Skip the auto shop - Our mechanics make house calls

Q: My car is skipping - do I need new spark plug wires?

asked by on

my mechanic changed spark plugs, but my car is still missing if u no what I mean, he suggested new spark plug wires, since I've had the car some 75000 miles,

My car has 179000 miles.
My car has an automatic transmission.

A: Old or faulty spark plug wires can definite...

Old or faulty spark plug wires can definitely be a cause for the engine to misfire, however there are numerous other reasons that may also cause this to happen. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition modules not working properly. When the misfire results from a fuel related issue, this is commonly related to a lean fuel condition (lack of sufficient fuel supply to the motor). Fuel related misfires can be caused by many different things such as low fuel pressure, faulty or dirty fuel injectors, a faulty O2 sensor, a dirty or failing mass air flow sensor, a faulty or dirty idle air control valve or a vacuum or intake leak. When the fuel supplied to the combustion chamber is insufficient, this results in an ignition (spark) that is igniting a less than balanced load of fuel and air. I would recommend having an expert from YourMechanic come to your location to diagnose your misfiring problem.

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

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!

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: Steering wheel locked up on my car.

It sounds like you may have a problem with your key. If the key is excessively worn it will not be able to unlock the ignition cylinder so you can turn the key. I would ask for help from one...

Q: Shaking when in overdrive

Hi there. Check the fuel system and see if the fuel injector for cylinder number 2 is malfunctioning. The code P0402 means that the EGR is not functioning and the code P0174 means that Bank 2 is lean, which is...

Q: My Taurus will crank but will not start as it is not getting fuel. I installed a new fuel pump relay switch but it did not work.

Hello there, thanks for writing in. I'd be happy to offer my insight. Many different faults can cause your 2013 Ford Taurus to crank but not start. The most common would be the battery. Before any other diagnosis is done,...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.