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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 11-02-2008, 07:40 AM   #1 (permalink)
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525 tds erratic idle/ power increase black smoke

Hi guys, first timer on here, love the look of the site, wonder if any one can help??
I have a 525tds 1995 model with about quarter of a million miles on the clock!
This car has never let me down, oil/filters changed over regularly, however it has developed a problem. ----here are the symptoms;

Erratic idle almost like a missfire when driven, goes like smoke, however there's plenty of that as well, as in clouds of black.
now I've cleaned the EGR when you disconnect the vac pipe, it runs marginally better, reconnect and give hard throttle there is knocking as in overfuelling. I've changed fuel/air filters, pump in tank putting out correct pressure
can anyone help ??
any advice??
Thanks in advance Greg
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Old 11-02-2008, 09:38 AM   #2 (permalink)
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Injectors are coming to the end of there life, I would suspect with 1/4 million miles on the clock.
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Old 11-02-2008, 03:18 PM   #3 (permalink)
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Thanks marti, surely I'll check/test them, but why do things change when the vac pipe to the EGR is disconnected, clearly it is overfuelling, but surely not on all six (i.e six injectors).
thanks again Greg
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Old 11-03-2008, 04:38 PM   #4 (permalink)
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Sounds like classic injector trouble but get codes read as it may be temp sensor failed as well causing it to run rich
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