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: Rough idling - 1990 Chevrolet G30

This could be an issue with a blown head gasket. This would require a professional mechanic to check engine compression as well. This can occur without causing oil/coolant mixing. If you are still having trouble, a certified technician from YourMechanic...

Q: Blinking check engine light

Check for corrosion on coil pack terminals (where plug wires enter coil). Common cause of that issue. If you put a Code Scanner on OBDII port (beneath steering column) it might get you in general area reading out ignition or...

Q: No spark replaced opti, coil, ice, pcm, bypassed vats still no spark

Hi there: This might seem to be over simplification, but you might want to double check all ground wire connections to the distributor first. Quite often a simple step like this is often one that's overlooked. If you're still struggling...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...