Skip the auto shop - Our mechanics make house calls

Q: Car rough idles and worse when engine is warm - 2008 BMW 528i

asked by on

My car has a very rough idle. It has approximately 87,000 miles on it. A decarb has already been performed. When the engine is warm and the car is not in motion (just sitting) is when the rough idling problem is the most noticeable. There is a dip in the idle, but my car does not die. Could you please tell me what is causing this so that I can fix it. Thanks.

A: Hey there. You should first check for any p...

Hey there. You should first check for any problem codes. Next, check for vacuum leaks. Third, check out the idle air control valve - clean it if possible. A professional mechanic, like one from YourMechanic, can help with this diagnosis and repair of your idling issue.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car has increased RPMs in neutral. Nissan Sunny 2008 (Japan Made)

The computer over time learns to control the idle and after you cleaned the throttle body it will cause the idle to go up from the increased air getting into the engine. If you disconnect the battery for about two...

Q: 2c9d code and misfires on the cylinders 4, 5, and 6.

Hi there. The oil could have gotten on the spark plugs causing the plugs to not fire. Take out the spark plugs and see if they are covered in oil. If they are clean them off with carburetor cleaner and...

Q: Engine Stutter On Acceleration

It's likely that If you were to scan the engine controller, (ECU) you would probably find several misfire codes. The misfire codes can indicate specifically which cylinder if malfunctioning. Your model car has a history of coil and ignition module...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...