In the W123 85 Cali vac diagram, can I bypass number 84 and 81? It seems they do little more than EGR stuff. I have a severe vacuum leak at both of these components somehow, and I'm wondering if they're even necessary.

__________________
'90 300SE --- 173k miles --- (Odometer just stopped working!)

'85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10

'82 300TDT --- 236,xxx miles --- (My first one) Sold July '09

#84 and #81 can be removed provided you remove and re-route the related vacuum lines accordingly.

__________________

They're just for EGR, right? Do they serve any other particular purpose? I don't want to hurt another system in bypassing these things.

__________________
'90 300SE --- 173k miles --- (Odometer just stopped working!)

'85 Cali 300D --- 193500 miles --- (Second one) Sold Nov '10

'82 300TDT --- 236,xxx miles --- (My first one) Sold July '09

I've removed them both. If you trace the vac lines that come from them, you'll see they receive signals from other important elements that should not be removed, but send signals only to EGR and the ARV.

__________________

Mine are in a box in the garage someplace along with the EGR valve itself. No loss, the left inner fender is cleaner, and there are fewer places to have a vacuum leak.

__________________

"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970