Q: Car makes noise when starting that goes away when driving. Transmission leak.

asked by on

Car makes a noise upon starting, but the noise stops once I start driving. The transmission fluid is also leaking.

Looks like your Toyota 4Runner is actually experiencing two different issues. Let us first start with the noise the 4Runner makes upon startup, that noise that goes away once you start driving. From my experience with working on Toyotas, and owning a 4Runner myself, I would first check the belts and pulleys for wear. The fix could be something as simple as replacing these worn out belts. However, you could also have bearings in the idler or the tensioner pulley starting to fail. This is a commonly overlooked and simple fix. It is important to have a mechanic inspect the noises to avoid spending money on parts you may not need. Your money is better spent elsewhere not on guessing.

As for the transmission leak, an inspection would also be in order to find the source and severity of the leak. If the leak is on the larger side, transmission damage can occur due to lack of fluid and it is important to find this out as early as possible. With anything transmission based, it is always best to have a certified mechanic trace the leak so it can be properly repaired. This is the quickest way to get your 4Runner back on the road for miles to come.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car makes noise when starting that goes away when driving. Transmission leak.

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: Overheating Under Load

Hello. To start, you may have a restriction in the system somewhere. This will come in the form a clog in the radiator, or the water pump going out. Both of these units can be tested individually. The clogs will...

Q: If I take my foot up off the as it might shoot forward

Hello! Thank you for writing in with this question and concern. A surge like this could be caused by any number of electrical sensors (intake temperature sensor, throttle position sensor, etc.). It could also be caused by a mechanical malfunction...

Q: Car makes sputtering noise

If your car is making grinding noise, and will not turn on then that is a sign that serious engine damage may have occurred. I would recommend having a professional technician, such as one from YourMechanic, listen to the noise...

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...
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...
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.