Skip the auto shop - Our mechanics make house calls

Q: My car idles sometimes and there's a problem with the spark plug and coil all the time

asked by on

Me using the car fron 4 months now from 2 week came problem with idle of car in lower gear and i went mechanic then change one coil after 3 day came with same problem went there then change another spark plug coil and that time also plug changed tbey are very dirty.after 1 week feeling the same problem.i dont know what to do..

My car has 500000 miles.
My car has an automatic transmission.

Hello.

Idle issues can be caused by a few different things. A few common causes are faulty coils, or an issue with the idle air control valve. The ignition coils are the components that generate the engine’s spark. It may be possible that they are failing and causing the misfires. If you have already had to replace two of them due to failure, it is likely that the other two will also need to be replaced. An electrical resistance test can determine if they need to be replaced. I would also look into the idle air control valve. The idle air control valve is the component that is responsible for maintaining and adjusting the engine’s idle speed. If it fails or has an issue it can cause an irregularly high or low idle, and in some cases even stalling. If you are unsure I would recommend having a professional technician, such as one from YourMechanic, come to your location to determine what may be causing the idle speed issues.

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!
  • Home
  • Questions
  • My car idles sometimes and there's a problem with the spark plug and coil all the time

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: I know a blow off valve wouldnt do anything to your vehicle if you have a non turbo car

The noise you are referring to hearing when letting off the gas is not the noise of a blow off valve. The noise you are referring to is the result of the release of intense manifold pressure created as a...

Q: Idles high without accelerating

Hello. Thanks for writing in about your 2002 GMC Safari. There are several components that may be causing this problem. There could be a bad throttle position sensor, a throttle cable that is sticking, or a vacuum leak. All of...

Q: Oil pan gasket leak

From the provided description, it sounds like your Nissan Rogue is experiencing a few different concerns. Let us address the concern with the oil leak first. If you are 100% sure that the oil pan is leaking, it is best...

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...
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...
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.