78/79 Emission & Vacuum Diagram Picture Reference - Page 2 - Ford Bronco Forum
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post #21 of 56 (permalink) Old 03-18-2012, 10:10 PM
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Originally Posted by TNT89Bronco View Post
I think it sort of boils down to what kind I'd inspection you have to pass. Here on the left coast, we get the anal probe and full physical every two years. There are MANY threads here, where people talk about taking off all the "Smog Crap"' and their rig runs fine. I am concerned that I do everything possible to make sure that I don't fail SMOG (which I have been doing).

I have seen some threads that also talk about the bare minimum that is needed to make your rig run without any problems.
Thanks for posting this! I am swapping my motor out, and I dread having to get all that tubing right again. Just passed in December, so I know it is all there, just got to get it back in right! Looks just like your pics.
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post #22 of 56 (permalink) Old 03-19-2012, 09:35 AM
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Well, in Louisiana, as long as the lights and horn work, your windshield isn't too cracked and your windows aren't too dark, inspection is not a problem. Anyway, I know all adjustments must be made at operating temperature so the temp controlled vacuum switches shouldn't be much of an issue, right? So, as long as I have good vacuum to the distributor, brake booster and HVAC controls I'm good. Agreed?
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post #23 of 56 (permalink) Old 03-19-2012, 11:37 AM
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Originally Posted by Erichlg View Post
Well, in Louisiana, as long as the lights and horn work, your windshield isn't too cracked and your windows aren't too dark, inspection is not a problem. Anyway, I know all adjustments must be made at operating temperature so the temp controlled vacuum switches shouldn't be much of an issue, right? So, as long as I have good vacuum to the distributor, brake booster and HVAC controls I'm good. Agreed?
From what I have seen it is difficult to hybrid the smog/vac system. You either commit to getting rid of it all, including swapping the intake if it is EGR, or commit to putting it back together complete. People always think they can just plug the EGR port and all will be well, but then they can never get it tuned right.......
Those vac temp valves keep the system form running to rich at startup by preventing the excess fuel vapor from entering the carb till it is warm enough to not kill it.
Not sure what you are trying to do, but go one way or the other.
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post #24 of 56 (permalink) Old 03-19-2012, 12:58 PM
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Originally Posted by rossisnow View Post
From what I have seen it is difficult to hybrid the smog/vac system. You either commit to getting rid of it all, including swapping the intake if it is EGR, or commit to putting it back together complete. People always think they can just plug the EGR port and all will be well, but then they can never get it tuned right.......
Those vac temp valves keep the system form running to rich at startup by preventing the excess fuel vapor from entering the carb till it is warm enough to not kill it.
Not sure what you are trying to do, but go one way or the other.
Yeah! That's the kind of information I'm trying to get! I'll have to look at the pictures and labels that have been posted to determine which way to go. Thanks!
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post #25 of 56 (permalink) Old 04-15-2012, 07:15 PM
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does anybody know what the load control valve does? second set of pics I think. my old carb had a port on the back for it, but the new one does not. can I plug it?
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post #26 of 56 (permalink) Old 11-14-2012, 11:56 PM
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Any help where this goes, I took it off years back from the Passanger side. and now i dont know where it goes..
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post #27 of 56 (permalink) Old 11-15-2012, 01:09 AM Thread Starter
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Check post #8 above. Comes off air cleaner. Top picture.

'79 Bronco 351M 4 Speed Custom.
'79 Bronco. 400 C6 Custom w/AC.
'78 F250 400 Custom 4x4
'78 F250 460 C6 Camper Special
Check out my '79 Restoration Project...http://www.fullsizebronco.com/forum/...d.php?t=203050
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post #28 of 56 (permalink) Old 11-15-2012, 09:23 AM
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yo,
Electrical and Vacuum Troubleshooting Manual (EVTM), Partial for a 79 & F Series
Source: by Ziggy (topsig) at http://www.supermotors.net/registry/media/905065
here are some pages;
Vacuum Schematic in a 79
http://www.supermotors.net/registry/media/1032662_1

see pages 40 to 44

See my partially recovered Bronco web site ...Will need to clean up dead links & add many more new links some day. Thanks to Mr. Schwim!
THANKS to ALL WHO SERVE!

