1984 300TD Wagon. All of a sudden, we have no glow plugs. The dash light isn't illuminated and the plugs aren't getting hot. We thought we had tracked the problem to the preglow time relay, and changed it out, which includes the 80A fuse, but the problem still exists. Any thoughts?

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"If we can't have fun while we're here, we might as well go to the house".

1978 300CD
1985 300TD
1999 Land Rover Discovery II
rover1@sbcglobal.net

When two or more GP's go out, the system will not cycle. Soumds like you checked all the typical areas, except the GP's themsselves. Also, note that just because a GP shows a good ohm reading, does not mean it's a good plug.

Diesel Giant has a great write up on testing the GP's.

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 210K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Best to change all five,and keep any good ones for spares.Ream those holes too.Take a bad glowplug,beat it a little flat with a hammer.Sharpen with grinder or file(so it is larger than a glowplug by .015" each side). Screw this reaming into holes,remove and turn engine over to blow out carbon. Many happy miles on your new plugs.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Very common problem. I bet you it is the main power relay located under the dash on the driver's side. That relay failure is consistent with your symptoms.

Now that you've installed a new relay, do you have 12volts at all 5 glow plugs when you're glowing? Touch one lead of the meter to the end of the plug where the wire attaches, and the other lead to ground to check.

If you have +12v to each plug, then you have a couple bad plugs.

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now