Q: Misfires at high speed on a high way

asked by on

The car moves smoothly at high speed up to 100miles per hour, but when I push the pedal down (kick down) to overtake other vehicles the engine misfires, showing check engine light. When l reduce speed a little, the engine regained full power and the check engine light disappears from the dashboard. Best regard.

My car has 100000 miles.
My car has an automatic transmission.

Hello there, a few common faults will cause your 2004 BMW 540i to have a misfire on acceleration. Without knowing what code the engine is storing I can only offer general advice. Likely causes for the car to misfire like this would be the fuel pump, fuel filter, spark plugs, coil pack, throttle body faults, or a wiring harness issue. Since the problem only occurs when the pedal is pressed at first this tells us a part is on its way to failing, but has not fully yet. A qualified Technician such as one from YourMechanic will be able to diagnose your misfire condition and make any repairs required to resolve the issue.

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. Misfires at high speed on a high way

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: What repairs fix codes P0172 and P0304? I just had all the spark plugs replaced recently.

The P0304 code indicates a misfire has been detected on cylinder 4. The P0172 code indicates that the fuel mixture is richer than the mixture control can compensate for. It's possible that they are related, but not necessarily. Rich mixture...

Q: Can I drive car with oil filter gasket going bad

Hi there, thanks for writing in. Oil leaks will only get worse over time. The oil filter housing gasket on the 325s get hard and brittle over time and begin to leak profusely as the they fail so it will...

Q: Trouble code P0101

Hello. P0101 is the trouble code for a problem with the mass airflow sensor and or circuit. This code is thrown when the computer detects an issue with the signal of the MAF sensor. The MAF sensor is one of...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...