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1984 500 SEC
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57 Posts
Discussion Starter #1
I'm pretty sure my car does not have one of these. I've searched long and hard for a photo but cannot find one anywhere on-line. And there isn't a obvious candidate under the hood waiting for a vacuum line to be attached. Assuming that I don't have a vacuum switch, do I need to block up port B on the throttle housing or can I just leave this unconnected?
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1991 500SEC 50K mi. 1987 560SEC Now 153K mi. 2020
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4,392 Posts
The M117.963 engine vacuum system is pictured in this diagram. The central 'figure' there I take to be the throttle body and there are a lot of vacuum fittings..
I have a feeling that port serves a purpose.

MBL

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Registered
1982 380 SEC A/T Euro
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139 Posts
It seems like you have a 1984 500 SEC. Then you probably have the throttle position switch. Post May 83 models were produced with these instead of Port B.

Are you sure your car has port B?

Image #3 on post #12 in this thread shows it and how the throttle position switch looks

 

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Registered
1984 500 SEC
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57 Posts
Discussion Starter #4
That's really helpful. I am indeed not sure if I have a port B as I haven't taken off the air intake boot yet. I was trying to get a clear idea of what is required before I start the job. If I have the correct throttle body for the car then I imagine it should be fine, but as this car had a 117.960 engine installed by the PO sometimes I never know what I will find! I'll revive this thread if I need more help. Thanks
 

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Moderator
1991 500SEC 50K mi. 1987 560SEC Now 153K mi. 2020
Joined
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4,392 Posts
That's really helpful. I am indeed not sure if I have a port B as I haven't taken off the air intake boot yet. I was trying to get a clear idea of what is required before I start the job. If I have the correct throttle body for the car then I imagine it should be fine, but as this car had a 117.960 engine installed by the PO sometimes I never know what I will find! I'll revive this thread if I need more help. Thanks
Oh yes! I had forgotten that nuance... You are absolutely right.

Here are parts blow-ups of the M117.960 vacuum system for reference.

M
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