secondary vacuum

shauck · 12-09-06, 04:04 PM

First of all thanks for the help, low on $$ and lack of experience this forum is great. Gettn my vac dialed, does anyone know where my secondary vac could hook up to. Again 100% de-smogged and I will get a manual soon. THANKS

shauck · 12-09-06, 05:16 PM

Finally got it, hooked up my secondary to the intake manifold an walla its got some power. This being my first FJ didnt know what to expect heard a little slow. Bought it w/blown motor after rebuild my vacuum lines never hooked up correct. Slowly but surely getting it dialed. Thanks IH8MUD!!!!!!

Fuzzy Logic · 12-09-06, 06:01 PM

How does one hookup the secondary to the intake

shauck · 12-09-06, 06:07 PM

I took the vacuum line that comes off the intake manifold and hooked it up to the secondary on my carb.

kevinmrowland · 12-09-06, 06:44 PM

hum????
I have a feeling that may be the choke breaker.
The vacuum port for the secondary is internal.

Fuzzy Logic · 12-09-06, 06:55 PM

Also

shauck · 12-09-06, 07:52 PM

probably correct so did i hook it up correct

kevinmrowland · 12-09-06, 08:12 PM

well, yeah, I guess you did

The choke breaker is supposed to get vacuum from the manifold, well done. Now about the secondary............

Fuzzy Logic · 12-09-06, 08:13 PM

secondary diaphragm

shauck · 12-10-06, 07:37 AM

Perfect! Okay my carb looks a little different. The two vaccum gold mechanisms (on the right) I have but my seconday diaphram has another gold mechanism just above it with a vacuum coming out and that is what i hooked to the manifold.

brian · 12-10-06, 09:14 AM

Quote:

Originally Posted by shauck

Perfect! Okay my carb looks a little different. The two vaccum gold mechanisms (on the right) I have but my seconday diaphram has another gold mechanism just above it with a vacuum coming out and that is what i hooked to the manifold.

where in the world are you located?

Heartworm · 12-10-06, 09:35 AM

Kevin: I thought the choke breaker got vacuum from a little port on the upper front of the carb. The vacuum hose runs to a VTV and then to a diaphragm on the rear driver's side of the carb. Page 3-40 in Emissions Manual. Perhaps there are different arrangements.

kevinmrowland · 12-10-06, 09:49 AM

Quote:

Originally Posted by Heartworm

Kevin: I thought the choke breaker got vacuum from a little port on the upper front of the carb. The vacuum hose runs to a VTV and then to a diaphragm on the rear driver's side of the carb. Page 3-40 in Emissions Manual. Perhaps there are different arrangements.

Yes, but i think we are dealing with a desmog here.
In both cases the choke breaker eventually just gets vacuum from the manifold (makes sure the choke is open just enough for the engine to run)

(edit: through a one way vacuum valve, VTV, to prevent the opposite happening in the event of a backfire)

kevinmrowland · 12-10-06, 09:50 AM

Quote:

Originally Posted by shauck

Perfect! Okay my carb looks a little different. The two vaccum gold mechanisms (on the right) I have but my seconday diaphram has another gold mechanism just above it with a vacuum coming out and that is what i hooked to the manifold.

That means you hooked vacuum up to your AC idle up diaphram, just opens the throttle a bit more.

shauck · 12-10-06, 12:01 PM

I am in Breckenridge Colorado 9,500 above sea level and my carb (do not know the diff between smog and un smog carb) has 3 brass looking round plungers that all have vacuum hook ups. After reading above threads went to my idiling FJ and revved it up by hand and the secondary linkage did not move.

Just I guess the a/c vacumm that is hooked up to my intake manifold.

brian · 12-10-06, 01:01 PM

Quote:

Originally Posted by shauck

I am in Breckenridge Colorado 9,500 above sea level and my carb (do not know the diff between smog and un smog carb) has 3 brass looking round plungers that all have vacuum hook ups. After reading above threads went to my idiling FJ and revved it up by hand and the secondary linkage did not move.

Just I guess the a/c vacumm that is hooked up to my intake manifold.

i really doubt you'll get into the secondary with no load on the motor.

kevinmrowland · 12-10-06, 01:25 PM

yeah, as brian said, that is not an effective test of the secondary, it opens at pretty high vacuum (around 2600 rpm under load) And has no bearing on wether the motor idles well or not (unless, I suppose, if it was somehow stuck open)

You can manually test it with the carb disassembled and that will be explained in your new manual which is hopefully in the mail.

I have since forgotten what It was that we were trying to solve here?

Your truck is now idling with the ac idle up connected to vacuum?
Seems like it has a vacuum leak or not enough fuel.
Have you adjusted the idle mixture screw? Not the idle speed screw on the side of the carb, the mixture screw on the aircleaner side of the carb near the main vacuum ports.
Disconnect the ac idle up.
Adjust your idle SPEED screw to get it to run. (on the back face of the carb, towards the drivers seat) This will basically accomplish the exact same thing as the ac idle up, just the right way.
Connect the choke breaker(top right in the pic above) to manifold vacuum.
Connect the spark advance diaphragm on the dizzy to the carb port as brian described.
Hook up a vacuum gauge to the manifold and if it reads below 17hg start spraying carb cleaner on every possible vacuum leak until you hear the engine rev.

Good luck,
Kevin R.

shauck · 12-10-06, 01:46 PM

So you know my FJ runs pretty good. Just starting on cold mornings (3 degrees) very difficult. just to re-iderate

1. One vacuum line from upper rt diaphram to intake manifold. Do I leave the green and white valve hooked up between??

2. As descirbed vacuum line at base of carb closest to firewall to dist advance(closest to dizzy).

3. Plug all other vacuum on carb including the 2 other gold diaphrams.

I am not going to mess with mixture yet because my FJ runs good even at 400rpms

kevinmrowland · 12-10-06, 01:59 PM

Quote:

Originally Posted by shauck

So you know my FJ runs pretty good. Just starting on cold mornings (3 degrees) very difficult. just to re-iderate

1. One vacuum line from upper rt diaphram to intake manifold. Do I leave the green and white valve hooked up between??

2. As descirbed vacuum line at base of carb closest to firewall to dist advance(closest to dizzy).

3. Plug all other vacuum on carb including the 2 other gold diaphrams.

I am not going to mess with mixture yet because my FJ runs good even at 400rpms

1. Leave the VTV in place, as long as air can flow toward the manifold, if not then it got turned around.

2. I think so, can not remember off the top of my head. It will be the one that has no vacuum at idle and then gradually increases along with the rpms.

3. No, if you have AC the AC idle up needs to be connected to the VSV for the ac, (I think it is the green plug with 2 round internal connecting pins, easy to test, turn on AC and see what plug gets power, as long as the engine rpms are high enough to activate the ac circuit, if not turn the little blue knob on the under dash AC unit all the way counter clockwise to allow the AC to kick on at the lowest possible engine speed..........ok, so maybe not that simple)
I can not remember what the lower right diaphram does, something with emissions, I have a non US (3f) carb so I do not have that one anymore, I am not sure if you can plug that one.
If I remember, I will bring my emissions manual in from the truck later and check on that one.