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?
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 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: Cannot pump gas except a small amount it will cut off like it is full. Gauge will show half full or full. Later it will show empty

There are a lot of things that can cause what you've described: a faulty fuel sending unit in the tank and the tank is actually full, a stick ORVR valve not allowing pressure in the tank to leave when fueling,...

Q: Engine whines, knocks, and has slow acceleration

Hey there. I would suggest you have a mechanic come and listen to the noise and verify the noise you hear. The engine may be making normal noises. You may be hearing the idle control and air pump noises that...

Q: Q: Check engine light

Without additional detail as to the symptoms of the car and how it is running, this may be difficult to diagnose. The coolant temperature sensor is generally something that when not working properly, will cause the car to run hot....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.