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DaveH 6/24/2010
1980 Mercedes Benz 280E Base 6 Cyl 2.8L - Engine
Vacuum controlled Ignition advance/retard system
How does one diagnose a problem with this system? (I have a very high idle rate and the vehicle feels as though it is not running smoothly when operated)

Where does one get replacement parts when a diagnosis is made?
1 Answer
  • colin
    colin 10/19/2012
    suck on the end of the vacumn pipe and the base plate should move ,now put your tongue over the end after sucking on the pipe and it should hold a vacumn .then test with a strobe light idle should be about 6degrees with the pipe disconnected then refit the pipe and rev the engine and should go up to around 22 degrees btdc .Sound like something else is wrong here as the vacumn advance will not affect a idle of around 800 rpm ,sounds more like a problem with the carbs

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