Quote:
Originally Posted by christuna
On you car it's done by a servo motor that's right next to the power steering pump. And cutting out is a sign of cruise ecu going bad (bad caps and cold solder joints I have a diy link if you want)
On a W123 with OM617a an engine driven vacuum pump does:
1. engine shutoff
2. brakes
3. central locking (no separate electric pump like in a w126)
4. automatic transmission shifting (VCV simulates vacuum so it's like in a gas engine)
5. egr
6. climate control pods
so as you see there is a huge potential for leaks
If you test your vacuum pump by itself it should be making minimum 15 inches of vacuum
I would start by testing other systems with a mityvac
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Great info, thanks. I really want to get on top of the vacuum issues, I just needed to get to greater priorities.
What you say about the CC makes sense. The vacuum is too inconsistent to operate the CC as well as it works. I would like that DIY link. Won't get to it for a while. If it went completely south I'd proably get to it quicker.
