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2004 BMW 525i rough idle issue when starting the car

Cleaned the MAFS twice with no results. Runs rough for approx 3-4 minutes then the car is fine. Any ideas on troublshooting?

Posted by Anonymous on

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5 Related Answers

Anonymous

  • 38 Answers

SOURCE: 1998 BMW Z3 2.8 Idles rough when cold starting in wet weather

the problem could be in air mass flow sensor, but it's expensive

Posted on Jul 07, 2009

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Anonymous

  • 580 Answers

SOURCE: Hi I have 2000 BMW 320i. Lumpy idle when cold and oil light for

Your oil is a little low, and the timing may be off a bit but if it smooths out after warm it is probably ljust
low oil.

Posted on Jul 08, 2009

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mike fuson

  • 636 Answers

SOURCE: 2001 BMW 325i problem: Car runs very rough, but no warning lights

Sounds like a fuel problem , have you changed the fuel filter in a while ? could be the knock sensor or the knock sensor module needs to be replaced.

Posted on Jul 28, 2009

Daniel Bakewell

  • 691 Answers

SOURCE: My 2004 BMW 525i won't start (no clicking, slight humm)

starter motor solenoid problem by the sounds of it, check the connections are clean and secure, give it a tap with a soft head mallet or hammer handle. If it doesn't spring back into life it will need replacing.

Posted on Jan 06, 2010

Molson02536

Harvey N Tawatao

  • 3854 Answers

SOURCE: oil change reset for bmw 525i

You only need to hold the left odometer reset button while turning the key to position 1 (Accessory). Keep holding the button for 5 or so seconds until any of the following shows in the display: OIL SERVICE or INSPECTION with RESET or RE. Release the button and press it again for another 5 or so seconds until RESET or RE flash. While the display flashes, press the button one more time briefly. If done correctly, END SIA should show up for a few seconds. All done.
Thank you for using fixya

Posted on Jun 07, 2010

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1 Answer

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Hi this is showing as you MAFS or Mass Airflow Sensor. please see pictures and location of MAFS hope this helps 23992637-vsrhmgky1iochn110wmavtyi-2-0.jpg 23992637-vsrhmgky1iochn110wmavtyi-2-2.jpg

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Rough idle, car has no ICV, idle control valve, so what now?


It will deffinitely have a form of idle control, sometimes it is part of the throttle body but there will be one... 100% certain.

Rough idle as in lumpy will not be an ICV related fault, as with ICV it will either have solid high revs or none at all.

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Sounds like a fuel problem , have you changed the fuel filter in a while ? could be the knock sensor or the knock sensor module needs to be replaced.

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On the 325 series I have worked on (your year, make, model), I have found that idling issues like you describe are the result of a defective oxygen sensor. Replace the oxygen sensor with a Bosch unit. That should take care of your issue.

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