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?

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

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: Truck won't start.

Since the fuel pump was replaced, check to see if there is fuel pressure to the fuel injectors. If there is good fuel pressure, then check for spark on the spark plugs. You will have to put on a spark...

Q: Starting issue in the Morning

As a general rule, car engines do not like cold weather and do not do operate as well in cold weather. When you start your car in the morning and turn the key to on, the coolant temperature sensor immediately...

Q: Power loss, won't go up hill.

If your engine is revving but the vehicle is not maintaining speed on hills, then the transmission may be slipping due to internal clutches. Have the fluid checked by an expert to see if it is burned or has metal...

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...
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...