Skip the auto shop - Our mechanics make house calls

Q: I'm having a problem with arcing from the plug wires.

asked by on

I'm having a problem with arcing from the spark plug wires and making the car run rough and stalling. I have replaced the plug wires, plugs, and ignition coils and it is still doing it. At night you can still see arcing coming all the way up the wires. I'm not sure if it is a bad motor ground somewhere. All the sensors have been replaced and fuel pump.

My car has 218000 miles.
My car has an automatic transmission.

A: The problem you are having is not due to th...

The problem you are having is not due to the ignition system but is a result from an improper amount of fuel getting into the cylinders. If your engine is running lean, then it may cause the engine to not be able to spark across the spark plugs. A lean condition can be from poor fuel quality, excessive cleaners in the fuel, low pressure, dirty injectors, carbon build up on the valves, or engine vacuum leaks. You should have the computer data checked to see if the engine fuel controls are running the engine lean due to a vacuum leak or lack of fuel. Have the systems diagnosed by a mechanic to narrow the cause of the problem you are having. If you need help looking into this, YourMechanic offers a repair and diagnosis service preformed by a certified mechanic that will commute to your location to inspect why it's running rough.

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・Save up to 30%

Get a quote

What others are asking

Q: Engine won't fire without ether and runs bad until it warms up.

Hi there. There could be a lot of carbon build up inside the combustion chamber making the fuel not burn properly due to the valves and rings not sealing. First check the spark plugs and see if there is excessive...

Q: 2005 Pontiac G6 not going into gear

There are a couple of possibilities for this concern. The most common issue is a faulty transmission range switch. If the coded output from the range switch is received incorrectly by the PCM you will get incorrect operation of the...

Q: No one seems to know what to do or want to make the effort to find a solution.

Well, you're likely very far from a circumstance where you need to give up and get another car. Old cars do require more maintenance and repairs than new cars so some of the issues you are describing are just part...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.