1985 300D Turbo Diesel- rough start - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 07-06-2014, 10:23 AM Thread Starter
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Cool 1985 300D Turbo Diesel- rough start

Hello

Just recently my '85 300D Turbo Diesel has been starting rough or in a delayed manner. It doesn't do this every time, maybe 4 times in the last week. It has started within a couple three minutes each time. I first thought it might be the battery or ignition, but I'm guessing, and I mean guessing, that it has something to do with the fuel or spark moving correctly.

Any thoughts, ideas, experiences on similar starting issues are appreciated!

Thanks in advance
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post #2 of 6 (permalink) Old 07-06-2014, 01:44 PM
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It could be ignition, but there is no spark on a diesel. So the ignition comprises of needing a source of heat when started cold. Hence the glow plugs. Are you getting the glow plug light on the gauge cluster to do anything unusual?

When was the last time the fuel filter was changed?
Have you checked for leaks around the injector pump or the injectors?
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post #3 of 6 (permalink) Old 07-06-2014, 02:52 PM
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Is it morning start issue, or whole day start issue?
Checking glow plugs would not hurt, abut you have power rail, so it would take disconnecting each.
You do have some clear fuel lines at the IP. At least they were clear when new. Observe if you see air bubbles in them. Replacing them might be a good start.

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post #4 of 6 (permalink) Old 07-06-2014, 03:12 PM Thread Starter
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This 300D is my first diesel and Mercedes. The glow plug seems normal. Normal as it has been and starting fine. I do believe you are correct about the injector or injector pumps. I do see a leak. Just got this car a bout a month agao, not exactly sure when the fuel filter was changed.

Thanks again
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post #5 of 6 (permalink) Old 07-06-2014, 03:16 PM Thread Starter
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Kajtek1-

the first time it happened was in the evening. It has happened on two mornings, and a midday. It has started each time within a few minutes. I do see leakage from the top of one of the injectors.

Thanks you
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post #6 of 6 (permalink) Old 07-06-2014, 06:28 PM
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Top of the injector is probably the 5 mm leak line. Those are sold by meter and you should get all replaced.
They do not have effect on starting, so keep looking. Leak on diesel is usually air getting in, not the fuel getting out.
On newly purchased car replacing filter and prefilter should be one of the first things to do.
Try to park the car nose down and then observe for wet spots in the morning.

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