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I'm not talking about the engine displacement, this is same for all M51 engines: 2497cc -> 2.5l. DDE stands for Digital Diesel Electronics by BOSCH. On M51D25 it is in version 2.1 (1991-1995) and it was updated with M51D25TU to version 2.2 to include MAF (1995-2001). The Range Rover engine is...

Hi, I know this thread is old but exactly describes my problem with BMW 525tds (same M51 engine). Its sad that this didn't get resolved. So I will add my experience for future searches. First of all: This problem is by 90% faulty fuel-pump My engine has total of 400 000 km (~250 000 miles). I...