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.

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?
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 misfiring, running rough.

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: Car running rough and shaking

Hello. I think the "fuel tank being open" you are referring to is a code for the evaporative emissions (EVAP) system. This system is used to capture fuel vapors and prevent them from entering into the atmosphere. If the powertrain...

Q: Camshaft position sensor and spark plugs

Hi There, This is definitely a timing issue and most likely related to a camshaft position sensor failing and potentially bad spark plugs and/or wires. The camshaft position sensor is a magnetic sensor that monitors camshaft speed to regulate ignition...

Q: White smoke coming from tailpipe with the code for evap large leak.

Hi there. The white smoke coming from the exhaust system indicates that there is water (coolant) in the exhaust system. This is caused by the coolant getting into the combustion chamber and burning off with the fuel. The coolant is...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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...