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Old 08-17-2005, 07:57 AM
Guy Joseph
Join Date: Aug 2005
Location: France
Posts: 7
W123 300D running problem

My diesel merecedes has recently developed a cutting out problem. It had complete filter changes 2 years ago and I have only covered 8,000 miles since.

The symptons are as follows:

Whilst driving, the car starts to lose power and then judders to a halt. Even after a short journey. It is difficult to re-start, coughing and spluttering and then cutting out. When it starts again it seems fine and then the symptons start all over again.

I am very reluctant to give the car to a French mechanic and would really like to tackle the problem myself. Any advice greatly appreciated.

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Old 08-17-2005, 11:51 AM
Registered User
Join Date: Jun 2005
Posts: 37
Diesel Troubles

Sounds like you have fuel problems. If you only drive 8000 miles in two years, you may have algae growth in your fuel tank, lines, and filters. I would definitely change both the primary and secondary fuel filters (and in the process bleed all the air out of the fuel system with the hand pump). You may also want to put some algae treatment in your tank. It's kinda like chicken soup, even it that's not the problem, it wont hurt anything. do a search on diesel fuel problems and you will find lot's of info. Lastly, you may want to check the Diesel section of this site. There is bound to be better expertise there.
98 S420 My Wife's Baby
97 S320 My road car
83 300D My old road car (love that diesel)
81 300SD Wife's former Baby
81 240D A fun stick shifter
71 220D My first one
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Old 08-17-2005, 01:55 PM
engatwork's Avatar
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,241
Clean the fuel tank screen.
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Old 08-17-2005, 11:20 PM
Johnhef's Avatar
Senior Member
Join Date: Feb 2005
Location: Frederick, Md
Posts: 4,540
if its not a fuel related problem, check the valve cover ventilation. boneheaddoctor had a similar problem with this and it was discussed for quite sometime, try searching the archives for it.


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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