Skip the auto shop - Our mechanics make house calls

Q: car loses power, hesitates, and miss fires

asked by on

when i start my car it starts missing or shaking if i sit in park, and if i take off it will loose power and miss fire. but if i cut it off and on a few times it will stop.
My car has an automatic transmission.

A: From the symptoms described, it does seem t...

From the symptoms described, it does seem that your BMW is unfortunately experiencing engine misfires. However the source of these misfires can really be caused by multiple sources, from worn out spark plugs, to even a failing mass air flow sensor. Since you are able to, in a sense, trick the car into operating correctly, from my experience I would say that the problem is electrical. It is very possible that one or more of the ignition coils have gone bad or that there could be a failing camshaft or crankshaft position sensor.

Coils, plugs, vacuum leaks and many other culprits can be behind the cause of your BMW’s misfires. Since this is a situation involving a long list of possibilities, I would highly recommend getting in touch with a certified technician, such as one from YourMechanic, who can stop by and go over your BMW with you from bumper to bumper and diagnose your running problem. Some handy information you can have ready for your mechanic include the mileage of your vehicle, information on any previous work performed recently and if the check engine light is on and whether it blinks while these symptoms are occurring.

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

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: Steering does not respond properly, do i need to replace the gear box?

As you know, the sway bar connects suspension components on opposite sides of the vehicle. The stabilizer bar should be checked for stiffness. This causes side-to-side motion in the car which affects steering and handling of the vehicle. Failure to...

Q: Noisy power steering wheel, regular fluid used

Hello there. It really depends on what type of regular power steering fluid was put into the vehicle. BMW calls for the standard use of Dexron III fluid which is commonly seen. Most over-the-counter regular power steering fluid are basically...

Q: O2 sensors

Bank 1 is the cylinder bank that has number 1 cylinder. In your case that would be the front bank. Each bank has two oxygen sensors, the upstream sensors are sensor 1 and the downstream sensors are sensor 2. So...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.