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)
I've a 2002 525i that i inherited from my late father. I don't use it often but lately its been having a rough engine, sometimes even stopping completely. Had it analyzed thinking computer just needs resetting. But mechanic said it shows 'miss fire' on all cylinders. Then he said it may be because of fuel system. I have a hunch it could be electrical because just had the car oil changed, and fuel filter, fuel pump, spark plugs are new.
Missfire on all Cylinders? Do you know the exact codes its throwing? Knowing those will help diagnose it better.
Start with checking all vacuum lines and intake boots for cracks. Any cracks or tears in a Vacuum line can cause issues. Also cracks or tears in the Coil Pack boots can do the same. Check those as well.
Each cylinder has its own fuel injector. Their are ways to remove them and test them to make sure each cylinder is getting fuel.
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