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Old 01-07-2020, 02:58 AM
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Join Date: Feb 2019
Location: CA
Posts: 137
Remove EGR Computer

Putting my 85 300CD back into shape. The EGR computer is shot, so I am jumping the EGR connector to power the tachometer. May as well remove the EGR valve since it isn't going to be activated anymore. I am also removing the trap oxidizer because I don't trust it for the long term

So my question is, what else can I remove to clean up the engine compartment since the EGR is going away? I was especially curious about the round diaphram on the turbo that is activated by vacuum. It has some sort of vacuum controller shared with the EGR vacuum supply.

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Old 01-07-2020, 10:18 AM
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Join Date: Apr 2004
Location: Chicago
Posts: 198
These two posts might be helpful.

1985 300D vacuum crazyness.

1985 CA 300D- Newly bought, need help big time

The first contains a thumbnail suggesting what to remove. The second contains a nicely color coded vacuum line thumbnail.
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Old 01-10-2020, 10:04 PM
ykobayashi's Avatar
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Join Date: Jun 2005
Location: Irvine, CA
Posts: 737
That was a great post. I used those diagrams to delete my EGR and all the vacuum lines and other nonsense. I went a little further and removed the vacuum amplifier (flying saucer) and routed my vacuum from my VCV right down to my trans. I fine tuned the vacuum with an orifice that I found in the mess of vacuum lines I removed...mostly because I was too lazy to remove the little cap off the VCV adjustment screw.

I also took off the funny vacuum line to the turbo. I forgot what that one was called but it didn’t need it. ARV? Maybe.

The car runs beautifully and is easy to understand. I got a nice supply of plastic vacuum hose and tees to tinker with as well.

Good luck.

79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 250k miles
85 300D Turbodiesel 165k miles
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