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Old 05-25-2007, 10:47 AM   #1 (permalink)
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Question BMW E39 525TDS 1999 - Starting problems

I got a 1999 525tds and have recently been experiencing some problems. when the engine is cold there is no problem whatsoever to start. the problem occurs when the engine is hot. it takes hell loads of time to pick up. the engine turns alrite but it does not catch on. i had it diagnosed at the service agents and they believe its the diesel pump found in the engine compartment. the second problem with the car is that fuel consumption has drastically increased from 7.0 lts/100km to 9.5 lts/100km and therz quite some smoke when i revv it over 3000 rpm on 1st or 2nd gear. i am not sure whether these problems are linked but i have read several posts on different forums and it seems that chaging the fuel pump alone might not solve my problem. are there any other reasons why my car is behaving this way or is anyone also experiencing similar problems? i would really appreciate any help as it saddens me not to be able to enjoy my car as much these days and on top of all u dont expect a bmw to let u down. thnx
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Old 09-12-2008, 07:16 AM   #2 (permalink)
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Originally Posted by was4 View Post
I got a 1999 525tds and have recently been experiencing some problems. when the engine is cold there is no problem whatsoever to start. the problem occurs when the engine is hot. it takes hell loads of time to pick up. the engine turns alrite but it does not catch on. i had it diagnosed at the service agents and they believe its the diesel pump found in the engine compartment. the second problem with the car is that fuel consumption has drastically increased from 7.0 lts/100km to 9.5 lts/100km and therz quite some smoke when i revv it over 3000 rpm on 1st or 2nd gear. i am not sure whether these problems are linked but i have read several posts on different forums and it seems that chaging the fuel pump alone might not solve my problem. are there any other reasons why my car is behaving this way or is anyone also experiencing similar problems? i would really appreciate any help as it saddens me not to be able to enjoy my car as much these days and on top of all u dont expect a bmw to let u down. thnx
Hi There,

I have a 1995 model in Spain with exactly the same problems as you describe. An english mechanic in Spain has told me that he suspects the diesel pump too. This all sounds very expensive for an old car, maybe its something we just have to live with.
Another system my car has is that it stalls regularly when you put it into 'drive' or change from 'drive' to 'reverse' or vise versa etc.

Can anyone help to sort these problems for us please?

Thanks in advance.
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Old 09-15-2008, 11:59 PM   #3 (permalink)
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problem solved

had to change the fuel injector pump, MAF sensor. the car runs as new, no more start problems even when hot. does cost a lot though.
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Old 09-16-2008, 12:16 AM   #4 (permalink)
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^ very glad to hear that it is fixed!
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Old 11-05-2011, 02:52 AM   #5 (permalink)
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I have a bmw e39 525tds 1998 which is not starting.I found my ecu soaked in water i have replaced the ecu and also reprogrammed it to my ews unit.but still it wouldnt start.checked the diesel pump the diesel is not coming through the diesel pump to the injectors.Have checked the relays all good.What would be the problem?And also ASC light stays on.Please help!!!
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