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Old 04-09-2002, 09:32 AM
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Angry Engine cuts out after 10 minutes

First, a big thank you to this forum which has helped me greatly in the past. Now please do it again!

Have W124 ī91 300CE. Car always starts easily, even after several daysīnon-use. However, after running fine for about 10 mins, the engine just dies - and thatīs it! I can get nothing out of it at all for at least 40 minutes. Then, usually, I can get the engine started, but unless I keep the revs at around 2000, it just dies again. Similarly if I try to put it into gear (auto shift) the engine just dies.

After about one hour, I get the engine going again and, although it runs a bit rough for a few minutes, I can usually get into gear and away. Thereafter, for the rest of the day, even if I park up for several hours everything is absolutely fine. Car starts perfectly and runs without any roughness.

Clearly this is something to do with a component that reacts to the engine warming up - perhaps changing the mixture, ignition timing or whatever. But what is it??

Please help on this as I am now living in Spain and itīs really hard to explain this to the Spanish Mercedes dealers - even if I trusted the local one which I donīt after he blew up my radiator!

All suggestions gratefully received.

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Old 04-09-2002, 10:06 AM
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Join Date: Jun 1999
Location: Surrey, Beautiful British Columbia, Canada
Posts: 750
when did you last replace your fuel filter? that is a good
and cheapest way to start hunting!
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Old 04-09-2002, 10:08 AM
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Join Date: Apr 2002
Location: nevada
Posts: 21
I had a similar problem w/ my 300e before. what was causing it was a bad fuel filter. You might want to check into that or you might also have a bad overvoltage protection relay. These parts are relatively cheap.
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Old 04-11-2002, 07:01 AM
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Engine cuts out...

Thanks to Joel and DesertRat.

As you say, this is a cheap(ish!) item, so itīs certainly worth checking, but I suspect it may be more complicated because of the repeatability of this problem. It ALWAYS happens about 10 minutes after starting - just about the time that something or other would be adjusting the mixture/timing or whatever, I suspect.

Another factor I have discovered is that, if I drive the car every day, it doesnīt seem to happen - only if itīs been left for a coulpe of days or more. Even more puzzling!

Still, I didnīt believe that resoldering the joints on my cruise control would fix it, but it did!


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