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#1
09-08-2005, 10:59 AM
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No glow plug light = bad timer?
One of the issues that I have with my '87 300D is that the glow plug light doesn't go on. It does warm up and I have checked to see if current is getting to the plugs and it does. I've checked the timer according to the FSM and by what I conclude the timer is bad. Is the light that important? I can hear the timer click off after about 20 seconds or so. Should I bother changing the timer?
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012 
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#3
09-08-2005, 01:40 PM
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That was the first thing I checked.
 Bulb was good.I even checked to see if the was a short in the wire and it was fine. The FSM has a series of checks to do and I followed them. According to the FSM I would have to replace the timer. I'm wondering if there is a way to fix it?
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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#4
09-08-2005, 03:49 PM
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On the '87 no light means a couple of bad plugs.
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www.jerseyplanning.com 1987 300TD 440K - My car 2005 Jeep Grand Cherokee Laredo 107K - Tim's car 2000 - CLK320 100K - Deb's car 1994 C230 150K - Josh's Car Last edited by jfikentscher; 09-08-2005 at 03:55 PM.
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#5
09-09-2005, 10:34 AM
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I would have never thought a bad glow plug would affect the light. The car starts a little rough when cold. I wouldn't doubt there's a bad glow plug or two.
I'm wondering are the 617 and 603 glow plugs the same? I've got a set of extra 617 plugs.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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#6
09-09-2005, 11:56 AM
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Sorry, I don't remember the size. Pencil type plugs.
Did you check the 80 amp fuse??
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www.jerseyplanning.com 1987 300TD 440K - My car 2005 Jeep Grand Cherokee Laredo 107K - Tim's car 2000 - CLK320 100K - Deb's car 1994 C230 150K - Josh's Car
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#7
09-09-2005, 11:56 AM
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Quote:
 Two, it performs simple diagnostics and informs you of a problem by not illuminating. Quote:
Best Regards, Jim
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#8
09-09-2005, 01:44 PM
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I looked on ebay and one seller had the same plugs listed for both cars. I never realised that the GP relay did more than just energize the plugs.
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DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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#9
09-09-2005, 03:38 PM
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Quote:
__________________
DJ 84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012
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