- Thread starter
- #21
I am using that guide as well but it is slow going, it all makes no sense to me! Bit by bit it is becoming clear, I hope I can get it back running this week.
De-Smog Help (2 Viewers)
- Thread starter HitTheDirt
- Start date
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I am using that guide as well but it is slow going, it all makes no sense to me! Bit by bit it is becoming clear, I hope I can get it back running this week.
- Thread starter
- #22
Yep I was using your guide because you were running the HAC, but then I realized the lowest I would be going is MOAB at 4000ft. So I think I will leave that off. But yeah I need to re-read it all again, I want to make some progress tonight!
- Thread starter
- #23
A bit more progress tonight- routed the heat riser hoses and then what I think is correct to the EGR blockoff plate?
The only thing that should go in your EGR blockoff plate is PCV. I don't know the MAF part (I just welded a bolt into the EGR side of mine) and I can't tell too well from the last photo, but it looks like you might have the EVAP line from the firewall plugged into yours instead of PCV hose (which is supposed to go into the carb insulator).
@HitTheDirt i see in post #5 on the thread you still have (had?) the AC idle up vacuum switch. If you're keeping that, it connects to the smaller prong on the fitting on the firewall side of the intake manifold (the larger is for the hose running to the brake booster) and you'll need intake vacuum to run to the distributor, so will have to unplug your gas filter fitting, put the gas filter back in with 2/3 plugged and use the other port for getting vacuum to the distributor.
But if you're not keeping AC idle up, as @mwebfj60 pointed out, you can pull intake vacuum from the smaller port on the fitting and keep the front.
Let me know if you want to talk live or see pics from my desmog. It's pretty fresh for me since I just completed it. I'm happy to help as others have helped me.
- Thread starter
- #27
OK great, thanks! Getting closer now to figuring this out with all the help on here.
So:
-EVAP line from firewall to single fitting on the carb insulator plate
-PCV line from passenger side block to EGR blockoff
-Brake booster hose to larger of the two fittings on the intake port with heat sink rings on it
-AC Idle Up (keeping that) to smaller of the two fittings on the intake port with heat sink rings on it
Gas filter is cleaned and going back in tonight.
-One port to distributor
-Other port to HAC?
Also where does the other AC idle up line go to?
So:
-EVAP line from firewall to single fitting on the carb insulator plate
-PCV line from passenger side block to EGR blockoff
-Brake booster hose to larger of the two fittings on the intake port with heat sink rings on it
-AC Idle Up (keeping that) to smaller of the two fittings on the intake port with heat sink rings on it
Gas filter is cleaned and going back in tonight.
-One port to distributor
-Other port to HAC?
Also where does the other AC idle up line go to?
- Thread starter
- #28
I might take you up on that! Will be working on it every night this week till it's done.
- Thread starter
- #29
Ok back in the weeds!
A couple questions-
Is the hose off the firewall to the large port to the right of the the green electrical connection correct?
Then I cannot figure out which of the switches on the drivers fender is the AC idle-up, there are 4 that look the same to me. Then do I need the other 3?
A couple questions-
Is the hose off the firewall to the large port to the right of the the green electrical connection correct?
Then I cannot figure out which of the switches on the drivers fender is the AC idle-up, there are 4 that look the same to me. Then do I need the other 3?
My AC idle up has this connector...wiring looks to be yellow/green and blue/black.
You don't need the others (except for the decel) but don't throw them away.
You don't need the others (except for the decel) but don't throw them away.
Also, don't run manifold vacuum to the distributor advance diaghragm, that needs to be ported vac off the carb. You DO run manifold vacuum to the VCV (under aircleaner) port S, that vents the distributor.
You probably already know this but circled is the decel.
- Thread starter
- #33
No I was just going to ask that, thanks! Where does that decel line run to? Looks one of the ports on the carb on your drawing.
*edit- got the decel input to the carb, top left port facing the head, shown in pic below
Also, what is the switch right above the decel in your last pic?
*edit- got the decel input to the carb, top left port facing the head, shown in pic below
Also, what is the switch right above the decel in your last pic?
Last edited:
Red circle: HAC switch (my design not common)
White circle: AC idle up
Blue circle: Decel
White circle: AC idle up
Blue circle: Decel
- Thread starter
- #35
Ok Thanks, got some more questions.
-What/where is the primary vac advance?
- which AC idle-up line goes where? (See pic)
-what goes into the gas filter 3 prong? Might just need to re-read my own thread for that one.
-What/where is the primary vac advance?
- which AC idle-up line goes where? (See pic)
-what goes into the gas filter 3 prong? Might just need to re-read my own thread for that one.
Primary advance is the one closest to the cap.
The AC idle up line from the manifold goes to the outside port on the switch (the one that holds vacuum when there's no power to it). The one from the carb diaghragm goes to the other that doesn't hold vacuum with no power.
- Thread starter
- #38
Ok does this look correct on the ac idle setup?
Normally you'd pull vacuum for the AC idle up to the smaller fitting on the back side of the intake manifold (adjacent to the brake booster vacuum port) instead of the gas filter/front side of intake manifold, but the setup pictured is essentially identical in terms of functionality.
The large hose you mention is the other EVAP hose that runs to the carburetor. It looks correct but I've got a Trollhole carb and can't cross reference my own engine to be sure.
