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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. car loses power, hesitates, and miss fires

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: Rough idling, no power on acceleration, revs by itself, shuts off

The first thing I check for in any drivability problem is air leaks. Any air that gets into the engine without going through proper channels will lean out the system and cause these kinds of problems. Look under the hood...

Q: Car takes about 20-30 minutes of driving to reach operating temperature

Replacing the thermostat should solve this problem. The thermostat is supposed to keep the cooling water from circulating through the radiator until the engine reaches operating temperature. The reason your temperature seems to rise when you park the car is...

Q: Check engine light in code P0418

The air pump fuse is a 30 amp fuse that powers the pump. The "trigger" for the relay comes from the ignition switch, through a 10 amp fuse. Have you checked to see if the "trigger" wire to the relay...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...