Q: Smoking exhaust on starts

asked by on

Every time my car sits for a while and then I start it, it emits a cloud of smoke from the exhaust. It goes away right after a few seconds. It's only when I first start it. Can you tell me what this could be?

A: The smoke coming from your exhaust may be f...

The smoke coming from your exhaust may be from three things. The normal start up moisture in the exhaust is considered normal if the smoke looks white and is not too heavy and goes away within a minute. The next cause is coolant entering the combustion chamber and this would emit a white smoke also, but will tend to get worse or will not go away in most cases. This is usually due to a gasket leaking. You may also notice the coolant level may be going down and you have to add coolant. The last cause would be oil getting into the combustion chamber. The smoke would have a blue to black tint to it and may leave an oily residue on the tail pipe. The oil could get into the chamber through the valve seals and guides or the piston rings. The engine may also use excessive amounts of oil. You may want to have a mechanic, like one from YourMechanic, come inspect your vehicle's exhaust smoke to see if there are any major problems that should be fixed.

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・Save up to 30%

Get a quote

What others are asking

Q: Oil on spark plug

There can only be two ways the oil is getting on the spark plug. The piston oil control rings are stuck or broken and letting excess oil into the cylinder. The intake valves seals for the cylinder...

Q: gear not working on D , L , 1, 2. Reverse is working ok

Transmission concerns can be tricky to determine. In your case, you could have a problem with the shifter valve body located within the transmission. It controls the flow of fluid to engage or disengage the different clutches that allow for...

Q: Water coming out of the exhaust pipe

Hello. Water coming out of the exhaust pipe is usually an indication of a blown head gasket. The head gasket is located between the engine block and the cylinder head. Antifreeze runs over the head gasket and when working properly....

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.