Skip the auto shop - Our mechanics make house calls

Q: White smoke emitted after starting car and gas smell

asked by on

When trying to start my car, it can take up to 20-30 seconds for it to fully start. After it does start, white smoke comes out for a couple of seconds. Then there is a puffing type of sound like pa-pa-pa. Along with this I can smell gasoline. Also the engine independently revs; I am not pressing on the gas pedal. What is causing all these problems and what are the solutions?

A: White smoke out the tailpipe is usually a s...

White smoke out the tailpipe is usually a sign of coolant leaking into the exhaust or cylinder. This is usually caused by a blown head gasket, cracked cylinder head, or cracked engine block. It will also cause a misfire similar to what you describe. Have a professional mechanic such as YourMechanic do a compression and coolant leak test to determine if you have one of these issues before further damage is done.

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・Save up to 30%

Get a quote

What others are asking

Q: Anti-theft light is on

If the anti-theft light is on, but not blinking, that signifies that the anti-theft system is armed, and ready to use. When it is activated, it will blink, and the vehicle will not start unless the correct key is used,...

Q: Brake lights not working

The stop lamp switch most likely failed and is not making contact internally. The switch may need to be adjusted or replaced. I recommend seeking a technician, such as one from YourMechanic, to come and test your vehicle's brake lights...

Q: The car occasionally idles high until it stalls

It sounds like this is an intermittent issue. These are generally the hardest to diagnose because they are just infrequent enough to not trip the ECU into triggering a code, but they still have a fault somewhere. The most common...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...