Skip the auto shop - Our mechanics make house calls

Q: Exhaust smoke when in idle

asked by on

I was sitting at drive threw and noticed white smoke coming from only one of the exhaust pipes. Problem stopped and has not returned. What could this possibly be?

My car has 117000 miles.
My car has an automatic transmission.

Hello. This may be nothing at all. Most of the time this is caused by a little condensation in the exhaust system which ends up burning off in the form of smoke. It can also be caused by a internal engine issue caused by a leaking valve stem seal, but that does not sound like the case. If the problem has not come back then it should not be anything to worry about. I would just keep and eye on the fluid levels to make sure that it is not burning any of the fluids. If the problem persists, consider YourMechanic, as one of our mobile technicians can come to your home and diagnose the smoke firsthand for an accurate repair.

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

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: What Causes Cracks and Leaks on the Exhaust Manifold?

The exhaust manifold is designed to route exhaust gases away from the engine and into the rest of the exhaust system. A cracked exhaust manifold not only results in noise, but can also cause engine performance problems. This is because...

Q: Engine problem - 2009 Toyota FJ Cruiser

Hello. A knocking sound when starting from a stop in second gear is to be expected. This sound will come from either the motor or the transmission. I don't recommend starting off in second gear. It isn't good for your...

Q: Tire damage? https://drive.google.com/file/d/0B1OuUJ2C7IHAd1lGTGZwQm5nMnc/view?usp=drivesdk

Without a doubt, that tire should be replaced immediately !! The sidewall is the thinnest and weakest area of the tire and flexes the most. Although tires are steel-belted, the steel belt is only in the tread area. Sidewalls are...

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...
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...