Q: Engine check light, rough idle, loss of power.

asked by on

My name is john. i own a '07 kia optima ex v6 in excellent condition,always dealer serviced in the 4+ years i've had it. But sporadically over the last year or so, the wife or i can be driving along on the hwy or in the city, then all of a sudden the check engine light will come on and the car will start loosing power,shudder and barely make it to the shoulder or curb. Once in park,it is still running rough at idle with no throttle response. If we turn the car off for a couple of minutes then restart it,its like it never happened although the check light will still be on and eventually go out by itself a few minutes down the road. The car has had a new timing belt at 115k, major tuneup, and a new purge valve. A friend suspected maybe a bad MAF Sensor since i at one time had a K&N air filter. I've since cleaned it twice and noticed a slight improvement. Could that be my issue?

My car has 135 miles.
My car has an automatic transmission.

Hello. If your filter is over oiled and the oil got onto the hot wire of the air flow sensor, then that can cause it to burn out. A scan tool could be used to check the reading of the sensor to see if it is failing. Scanning the computer for codes would be a good idea anyway since the Check Engine Light has been coming on. I have also seen the throttle bodies fail on this engine as well as the variable valve timing actuator. These may need to be tested once the other components are ruled out. If you want to have this repaired, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the loss of power and Check Engine Light to have this correctly resolved.

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

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!
  1. Home
  2. Questions
  3. Engine check light, rough idle, loss of power.

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: The front end and steering wheel shakes when I accelerate.

You may have a traction control system that is activating when you are accelerating. This can be due to one of two things: the speed sensors in the front detect that a wheel is going faster than it...

Q: What could cause my ESP light and ETC light to come on while driving?

The ETC is your electronic throttle control which is usually related to a low voltage problem. Start by having the voltage to the unit checked. The ESP light is the electronic stability light which can also have problems when there...

Q: Humming noise, wheel bearing issue, and two evap leaks

Regarding the right, front wheel bearing, you can confirm this diagnosis by turning left at moderate speeds (i.e. freeway on-ramp). The noise will increase during the turn (which loads the right front wheel bearings). Regarding the squeal while turning...

Related articles

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.