Vacuum advance question
Thread Starter
|
Elder User
Joined: Aug 2004
Posts: 796
Likes: 1
Vacuum advance question
99% of the time when I see a picture of a vacuum advance, there is only one vacuum line going to the canister right in front. My canister has a second fitting pointed straight up. It has been capped off. I am curious if this is supposed to go somewhere, or if maybe the canister has been replaced at some point. I do not see a number on mine anywhere, but it is a genuine motorcraft.
Any thoughts? '74 302 with in a F-100.
Any thoughts? '74 302 with in a F-100.
Cranky Old Guy
Joined: Mar 2008
Posts: 3,562
Likes: 6
From: Raphine, Virginia
Going by my feeble memory, it hooks to a ported vacuum switch close to the thermostat housing. It's actually temperature controlled. There was another delay valve that looks like a small inline fuel filter like you see on a lawnmower. Different colors for diff amounts of time delay. Never found one with everything hooked up.
Thread Starter
|
Elder User
Joined: Aug 2004
Posts: 796
Likes: 1
I was told that the temperature controlled line went to the EGR, which is not connected because my EGR wouldn't work even if it were connected. I have the temperature switch, but nothing is connected to either end of it.
I know there are supposed to be several vacuum lines running around the original air cleaner. My flexible ducting was in bad shape though so I did away with all of that stuff and just put a regular air cleaner on it. I would have have to look to make sure, but honestly I think there is only one vacuum line on my whole engine and that goes from the carb to the vacuum advance. I know all the ports on the manifold are just capped.
I know there are supposed to be several vacuum lines running around the original air cleaner. My flexible ducting was in bad shape though so I did away with all of that stuff and just put a regular air cleaner on it. I would have have to look to make sure, but honestly I think there is only one vacuum line on my whole engine and that goes from the carb to the vacuum advance. I know all the ports on the manifold are just capped.
Thread
Thread Starter
Forum
Replies
Last Post
whitesdford
1999 - 2003 7.3L Power Stroke Diesel
4
Mar 4, 2013 10:19 PM
Nick Greer
1973 - 1979 F-100 & Larger F-Series Trucks
9
Aug 2, 2012 08:28 PM
CATANG MOTORSPORTS
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
10
Sep 21, 2008 10:48 AM
