Skip the auto shop - Our mechanics make house calls

Q: Engine light comes on and idles roughly.

asked by on

The Engine light is on and the car idles roughly. It was diagnosed earlier as an engine misfire.

Single cylinder misfires are usually caused by ignition components which is where I would start with on this car. Verify the ignition cap and rotor are still in one piece and that the wires are not arcing losing spark. Have a mechanic scan for codes to find out which cylinder is misfiring (P0301 for cylinder 1, P0305 for cylinder 5, etc.).

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

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: Would low engine oil cause the check engine light to come on in my 2002 Toyota Corolla

Hello. Typically low engine oil will not cause the check engine light to come on in your vehicle. Unless the oil level is low enough to cause a drop in engine oil pressure, the oil light will not even come...

Q: How do I fix O2 sensor heater cylinders 1-6 circuit malfunction?

The oxygen sensor heater is integral to the sensor assembly itself. It is not separately serviceable. If the heater tests bad, the entire sensor is replaced as an assembly. In your case, P1193 refers to an oxygen sensor which is...

Q: Temperature gauge -- engine running cooler than normal. Below 90 only while driving.

Hi, thanks for writing in. If the engine is running cooler than normal, this could mean the thermostat is stuck in the open position. This will cause the engine to run cold and not warm up properly. This can cause...

Related articles

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...
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...