Chip ;
Look at the various colored (? Ethnically Diverse ?) plastic vacuum pipes where they come out of the firewall in a bunch ~
Green is for the HVAC .
Yellow is for the Central Locking system , cap it off for now .
Brown (there's two) is for the engine shutoff , they both go to the key switch and you'll prolly find the 1" long rubber hose bits that connect the brown pipes to the back of the key switch under the dashboard , are soft & blubbery , easy to pull off , this won't work so _CAREFULLY_ replace them both as well as any other short bits of rubber hose you find that connect the various plastic pipes .
Blue is for the automatic seat back locks, they're bad so cap them off and forget about them for now .
Some years have a black plastic pipe connected to the yellow two way vacuum valve near the brake booster , if so it goes to a vacuum resivoir inside the driver's side fender where you cannot see nor touch it without removing the fender ~ it takes a _LOT_ of vacuum to fill this resivoir so don't just cap it off until you're _sure_ it's leaking & not holding vacuum .
The other brown plastic pipe connects to the back of the injection pump , _CAREFULLY_ disconnect it then add a long bit of NEW vacuum hose to the IP , start the engine and apply vacuum to the open end of the hose (I just suck on it) , the engine should *immediately* shut off ~ if not , or if the IP's vacuum chamber doesn't hold vacuum , you've found out why it doesn't shut off , that part (hard to find new these days) will need replacing before your engine will ever shut off with the key .
By taking the time to slowly check all these and repair leaks and old hose bits and by pass the seat locks & central locking , you should be able to get firm shifting and nearly *instant* engine shutdown .
-Nate
Chip wrote:
>
> I have been at it all day on my vacuum system and may have fixed a couple of things. The vacuum line replacement with new rubber is certainly a lot of fun on the transmission modulator. Is there another vacuum hook up to the transmission other than this one?
>
> On to other issues. Check valves, I don't have two but three. My first is a green valve that then branches out to two yellow valves, one with 1 outlet, the other with two. If the green one is a check valve, it is bad. The two prong yellow check valve is the one that supports the yellow line and the yellow and black line. The one feeding the vacuum tank is holding vacuum, the other leaks down quickly. I have not gotten into my drivers side door to sort that one out.
>
> I have a Auto Zone knock off to replace the green check valve one I confirm from this board that it is indeed a check valve. I'll order the correct part after I figure out from you guys what it is.
>
> And then there is the blue line, what does it do? And which one is the one that shuts down the ignition. That's the one that I most need to find. I am not able to shut my car off at all anymore unless I open the hood, and even then it is very difficult to get it stalled.
>
> If someone here could point me to a good post or sight that goes through all of the vacuum line diagrams that would be great.
>
> Thanks in advance to some references or help; beyond just the door lock system. I have Tom's book on door lock repair and I think I can get that part in hand.
>
> Chip
> Houston
>
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