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Old 01-07-2008, 01:17 AM
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Join Date: Sep 2004
Location: Seattle/ Hood River
Posts: 124
1985 280SL Ignition Failure Cause?

I recently purchased a non running 280SL. Its turned out to be the Coil & Ignition Control Unit were bad. At 1st, only the coil was bad, then after a short test ride, the Ignition Control Unit failed too( luckily just after returning to driveway). I've replaced both parts, after doing a spark test & following tests in the Haynes manual. Voltage at battery while running is at 13 volts. Is there something else probably wrong that I should be checking for, that might burn-up the new Coil & Ignition Control Unit? Or is this just an unusual case? My 280TE still has its original Coil & ICU after 370k miles

80 280TE- 5 spd, 15" BBS, W126 brakes,16mm rear sway etc
83 280TE- 5 spd
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Old 01-07-2008, 09:23 AM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Most likely caused by build-up of excessive resistance in the secondary ignition system.

IN other words. Bad wires cap, rotor, & or coil.

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