Author Topic: Vac plug of some kind missing?  (Read 566 times)

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Offline ALFox

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Vac plug of some kind missing?
« on: September 18, 2019, 10:40:04 pm »
Can anyone clue me into what this is? I noticed a “sucking” noise this morning after about half a mile and this hole is sucking in a whole lot of air.

Thanks for any insight you can provide!

‘69 Mach 1 428SCJ. “W” Code.

Offline DragPack69

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Re: Vac plug of some kind missing?
« Reply #1 on: September 19, 2019, 06:24:23 am »
Looks like your missing a nipple off that vaccuum block, should have 2 off the back

John
68 1/2 auto cj
69 4 speed scj

Offline Vcode

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Re: Vac plug of some kind missing?
« Reply #2 on: September 19, 2019, 06:31:37 am »
Check the hose the nipple may still be there.

Bill sells the fitting.
http://mansfieldmustang.com/EnginePCV.html (p/n C8OZ- 9A474-B)

http://mansfieldmustang.com/04-01b.jpg
'69 Mach 1 SCJ

Offline v159hill

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Re: Vac plug of some kind missing?
« Reply #3 on: September 19, 2019, 08:48:17 am »
Might check the hollow stud that is on the left rear of the carb mount. Have seen that cap missing and suck air.

Offline Jiffy

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Re: Vac plug of some kind missing?
« Reply #4 on: September 19, 2019, 08:59:46 am »
If you can't find the nipple, find a way to block the hole.
Epoxy putty, remove, drill and tap etc

Offline ALFox

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Re: Vac plug of some kind missing?
« Reply #5 on: September 19, 2019, 10:44:19 am »
Thanks all, I’ll take a look around and see if I can find it. May have shaken loose in the driveway. If not, I’ll order another.

Anyone have a picture of theirs?

Is there a hose that goes to that fitting, or is it just blocked off like the one beside it?

Offline rockhouse66

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Re: Vac plug of some kind missing?
« Reply #6 on: September 19, 2019, 11:06:05 am »
On a shaker car, one nipple is for the vacuum motor. On a Q code, both are blocked off.  I suppose there might be some other options that get vacuum from here, like maybe tilt wheel or power ventilation or something?  Not sure about that.
Jim

'69 Grande CJ

Offline Kascus

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Re: Vac plug of some kind missing?
« Reply #7 on: September 19, 2019, 03:24:49 pm »
Check the vacuum line going to the trans if you have a automatic.
1968.5 Mustang 8R02R161155
1964.5 Mustang D code coupe
1965 Shelby SFM5S561 (past)
1966 Mustang FB (past)
1969 Mustang FB (past)

Offline ALFox

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Re: Vac plug of some kind missing?
« Reply #8 on: September 19, 2019, 03:45:37 pm »
It’s a 4-speed. I’m thinking both nipples were plugged, but still not 100% sure.

Offline ALFox

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Re: Vac plug of some kind missing?
« Reply #9 on: September 20, 2019, 01:23:13 am »
Ran a search pattern and found it in the road.  :o

Offline Chev

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Re: Vac plug of some kind missing?
« Reply #10 on: September 20, 2019, 03:27:10 am »
vacuum hose set is available from deadnutson (77USD) and marti (20USD). Both claim theirs is correct, difference is glossy vs matte ink. Hose with blue ink goes from one port on the small fitting to the rear of shaker. The other one is plugged.
Do you have PS? Else you also need to connect a vacuum line to the threaded port on the small fitting, and then a "Gates" vacuum hose to the brake booster. (both available from deadnutson)

I also noticed that you engine gauge harness is hanging on a cable tie off the throttle cable. Correct routing is through 3 cable clips inside of valve covers.
Its too easy to overtighten those bolts, torque 4-7 ft-lb.

/Chev

Offline ALFox

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Re: Vac plug of some kind missing?
« Reply #11 on: September 20, 2019, 11:31:45 pm »
vacuum hose set is available from deadnutson (77USD) and marti (20USD). Both claim theirs is correct, difference is glossy vs matte ink. Hose with blue ink goes from one port on the small fitting to the rear of shaker. The other one is plugged.
Do you have PS? Else you also need to connect a vacuum line to the threaded port on the small fitting, and then a "Gates" vacuum hose to the brake booster. (both available from deadnutson)

I also noticed that you engine gauge harness is hanging on a cable tie off the throttle cable. Correct routing is through 3 cable clips inside of valve covers.
Its too easy to overtighten those bolts, torque 4-7 ft-lb.

/Chev

Chev, thanks a lot for the info. I don’t have power steering, but when I got the car, both nipples were plugged.

I’ll take a look at that routing and get it sorted. Thanks again!

Offline rhjanes

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Re: Vac plug of some kind missing?
« Reply #12 on: September 21, 2019, 09:02:02 am »
I believe Chev actually meant Power Brakes.  The large threaded port is to supply vacuum over to the power brake booster.  Original power steering, won't use vacuum.
However if you have AC or tilt away steering wheel, they DO use those small vacuum lines to connect over to some vacuum canisters (so there is some vacuum even when the car is shut off).
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Offline Vcode

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Re: Vac plug of some kind missing?
« Reply #13 on: September 21, 2019, 02:55:44 pm »
Power Vent also used vacuum.
'69 Mach 1 SCJ

Offline ALFox

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Re: Vac plug of some kind missing?
« Reply #14 on: September 22, 2019, 04:48:31 pm »
Gents,

Thanks for all the info. Both nipples were capped off when I got the car.

Am I correct in saying that the larger nipple (closest to driver's side) is blocked off, and the smaller nipple (passenger side) is connected to the rear Ram Air via a Blue-inked Vac hose?

To keep it concourse, is the PCV Intake Fitting supposed to be painted blue? If so - where can I find that blue paint?

My car is non-PS, non-PB, no AC.

« Last Edit: September 23, 2019, 01:49:16 am by ALFox »