E39 Tds Glow Plugs Not Warming Up - BMW Forum - BimmerWerkz.com
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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#1 (permalink) Old 06-25-2005, 01:17 PM
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I have a E39 525 TDS and its not starting up normally. I can get it to start up after about 90 seconds of cranking the engine. In the mean time it is blowing out grey smoke whilst attempting to start-up. This is probably unburn or partially burnt fuel.

Once the engine is hot, restarting it is no problem. This indicates that the failure is primarily in heating the cylinders to get the engine going.

I tried to diagnose the problem, it appears that there is no current/voltage to the glow plugs. Looking at various web sites, it would appear that the problem may be with the glow plug relay.

Can anyone advise where I may locate this relay on an E39 1998? Pictures would be most helpful. It is most probably in the sealed compartment under the passenger pollen filter (I am in the Uk so thats the left hand side of the car from the drivers view point).

I look forward to hearing from anyone who has experience or knowledge of this type of problem.

Thanks
Hanif
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#2 (permalink) Old 06-26-2005, 10:55 AM
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OK the relay is where you say under the left hand micro fitter thereís an E-box itís in there. You canít really miss which one it is it has a big fuse link bolted to it the wiring for the glow plugs is heavier than most it is a big black relay. Iíve never seen one go faulty, normally itís the glow plugs them self or the fuse link. The best way to test glow plugs is with a big amp meter you remove the relay and feed each plug through the meter each plug will take 20amps at the start then this will slowly drop as the plug heats and its resistance drops. You can also test its resistance remove the relay and test from the wire to earth I think they should be about 1km but if theyíre faulty theyíll be open circuit

Cylinder pin
1 9
2 8
3 7
4 3
5 2
6 1
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#3 (permalink) Old 06-27-2005, 02:39 PM
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Thanks "Bad Man Working". I will follow the instructions you have provided. Hopefully should be able to find the faulty item.
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