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Old Nov 19, 2011 | 03:32 PM
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300d
Hard start

1983 300d, hard to start in temp. below 45, in warmer weather no problem. Glow plug light comes on as it should. Does this mean plugs are ok or could they still be the main issue. Thanks, Dave
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Old Nov 19, 2011 | 09:56 PM
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With one glow plug out , starting becomes more difficult, especially in cold weather.

When it does start, does she miss on one cylinder for a few seconds?

Does it start more easily when you leave the glow plugs on for another 10 or more seconds before cranking.

Are you using the correct grade engine oil ?
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Old Nov 19, 2011 | 10:20 PM
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Car does miss on one cylinder for a few seconds. Today I waited 20 seconds after the gp light went out and it did not seem to help. Not sure what grade of oil, because I just purchased the car. what oil and grade would you recommend?
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Old Nov 20, 2011 | 01:22 AM
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Sounds as if it is one glow plug not operating to me .

I use diesel rated 15W40 for my older diesel. Other members may recommend a particular local brand.
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Old Nov 20, 2011 | 01:26 AM
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190D 2.5 (x2), 190E 2.6, W202 C240,W202 C43 (C55), W210 E55, W212 E250CDI
Before you start looking to far into it check all the valve clearences first, if they haven't been checked for a while they way be a bit tight.

The second place to check is the resistance of each of the glow plug, none should be open circuit, all should be less than 1ohm when cold.
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Old Nov 20, 2011 | 05:12 PM
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Thanks for the advice, will get to work on it this week
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Old Nov 21, 2011 | 08:12 AM
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Originally Posted by Carsy
I use diesel rated 15W40 for my older diesel. Other members may recommend a particular local brand.
In the tropics an oil of that sort would be fine but in winter...in most of North Anerica and Europe,at least...it would be foolish to use that.Better 5W..or even 0W...in truly cold weather.
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Old Nov 21, 2011 | 02:24 PM
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http://chicagomercedesrepair.wordpress.com/
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