Skip the auto shop - Our mechanics make house calls

Q: Loud chatter at idle only

asked by on

About 2 weeks ago a loud chatter started I checked my oil level and it was a quarter low, no biggie. I added the oil. Drove it home. Car has been parked since. Car has a slow drag when starting and has a loud chatter on idle only. Acceleration makes it stop. But it returns while I'm sitting at traffic lights. Could this be a timing chain issue?

We had the flexplate replaced one year ago also. It's not the same noise. That one was constant. Sounded like a loose bearing by the starter.

My car has 100000 miles.
My car has an automatic transmission.

A: Hello, thanks for writing in. If the flexpl...

Hello, thanks for writing in. If the flexplate was changed within the last year, then I would usually start by isolating that area of the noise. This noise can occur if the bolts are coming loose. If they are fine then the next most common issue is the timing chain. I have seen a lot of these chains either stretch out or the guide fails. Before getting into that though I would change the oil as a dirty or poor quality oil filter will also cause this. If you want to have this chattering sound checked out, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: minor maintenance on vehicle

Billing question sent to CS for the cost of minor maintenance per year, tune-ups, and oil changes cost on a 2016 Hyundai Sonata with a L4-2.4L engine.

Q: My car cranks but won't start. Had codes read and it's say left front wheel speed sensor. Can you help?

Hi There, It sounds like you may have a faulty traction control module. The wheel speeds senors are located at each of the four wheels and process wheel speed ad relay this information to the traction control module which uses...

Q: My battery's dead and somebody is giving me a jump and it's not working

When jump starting your battery, you need to ensure that you have good metal to metal contact on both ends of the jumper cables. It could also be that your battery is toast. I recommend removing your battery and having...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.