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Old 06-23-2008, 11:31 PM
Hatterasguy's Avatar
Join Date: Nov 2002
Location: Milford, CT
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True, try to start a 603/6 on a hot summer day without GP's, good luck. But this is a 617 were talking about, they are not exactly picky.

If the engine is in half way decent shape, and its above 70 it should light right off.
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Old 06-24-2008, 01:18 AM
imagesinthewind's Avatar
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Join Date: Mar 2006
Location: Denver-ish
Posts: 953
I'll try the glowing for 30 seconds and see if that helps.
Plugs are only 8 months old.

No WVO in the car in months and both filters changed after this started happening to see if that was the problem. Didn't change it at all.

The hard starts happened suddenly. One night I put her away for the night, the next day she was hard starting.

She's never been picky before but tonight I plugged in the block heater. Wonder what will happe in the AM.

Starter sounds peachy. Turns fast until the battery starts to lost it.

There was a small problem with the ignition for a while. The glow light wouldn't always come on. I'd have to turn the key several times until the light came on to start it. To my knowledge the car never was attempted to start unless the glow light was on. That prblem fixed itself and the light comes on every time.

If the plugs are less than a year old, could it be the relay?
Ginny in Denver-ish
78 300SD, 265K (mine)
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Old 06-24-2008, 10:49 AM
Down South GA Boy
Join Date: Apr 2008
Location: Atlanta GA
Posts: 116
goto (i have no affiliation) there on the Mercedes diesel page they have a good troubleshooting guide for both the relay and glow plugs. go and give it a look and a try if you have a voltmeter, worst case you need a new relay and a new set of glow plugs.
'81 300D - swapped to a 617.951 turbo motor with a 150 amp alt.
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Old 06-24-2008, 11:01 AM
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Sounds like low compression to me, and only will light off when the rings are lubricated. You may also want to try removing the shut off valve line while attempting to start.
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Old 06-24-2008, 12:27 PM
imagesinthewind's Avatar
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It's not low compression.

Car was plugged in all night and started right up.

Car doesn't and has never smoked or used oil. A small oil leak but small enough that I never need to add oil between changes. at 5000mi.
Ginny in Denver-ish
78 300SD, 265K (mine)
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Old 06-24-2008, 12:41 PM
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Posts: 18,355
It's glowplugs. You need to borrow or buy a multimeter to check the voltage the resistance on the plugs, although Barry's non-multimeter methods will provide some data. I think all the SD's had parallel plugs and not series plugs since they are turbo engines. If so, you can ignore what Barry had to say about the squiggly wires.
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Old 06-24-2008, 02:09 PM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,353

From your description:
* Bad glow plugs are very possible, What brand was used?
* Bad glow plug relay is possible.

wont start for anything! 1985 300SD

Diagnostics post 65 - 171.

Post 155, 156, 157 for pictures.

Glow plugs link thread

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