1990 Mercedes-Benz 300D Questions

All 1990 Mercedes-Benz 300D Questions

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Would like to know how to check the current and working condition of the glow plug relay before buying a new relay or new glow plugs. Plugs are 3 years old.
My interior light does not come on when when I open either door. The light does come on with the light switch. Is there more than one light in there and how do I get to the bulb(s)?
The car lost power when driving and was only going 5 mph. What may this be?
car smoke when frist starting. what can i do to stop from smoking
My MB is actually 82 It will start in nutral,could it be relay?
has no problem shifting thru 1st & 2nd but doesn't always hit 3rd. fluid level ok.
The pre-ignition rely/coil that sends the spark to the glow plugs fail to activate some times but it is totally random. Is there some way to activate it manually and/or reset it so it will work normally? Seem that i...
Oil sludge has been entering the coolant system for several years. Overheating has started. The coolant system needs to be thouroghly flushed and the gasket for the engine leak needs to be replaced. All of the hoses f...