Skip the auto shop - Our mechanics make house calls

Q: Car misfiring, running rough.

asked by on

My car is running rough. The codes say I have a lean mixture and I am having misfires in the cylinders.

A: The lean codes on this engine could mean yo...

The lean codes on this engine could mean you have a lean condition that the computer sees as a problem. The computer would need to be scanned to see if the mass air flow sensor is reading correctly. The sensor normally gives a reading to the computer of the cars altitude or barometric pressure. If the reading output does not match the local pressure the sensor may need to be replaced. I have seen sensor readings equal to 10000 ft above sea level when I was at 10 ft above sea level. This will cause the computer to send less fuel to the computer and would cause lean codes. In this case, a mass air flow sensor replacement fixed it.

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: Check engine light comes on while driving. My vehicle started jerking while driving. I was told it may be the camshaft sensor.

Hi there. When your car is jerking around, this means that the engine is having a misfire and causing the engine to stumble making the vehicle seem to jerk around. Check the camshaft position sensor for any damage and if...

Q: Transfer case will not lock front drive line in for 4 wheel drive.

Hi there. Sounds like the chain in the transfer case has broken. If your transfer case has gears, then the gears may have broke off or ground down the teeth. Also, the syncronizer slider in the transfer case could have...

Q: Code 2PO141 on Chevy Cavalier

That means it is running lean. An engine running lean can be a lot of things. It can be too much air or it could be not enough fuel. Check for vacuum leaks first. I've got a video "finding engine...

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...
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...