'84 300SD glow plug problem

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'84 300SD glow plug problem

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Mercedes Forums >> Mercedes Benz Models >> Diesel Discussions >> '84 300SD glow plug problem

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'84 300SD glow plug problem - 5/21/2007 10:35:48 AM

digi

Posts: 11
Joined: 12/3/2006
Status: offline

My glow plug light began about a month ago not coming on until I intermittedly played the ignition switch on and off several times.
Then it would stay on each time during that cycle until the engine started; but started with difficulty and initial blue exaust.
Have 198K miles on and never had any starting problems..(granted I plugged in if below freezing.)
As of yesterday the light does not come on even with prodding. Very difficult start now unless I preheat (plug in); even at 55 degreesF
.A hot engine always starts well as before.
The strip fuse is fine.
I did an ohm test on the wires in the terminal and got 0 readings on 1 and 5;
and no continuity at all on 2, 3,and 4.
Thanks for any discussiion re this problem.
PDG

Post #: 1

RE: '84 300SD glow plug problem - 5/23/2007 4:51:08 AM

digi

Posts: 11
Joined: 12/3/2006
Status: offline

I replaced # 2,3,and 4. Light comes on...car starts up normal.....my question now is should I replace plugs #1 and 5; with the enemy of good being better?
Any comments appreciated.
PDG

(in reply to digi)

Post #: 2