5

Car details:

BMW 530xd
E60
2008-05
Diesel
170kw.

The pump is working as it should be, it has been tested in BMW center. Problem is, when I turn the ignition on, the check engine light doesn't come up for about 4 minutes 30 seconds and in that time I am unable to start the car. (it's only happening in cold whether, when it's about +2 to -5...n), when the engine is warm, this light comes up instantly when I turn the ignition on. I can hear a sound of something working while I am waiting for this light to come up, once it comes up, I can hear the sound more clearly. Once I've start the engine, this light goes off as expected. But the problem is this 4 mins delay after turning the ignition. I've read a lot about this problem and it all leads to the fuel pump relay.

Dzianis Yafimau
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Paulius Matulionis
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2 Answers2

1

you might need to check the relays in the fuse box, without forgetting the fuel regulator.

Omar Khoali
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0

I think that something blocking fuel lines, maybe hose bend. After some time under pressure of fuel pump it unblocks and fuel rail pressure returns to normal. Not sure that ECU has fuel pressure sensor, so it is just a theory but it worth to check fuel pressure first

Dzianis Yafimau
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