Vacuum Diagrams
Thread Starter
|
New User
Joined: Feb 2009
Posts: 13
Likes: 0
From: Southern California
Vacuum Diagrams
Hey guys,
I'm kinda new around here and have been searching with out much success. I'm looking for a vacuum diagram for my 79 F150. I have found generic diagrams but I need to pass smog in CA. the information number on the engine sticker is D9TE-9C485-AGA. I read somewhere the AutoZone had diagrams but spent a wihile looking and could not find them. :/
I'm kinda new around here and have been searching with out much success. I'm looking for a vacuum diagram for my 79 F150. I have found generic diagrams but I need to pass smog in CA. the information number on the engine sticker is D9TE-9C485-AGA. I read somewhere the AutoZone had diagrams but spent a wihile looking and could not find them. :/
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
You won't find such a diagram. What's on your engine? It's pretty straight forward. You probably have an EGR valve, which connects to ported vacuum through a ported vacuum switch. If you have a smog pump, the diverter valve connects to manifold vacuum. Those are the two most basic smog components. While other mechanisms did exist over the years, those 2 devices should get you to pass smog assuming everything is in working order (tune up, etc).
In addition to the aforementioned equipment, the AC/heater controls, power brake booster, and modulator valve (for automatic transmission) connect to manifold vacuum as well. In most cases, the vacuum advance on the distributor connects to ported vacuum.
The only thing I'm not 100% clear on is the evaporative cannister, which you would need to pass a visual inspection. I believe the purge valve sources from ported vacuum through a ported vacuum switch (same as the EGR signal), but I'm not totally sure.
In addition to the aforementioned equipment, the AC/heater controls, power brake booster, and modulator valve (for automatic transmission) connect to manifold vacuum as well. In most cases, the vacuum advance on the distributor connects to ported vacuum.
The only thing I'm not 100% clear on is the evaporative cannister, which you would need to pass a visual inspection. I believe the purge valve sources from ported vacuum through a ported vacuum switch (same as the EGR signal), but I'm not totally sure.
Thread Starter
|
New User
Joined: Feb 2009
Posts: 13
Likes: 0
From: Southern California
Thanks,
One of the things that i'm not too sure on is the Evaporation Canister as well, I went and got it smogged but it failed the visual test. All the guy gave me was that the vacuum lines were not correct.
One of the things that i'm not too sure on is the Evaporation Canister as well, I went and got it smogged but it failed the visual test. All the guy gave me was that the vacuum lines were not correct.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
On my evaporative canister on my '81, the vacuum line went from the vacuum canister into a T. One direction went to the fuel bowl vent on the carb, and the other went to the bottom port on the PCV valve.
Thread
Thread Starter
Forum
Replies
Last Post
DrZoom
1987 - 1996 F150 & Larger F-Series Trucks
12
Aug 25, 2015 05:56 PM
ewmeassoc
1973 - 1979 F-100 & Larger F-Series Trucks
9
Mar 3, 2015 07:45 PM
78 & 87 Super Cab
1987 - 1996 F150 & Larger F-Series Trucks
6
Nov 22, 2013 10:11 AM
78bumpside
1973 - 1979 F-100 & Larger F-Series Trucks
1
Jan 20, 2011 03:18 AM
