to go to your assembly manual.
The numbers in the 77 assembly manual for the EGR & EFE switches are found on UPC 6L Sheet 4.
This becomes confusing because there were 3 options for each switch in 1977 anyways.
I was fortunate to have the original switches and part numbers to go by.
Here is what was in my 77.
Notice the EFE switch changes state at or around 180*
The EGR switch changes state at or around 120*

Reply Subscribe

Reply Share

First
Prev
1 / 1
Next
Last

Forum Jump