[Commuter]

1984 300TD

The vacuum system works good. Good brake and locks work fine. One thing that bugged me is that it took what seems like a long time for the engine to stop after the key is turned off. About two to three seconds. It shakes bad during this time.

I pulled a vacuum reservoir tank off a gasser and installed it and a check valve as close to the vacuum switch on the ignition as possible. The engine now stops nearly instantly. About a half of a second. Much nicer.

How long should it take to shut down?

Am I compensating for another problem or have I made a design improvement?

 

[codepony]

Mine used to take a couple seconds to shut down. Almost instantly now since I did a valve adjustment and fixed a vacuum leak.

 

[DRVN2WN]

Am I compensating for another problem or have I made a design improvement?

Compensating for another problem. You probably have a leak in the line that affects shut off, and it's somewhere further back than where you tapped in to install your new system.

 

[ichris93]

Do you have an automatic transmission? Check the 3/2 way valves on top of the valve cover for leaks!

 

[Commuter]

Do you have an automatic transmission? Check the 3/2 way valves on top of the valve cover for leaks!

That was to be another post. This car should have those valves but they were missing when I got the car. The plumbing for it is gone too.

Refresh my memory: What do the valves do?

 

[ichris93]

That was to be another post. This car should have those valves but they were missing when I got the car. The plumbing for it is gone too.

Refresh my memory: What do the valves do?

If they're are missing your vacuum system may be connected improperly where it is venting to the cabin all the time.

There is some debate on the purpose of the valves. Some say it is strictly for the EGR. Some say it's for the tranny and the EGR. I, for one, would like to know if they are necessary. Currently I have mine disconnected.


Sent from AutoGuide.com Free App

 

[MBeige]

It should shut off instantly.

 

[Commuter]

The 85 Cali coupe has the same delayed shut off. I don't remember the 85 sedan having this issue.

 

[Gregs300CD]

Listen to Pat. With no leaks in your vacuum system, it should shut off quickly.
In my 83 (with bypassed ACC) the car shut off IMMEDIATELY.
In my 82 with all systems running, it takes maybe a quarter to a half second.

 

[300Dman]

That was to be another post. This car should have those valves but they were missing when I got the car. The plumbing for it is gone too.

Refresh my memory: What do the valves do?

Everything I have read on the Forums has that the 3/2 way valves are there to control the EGR Valve. At least on My Year and Model.

They only become an issue to other Vacuum Components like the Transmission when they become a source of a Vacuum leak.

A lot of People remove the Valves and the related lines also because they do not want the EGR to Function while at the same time eliminating a possible source/s of a Vacuum Leak.

 

[Rmac58]

I have removed my 3/2 valve, should shut off instantly, as mentioned.

Numerous vac leaks plage these cars. Check to see how much vac (inHg), need ~7.

Pull the brown/violet line from the shut off actuator, is there oil? If so, replace the shut off actuator.