Q: Engine light and rpm increased while driving

asked by on

When driving the engine light comes on. The rpm jumps 200 to 300 more and drops right after the car jerks and it feels like the engine is acelerating. This happens on and off. When stop at a light on drive car acelerates by itself. Black smoke and fuel smells. Already change trotle body sensor and fuel sensor. Have been check by 2 mechanics can find problem. Car shots off while driving one time

My car has 200000 miles.
My car has an automatic transmission.

This is a common sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this is dirty or faulty, this causes an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions. This type of inconsistent fuel supply to the motor may cause a hesitation, loss of power, a jerking reaction, potentially a bot of black exhaust smoke and typically a strong smell of fuel when this sensor is malfunctioning. When this is not working properly, you may also notice a strong smell of fuel. I would suggest having a professional from Your Mechanic come to your home to diagnose your mass air flow sensor.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. Engine light and rpm increased while driving

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: Not sure what the problem is , losing coolant but no leaks .

If you are losing coolant then you do have a leak somewhere. If when pressure testing there is a loss of pressure but no external leaks then you have an internal leak. You will need to remove the spark plugs...

Q: I have a 2008 impala 3.5 when I get to a light and stop signs and come to a complete stop then begin to accelerate the car gets to

The problem sounds like it is in the transmission or the torque convertor. When you start to accelerate from a stop the torque convertor needs to produce enough pressure to get the vehicle to move and the transmission front pump...

Q: My car starts fine and I can drive it perfectly fine for about 15 minutes then it bogs down and will not move.

Hi there, thanks for your question. The fact that the car starts up and runs fine for 15 minutes before it stalls suggests that it is likely related to an air/fuel issue. There is something known as a mass air...

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...
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...