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Old 01-14-2004, 11:06 AM
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Join Date: Jun 2002
Location: Northeast
Posts: 231
Glow Plugs

Quick question:

Glow plugs do they deteriorate (sp) over time like spark plugs or do they just die and they are done.

Thanks in advance,

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Old 01-14-2004, 11:14 AM
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Join Date: Aug 2002
Posts: 1,855
Yes they do wear out the resistance in the filament nears infinity which is what it'd be if the filament were broken. A rough test is to check the GP resistance with respect to ground, it should be from .6-1ohm of resistance. Also only replace with bosch, autozone is the cheapest place for them so I hear.
Jeff M.
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Old 01-14-2004, 12:16 PM
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Join Date: Jun 2002
Location: Northeast
Posts: 231

I lost my 81 300d in an accident and I bought an 83 300d. I just replaced the plugs in the '81. I thinking about switching them, since i just bought them.

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