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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 11-29-2010, 10:34 AM   #1 (permalink)
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2003 e39 525i rough idle

Friends,
This morning my e39 was idling so rough it felt like it was runing on oval wheels. I checked the codes and I get misfires on cylinders 1,3 & 5.

After letting the car sit for 2.5 hours, I started it again and it idled smoothly. But was still displaying fault codes for misfires on cyliners 1,3,5. Since I do not want to destroy my catalytic converter, I'm not willing to drive it until I can check it out. Any thoughts on what it could be?

I'm thinking spark plugs or ignition coils. But all three cylinders on one side are out. what else could this be?

Thank you and I look forward to reading your responses.
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Old 11-29-2010, 10:45 AM   #2 (permalink)
OMFG another one!?
 
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Also worth a look are the mass airflow sensor, and a look at the intake ducting for cracks.
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Old 12-01-2010, 07:45 AM   #3 (permalink)
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Thank you for the tip!
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