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.

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

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: Engine misfiring in a 2007 BMW 328i

Your BMW is fuel injected so I'm guessing you cleaned out your throttle body. The next thing I would look into is the coil for the culprit cylinder, have a certified mechanic, like one from YourMechanic, inspect your vehicle and...

Q: Smoke coming from engine

Hello. There are two different types of fluid that would cause smoke to come out from the front of your car. If oil is leaking down from the valve cover gasket or oil filter, and onto the exhaust, this will...

Q: What is the onboard refueling vapor recovery system?

Fuel vapors are pollutants – they create hydrocarbons in the atmosphere and add to the smog choking many US cities. Your Accord has quite a few different emissions control systems, including an onboard refueling vapor recovery system. When you fill...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...