Quote:
Originally Posted by cmac2012
It might be. The vaccum issues are hard to figure. Sometimes the door locking works, other times not. Sometimes the engine will turn off right away, other times not. The cruise control mostly works well, I should amend that. About once a half hour it will suddenly cut out completely. As if you just took your foot off the pedal. I've gotten in the habit of being ready to use the foot immediately, is quicker than resetting the CC, but it will reset and work again just fine until the next drop off. I can only guess it suddenly loses vacuum in those episodes.
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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)
Quote:
Originally Posted by cmac2012
Saints be praised, I pulled it off. Will install new stuff soon. The punchline is, for the brief spell I've driven it since, I hooked my mighty vac up to the igntion shut down line. Oh man, that engine shuts off right now when I squeeze the handle. I've GOT to improve vacuum.
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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