Skip the auto shop - Our mechanics make house calls

Q: Engine seemed to be running too rich or too lean, not sure which.

asked by on

Car is running very rough when you step on the gas. It seems like the engine is either starved for gas or air. The Check Engine light is also on.

A: Many different problems can cause an engine...

Many different problems can cause an engine to run rough and lack power. The first step is to retrieve the diagnostic code associated with the check engine light. This will provide a general idea of where to begin the diagnostic process. BMW vehicles often have problems with their VANOS variable valve timing systems. A skilled technician, such as one from YourMechanic, will be able to tell you if this or something else is cause of your symptoms.

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: Water pump not working and its a new water pump.

There is not a fuse for the water pump, however this may be caused by a faulty coolant fan switch or potentially a faulty coolant temperature sensor which is responsible for relaying the coolant temperature to the computer which then...

Q: engine rpm drops or stalls at stop light on abrupt braking.

Hi there. In many cases, the issue you're talking about is caused by an ignition timing problem; typically related to a damaged crankshaft position sensor or trouble within your ignition system such as the coil or distributor. This can be...

Q: Won't start after being read with a Genesis Touch reader

I know these two things happened simultaneously but they may not be connected. Check your fuses for your fuel pump. It's turning over which is good, it just sounds like you aren't getting fuel. You could have a bad...

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...