EGR Ported Vacuum Switch Question
Thread Starter
|
Senior User
Joined: Aug 2008
Posts: 187
Likes: 0
EGR Ported Vacuum Switch Question
I just bought a new ported vacuum switch for my EGR valve, and it has two ports. The top port is marked "E" and the bottom port is marked "S". Which port does the EGR valve hook to, and which port is for the ported vacuum source?
Posting Guru
Joined: Oct 2010
Posts: 1,199
Likes: 1
From: Missouri
I agree with the above, it shouldn't matter but for reference the vacuum diagram for a factory Holley 4180 equipped vehicle will have an "S" for the ported vacuum advance source on the carb and "E" for the EGR port on the carb. (Both ports are essentially "ported" but I hooked a vacuum gauge to the EGR port on a 4180 and it only pulled 5" of vacuum off idle, while the ported source matched full manifold vacuum off idle).
Thread Starter
|
Senior User
Joined: Aug 2008
Posts: 187
Likes: 0
YES, that is exactly what is looks like. And the vacuum lines can go to either port?
The problem is, my replacement carburetor doesn't have a separate "E" port for the EGR like my stock carburetor had. I was going to just tee it in to the "S" port on the carburetor, which is the same port the vacuum advance goes to. Will that be ok?
The problem is, my replacement carburetor doesn't have a separate "E" port for the EGR like my stock carburetor had. I was going to just tee it in to the "S" port on the carburetor, which is the same port the vacuum advance goes to. Will that be ok?
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
If it's a Holley or an Edelbrock all the installation manuals are available online at the manufacturers website's.
Old School Hot Rodder
Joined: Feb 2006
Posts: 6,472
Likes: 11
From: Exmore, VA
RE: EGR Ported Vacuum Switch Question
FYI. on the 2-port valves, "S" is signal or spark, "E" is EGR valve. When the valve is closed the "E" port is vented internally so that there is no possibility of having vacuum on the EGR valve. Once the operating temperature is reached, "S" and "E" are connected. If you reverse the ports, you will have a vacuum leak at low temperatures.
Trending Topics
Senior User
Joined: May 2005
Posts: 315
Likes: 0
From: SW Kansas
If you guys will recall, I re-did the EGR on my 83, but it has 3 connectors. Thinking of fixing my 80 (it's not connected at all), it has 2 like the pic. Good info here, I'll just nab the lines off of my 83, fix it in 5 minutes. Truck is running good, fuel mileage is kinda poor.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Moderator
Joined: Jan 2001
Posts: 56,984
Likes: 2,738
From: Virginia
FYI. on the 2-port valves, "S" is signal or spark, "E" is EGR valve. When the valve is closed the "E" port is vented internally so that there is no possibility of having vacuum on the EGR valve. Once the operating temperature is reached, "S" and "E" are connected. If you reverse the ports, you will have a vacuum leak at low temperatures.
Thread
Thread Starter
Forum
Replies
Last Post
jmulvihill
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
6
Mar 11, 2009 08:02 AM