Last edited by miesk5; 01-02-2015 at 07:55 AM. Reason: NEW URL for Ziggy
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post #29 of 56 (permalink) Old 11-15-2012, 09:45 AM
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Quote:
Originally Posted by rossisnow View Post
does anybody know what the load control valve does? second set of pics I think. my old carb had a port on the back for it, but the new one does not. can I plug it?
Yo ROSSI.
Vacuum Vent Control Valve (LCV in some Vacuum Diagrams:, Also called the Load Control Valve (LCV);
D7TZ-9H301-A .. "T/E (Thermactor Emission-smog pump) Vacuum Vent Control Valve Assy" / Marked: D7TE-9H301-AA or D8TE-9H301-AA / Obsolete
http://www.rearcounter.com/D7TZ-9H301-A-parts75707.html

Applications: 1977/79 F100/350 & 1978/79 Bronco.
NOS Only
414 Umbarger Rd #E
San Jose, California 95111
800) 667-6659

--
Call Green Sales @ 1-800-543-4959 for current availability and pricing on Ford and Lincoln Mercury Parts
PART #: D7TZ9H301A
Description: . Alternate #: D7TZ-9H301-A, D7TZ*9H301*A

No other FoMoCo Dealer or obsolete parts vendor has any.

EGR SYSTEM WOT (WIDE OPEN THROTTLE) LOAD CONTROL VALVE

Some EGR systems feature a load control valve that closes the EGR valve when the engine requires maximum power at or near wide open throttle.

The valve is installed in vacuum line between the ported vacuum connection on the carburetor & EGR valve; vacuum line from carburetor venturi vacuum tap is connected to the top part on the WOT valve and provides control for the valve. When venturi vacuum is at a predetermined level near wide open throttle, it is strong enough to overcome the calibration spring pressure and unseat the diaphragm valve, diverting EGR source vacuum to the atmosphere and causing the EGR valve to close. Normal EGR flow is resumed when there is a reduction in engine load from the wide open throttle condition.

See my partially recovered Bronco web site ...Will need to clean up dead links & add many more new links some day. Thanks to Mr. Schwim!
THANKS to ALL WHO SERVE!
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post #30 of 56 (permalink) Old 11-15-2012, 09:56 AM Thread Starter
How did I get 6 Rigs??
 
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Here is a shot of my engine and where mine are:


'79 Bronco 351M 4 Speed Custom.
'79 Bronco. 400 C6 Custom w/AC.
'78 F250 400 Custom 4x4
'78 F250 460 C6 Camper Special
Check out my '79 Restoration Project...http://www.fullsizebronco.com/forum/...d.php?t=203050
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post #31 of 56 (permalink) Old 11-15-2012, 07:38 PM
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Quote:
Originally Posted by TNT89Bronco View Post
Here is a shot of my engine and where mine are:

Where does the one one the side of air cleaner goes. Cuz my air cleaner lid is like that.. that hose thats similar goes to the bottom of air cleaner and is original.
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post #32 of 56 (permalink) Old 11-16-2012, 09:53 PM Thread Starter
How did I get 6 Rigs??
 
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Here is a shot of the hose, with the air cleaner moved out of the way. Follow the red line....


'79 Bronco 351M 4 Speed Custom.
'79 Bronco. 400 C6 Custom w/AC.
'78 F250 400 Custom 4x4
'78 F250 460 C6 Camper Special
Check out my '79 Restoration Project...http://www.fullsizebronco.com/forum/...d.php?t=203050
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post #33 of 56 (permalink) Old 11-17-2012, 10:44 PM
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Quote:
Originally Posted by TNT89Bronco View Post
Here is a shot of the hose, with the air cleaner moved out of the way. Follow the red line....

