Question about 1989 Mercedes-Benz 300-Class

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Car will stall after running about 15 minutes no electrical sparks from plugs

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I have brought a 89 300 se also. What I have run into with this problem is it's the after burner or pre-catalyst. It's at the bottom of the engine. The smartest thing to do is see if you can run a diagnostic on it before you do anything. Good Year and many other companies are always running specials on this.

Posted on Jul 20, 2009

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Without further information this is going to have to be a educated guess based on a lot of experience, but my prime suspect would be the ignition coil. In use they do heat up and when they overheat the internal insulation breaks down and no high tension current is produced to generate sparks. Typically the engine starts to misfire and it rapidly gets worse until the engine stops.

If the car starts again after about half an hour to an hour (or you can considerably speed up the cooling of the coil by running water over it for a few minutes) then it makes the diagnosis near certain.

Most modern coils are filled with dry resin instead of transformer oil and are far longer lasting and more resistant to overheating.

Posted on Jul 16, 2009

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