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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 10-04-2007   #1 (permalink)
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Default 1977 Mustang 302 Vacuum Hose Issues. Graphic Inside.

Hi Everyone -

First off, THANK YOU to everyone who helped -- especially since this is the classic forum (I think it's time to let the IIs into the classic party, no?).

I've done a lot detective work and have made the following diagram of how it is now.

Keep in mind that the car does indeed shift like doo doo - and it will be clear why when you see the diagram I made (click link).

1977 Mustang 302 Vacuum Hose Issues. Graphic Inside.-cobra_mustang_vacuum_diagram.gif

I think the root of this issue may be simple. Before I took the carb off, I made careful note where the tubes went. The yellow one to the base of the carb wouldn't come off so I disconnected it on the other end (mistake #1). While I have no recollection of disconnecting the Tranny hose, I must have due to the before-and-after shifting difference. I may have reconnected the yellow hose to where the tranny hose should go and then simply omitted rehookin the tranny hose out of memory lapse.

DOES ANYONE SEE A SOLUTION HERE? HOW IT 'SHOULD' BE?

Does anyone know what that small vacuum tree is that has one fitting to the EGR? Someone said it may be a switch. See photo.

Thanks to you all in advance.

Christian
Attached Thumbnails
1977 Mustang 302 Vacuum Hose Issues. Graphic Inside.-smalltree_sloseup.jpg  1977 Mustang 302 Vacuum Hose Issues. Graphic Inside.-bklyncobra.jpg  

Last edited by ScottHalliday; 10-05-2007 at 09:38 AM.
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Unread 10-04-2007   #2 (permalink)
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Okay,

It shifts like poop and the metal line to the tranny is disconnected. There's the problem! There is a metal line between the vacuum modultor valve on the transmission and the vacuum source. In the case of my old '66, this is an intake vacuum source. I have since added power brakes, so the vacuum line was replaced with a vacuum fitting, with fittings for the PB booster and trans. modulator line. This metal transmission line needs to be hooked up to an intake vacuum source. I am looking at your diagram; is this small vacuum tree on the intake? If so, perhaps that is correct. However, I would lean towards using the tree that the PB booster uses.

Even a slight leak in the modulator line will cause shifting issues.

As for the heater valve, the vacuum for that is sourced from the heater controls inside the car. From the controls, there should be a vacuum source coming from inside the car to the engine, possibly on that small tree?

I think the grey line from the distributor should go to the carb. The yellow line from the carb to the booster lg tree doesn't seem right.

Oh, what a can 'o' worms!


To sum it all up: unhook yellow at lg tree and replace tranny line to lg tree. Hook dist to carb.

This is based on what I know about old cars, if I'm wrong I'm sure someone will let me know
Michael
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Unread 10-04-2007   #3 (permalink)
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Oh, and I think that II of yours is a wicked sweet ride.

And yes, she's a classic!
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1990 GT 25th Anniversary 5.0 AOD Convertible. SOLD
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