Ok Thanks, I see where it goes now..
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post #34 of 56 (permalink) Old 01-07-2013, 12:29 AM
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Thank you... this is SO awesome..... replacing vacuum lines tomorrow and it will be so much easier than trying to follow the diagram under my hood!
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post #35 of 56 (permalink) Old 01-07-2013, 03:07 PM
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Need help finding TVV in vacuum diagram

Can't find an image of this part on the vacuum diagram; looks like it is in the far back of engine. Identified as thermostatic vacuum valve, but not sure what it looks like. Also Dual DV? Thanks
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post #36 of 56 (permalink) Old 01-22-2013, 02:27 PM
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I did a search first, that being said does anyone have the lenght and diameter for complete line replacement(78-351) info like the dress up kit including the long modulator line? I have seen it for later models in another thread. No flaming if you have the link that would be appreciated and I will gladly share pics when im done.
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post #37 of 56 (permalink) Old 01-22-2013, 02:43 PM
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Quote:
Originally Posted by miesk5 View Post
Yo ROSSI.
Vacuum Vent Control Valve (LCV in some Vacuum Diagrams:, Also called the Load Control Valve (LCV);
D7TZ-9H301-A .. "T/E (Thermactor Emission-smog pump) Vacuum Vent Control Valve Assy" / Marked: D7TE-9H301-AA or D8TE-9H301-AA / Obsolete
http://www.rearcounter.com/D7TZ-9H301-A-parts75707.html

Applications: 1977/79 F100/350 & 1978/79 Bronco.
NOS Only
414 Umbarger Rd #E
San Jose, California 95111
800) 667-6659

--
Call Green Sales @ 1-800-543-4959 for current availability and pricing on Ford and Lincoln Mercury Parts
PART #: D7TZ9H301A
Description: . Alternate #: D7TZ-9H301-A, D7TZ*9H301*A

No other FoMoCo Dealer or obsolete parts vendor has any.

EGR SYSTEM WOT (WIDE OPEN THROTTLE) LOAD CONTROL VALVE

Some EGR systems feature a load control valve that closes the EGR valve when the engine requires maximum power at or near wide open throttle.

The valve is installed in vacuum line between the ported vacuum connection on the carburetor & EGR valve; vacuum line from carburetor venturi vacuum tap is connected to the top part on the WOT valve and provides control for the valve. When venturi vacuum is at a predetermined level near wide open throttle, it is strong enough to overcome the calibration spring pressure and unseat the diaphragm valve, diverting EGR source vacuum to the atmosphere and causing the EGR valve to close. Normal EGR flow is resumed when there is a reduction in engine load from the wide open throttle condition.
Hey thanks miesk5! For some reason all my thread notifications were not showing up in the email. Just noticed. I bypassed the LCV and plummed straight to the egr since i didnt have the correct lcv port on my remaned carb... I am not sure what effect it has at WOT, but it seems to run just fine. It is so vague as to whether or not they are required, but you cant help but think having the EGR turn off at WOT is a good thing. Oh well.

I may be removing all of the smog stuff now anyway. I do not have to smog here unless I am going to sell.


Quote:
Originally Posted by Fox005 View Post
I did a search first, that being said does anyone have the lenght and diameter for complete line replacement(78-351) info like the dress up kit including the long modulator line? I have seen it for later models in another thread. No flaming if you have the link that would be appreciated and I will gladly share pics when im done.
Fox005

If you need something specific I could go out and measure it for ya. Let me know......Got family in GV. You know Chris Barrett?
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post #38 of 56 (permalink) Old 01-22-2013, 03:55 PM
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I dont know Chris but Ive only been here 3 years and work for Cal Craftsmen
I am trying to get a list and sizes to see if i need x amount of feet per size or if the kit has enough for the 2 miles of vacuum hoses, and everything is metric on the silicone dress up. Thanks ! I figured some guru would have that info here? If not I will post when Im done and have a list.
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post #39 of 56 (permalink) Old 01-22-2013, 03:59 PM
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When I redid some of mine from stock hoses at the auto parts store, they never seemed to be quite right. Figures they are metric or something.
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post #40 of 56 (permalink) Old 03-20-2013, 02:17 PM
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I got slammed this year by the AZ Emission guys. I guess the tech was brain-dead or poorly trained last year 'cause I passed without any Thermactor AIR equipment. They've upgraded the training and slammed me this year.

The AZ emissions Technician at the Waiver Station gave me this number of a guy in Fresno. He has complete kits for AIR and evaporative emissions parts.

1-800-544-4357

woolf

Anything that can go wrong, will go wrong. (Uncle Murphy)

http://s1184.photobucket.com/albums/...olfHoS/Bronco/
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