Dafey
1/2 ton status
Hey Broncoman does yours have this too , It comes off the manifold to this thing then on up to the heater. If you have it where does the vac come from? Anyone?
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.
Cleaned up my engine bay. Help with climate control.
- Thread starter broncoman6524
- Start date
I am thinking that instead just calling it all emissions stuff, we should talk about each item? Here is a label from 1985, but 84 should be about the same.
If you don't have A.I.R., you don't need the DVTR VLV, DECEL VLV or the pump. You probably don't have a catalytic converter anymore, so the A.I.R. system won't do much good. With a cat, you might as well leave it in because it doesn't really hurt anything, either.
Deleting EGR sometimes causes problems with the stock carb, so with a Q-Jet, it's usually best to keep it. EGR doesn't rob power or hurt anything, but it can give some drivability problems when components fail. You probably don't even have an EGR valve anymore? Chances are that your Edelbrock isn't tuned for EGR anyway. This lets you delete the EGR BLEED SOL (which has wires running to the 700R-4).
The TRANS CONV VAC SW (+ its DELAY VLV) is part of the system that controls lockup for the torque converter clutch. There is also a switch on the brake pedal. This system is really the best way to control TCC lockup. If you swap to a manual transmission, it has no use.
The THERMAC system is the VAC MOTOR and TEMP SENSOR mounted to the air cleaner. This is a useful system, even if you have headers, and it operates indedepantly from the other thermal switches. You might as well keep it - it's just one more vacuum hose.
The EGR/PURGE TCC TVS prevents EGR and TCC lockup from happening at low temp. If you eliminated both of those, then you don't need this switch. However, it does trigger the charcoal canister purge, so you would have to reroute that signal, probably right to the carb, but I'm not sure. I think the switch has to be replaced with a pipe plug.
THE EFE/DISTR TVS switch is mostly to prevent vacuum advance on a cold engine. I'm not 100% on how it interacts with EFE.
PCV should remain. No reason to junk it either. It's certainly better than a simple crankcase vent.
The CANISTER only helps the truck smell good and save a touch of gas. Why get rid of it?
You have to keep vacuum advance. There is debate on whether you should use manifold or ported vacuum, but unless you have a computer controlling timing, it is a necessity. It's a real waste of fuel to disconnect it and there is no performance gain.
If you don't have A.I.R., you don't need the DVTR VLV, DECEL VLV or the pump. You probably don't have a catalytic converter anymore, so the A.I.R. system won't do much good. With a cat, you might as well leave it in because it doesn't really hurt anything, either.
Deleting EGR sometimes causes problems with the stock carb, so with a Q-Jet, it's usually best to keep it. EGR doesn't rob power or hurt anything, but it can give some drivability problems when components fail. You probably don't even have an EGR valve anymore? Chances are that your Edelbrock isn't tuned for EGR anyway. This lets you delete the EGR BLEED SOL (which has wires running to the 700R-4).
The TRANS CONV VAC SW (+ its DELAY VLV) is part of the system that controls lockup for the torque converter clutch. There is also a switch on the brake pedal. This system is really the best way to control TCC lockup. If you swap to a manual transmission, it has no use.
The THERMAC system is the VAC MOTOR and TEMP SENSOR mounted to the air cleaner. This is a useful system, even if you have headers, and it operates indedepantly from the other thermal switches. You might as well keep it - it's just one more vacuum hose.
The EGR/PURGE TCC TVS prevents EGR and TCC lockup from happening at low temp. If you eliminated both of those, then you don't need this switch. However, it does trigger the charcoal canister purge, so you would have to reroute that signal, probably right to the carb, but I'm not sure. I think the switch has to be replaced with a pipe plug.
THE EFE/DISTR TVS switch is mostly to prevent vacuum advance on a cold engine. I'm not 100% on how it interacts with EFE.
PCV should remain. No reason to junk it either. It's certainly better than a simple crankcase vent.
The CANISTER only helps the truck smell good and save a touch of gas. Why get rid of it?
You have to keep vacuum advance. There is debate on whether you should use manifold or ported vacuum, but unless you have a computer controlling timing, it is a necessity. It's a real waste of fuel to disconnect it and there is no performance gain.
broncoman6524
1/2 ton status
Blue85 said:
Wow since reading that, the only thing that i am truly worried about is my a/c heater stuff...I have no 700r4, my intake doesnt have the egr capabilities.
The one that i did read was the
I have an edelbrock cheapy shiny cleaner, but i think i still have the adapter parts to put what i think your talking about on. what does this do? simply let cooler or hotter air in at first start?
I did keep my pcv and vacuum advance...im not that dumb
Since your saying the hose i hooked up is a "heater bypass valve" then it is not the correct like for the assistance of climate control. I found another hose that was coming through the firewall, it is just to the left of the wiring harness connector for the cab and clip.
This one was plugged off with a bolt.
(Not by me), and come to think of it my air blows real good at your feet but not so the other vents. Im thinkin this is the correct hose. Should i just run it to the manifold vacuum? and run the bypass vavle into the canister that i pulled off?
broncoman6524
1/2 ton status
oops.
Dafey
1/2 ton status
Blue85 if I dont have a/c does the heater bypass valve matter anymore?
