1979 Mercedes Engine Dies - What could be the problem?

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sfk - 07 Feb 2007 05:26 GMT

1979 Mercedes 300 SD. The engine would idle rough (but good) and
would run fine. During about a 1 hour period, the car hesitated a few
times (semi dying) but then would go right back to running fine. It
then really started to "bog" down untill it finally stalled.

I tried starting a couple of times, semi turns over but then dies as
quickly as it starts.

Any ideas?

I just tried replacing the fuel injectors with no luck.

I do notice when I try starting it I get that diesel fume even though
I know my glow plugs are working.

Any ideas?

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trader4@optonline.net - 07 Feb 2007 12:39 GMT

> 1979 Mercedes 300 SD. The engine would idle rough (but good) and
> would run fine. During about a 1 hour period, the car hesitated a few
[quoted text clipped - 17 lines]
> Articles individually verified to usenet standards. Visit URL to contact author/report abuse
> Thread archive:http://www.AutoBoardz.com/1979-Engine-Dies-problem-Mercedes-Benz-ftop...

Have you checked both fuel filters? Also, this can occur if sludge
accumulates in the fuel tank, more common if the car sits unused for
long periods. Another possibility is fuel pump.

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Richard Sexton - 07 Feb 2007 14:22 GMT

>1979 Mercedes 300 SD. The engine would idle rough (but good) and
>would run fine. During about a 1 hour period, the car hesitated a few
[quoted text clipped - 10 lines]
>I do notice when I try starting it I get that diesel fume even though
>I know my glow plugs are working.

Run two cans of deisel purge through it. Sounds like crud inside the
injection pump.

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Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net

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Ernesto - 11 Feb 2007 23:10 GMT

> 1979 Mercedes 300 SD. The engine would idle rough (but good) and
> would run fine. During about a 1 hour period, the car hesitated a few
[quoted text clipped - 12 lines]
>
> Any ideas?

First thing I'd check are the fuel filters. Had exactly the same problem and
found the primary fuel filter was totally plugged, although it had very few
miles on it. Turned out I'd poured some diesel in from a jerry can which had
some junk in it.

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