Skip the auto shop - Our mechanics make house calls

Q: My car makes a really annoying noise and sometimes dies right after

asked by on

When I start my car up it makes almost a moaning noise then it will keep making it randomly, normally it's when my foot lets off the gas and when I put my brakes on. If I put it in park or sit too long at a light it will make that noise then a higher pitched noise then die. While making that noise my RPMs way up and then back down until my car completely Dies

My car has 175000 miles.
My car has an automatic transmission.

A: Hi there. From the description you have pro...

Hi there. From the description you have provided your vehicle’s moaning noise and intermittent stalling problem could be any number of things. It could be a failed alternator diode making the moaning noise and affecting the idle.

A failed alternator diode(s) allows voltage to flow both directions or no flow at all resulting in noise heard and erratic electrical operation. It could be a faulty idle air control valve. The idle air control valve can make noise and would account for the erratic idle and sporadic dying. It could be an accessory component, such as an A/C compressor, serpentine belt tensioner, or idler pulley, power steering pump making noise and placing undo load on the engine at idle. If you would like to have this done, a certified professional from YourMechanic can come to your car’s location to diagnose the noise and stalling issue.

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: Fuel pump issues

Hello. There are a couple possibilities including the fuel issue you have mentioned. If you spray additional starting fluid in the intake and it runs longer, then that's a clue that fuel starvation is the problem. See if you can...

Q: Right wheel squeaking.

Hi. A loud squeaking typically indicates a brake pad sensor that is contacting the rotor. When this occurs, it is to let you know that the brake pads are low. In some cases, a failing bearing can cause this, but...

Q: timing belt and tensioner replacement

Hello. All noises have to be diagnosed and confirmed so that you don't needlessly spend money on repairs. In your circumstance, your particular car model does require a new timing belt every 60,000 miles anyway, so if the timing belt...

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...
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...
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...