Q: Smoke from my exhaust while I am driving down the road

asked by on October 31, 2016

Hi how are you I noticed a smoke from my exhaust while i am driving down road on the high way when i pull up my feet from the pedal then put it to drive the smoke comes out what its mean i have no overheating the car works properly but my check engine light on from month ago and I replaced the ccv because i have oil burn the oil burn now decrease after this replacement but I still burning some oil

Hey there. Valve stem oil seals (in the cylinder heads) do not last forever and their failure is a possible cause, or contributing cause, to oil getting into the combustion chambers and then burning. Of course, it is also possible that oil is being drawn into the combustion chamber(s) due to worn out piston rings.

If the engine has high mileage (over 150,000 miles), that possibility can be investigated by doing a compression test and subsequent test with oil in the cylinder to see to what extent if any compression rises as the oil "seals" the possibly leaking rings in the cylinder. You should also check to make sure the PCV (positive crankcase ventilation) system is free and clear and operating properly. Failures there can cause oil to be forced into the cylinders when engine vacuum is high (like when you take your foot off the gas). All of these possibilities can be examined by a certified mechanic, like one from YourMechanic, to diagnose the smoke issue.

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


Experienced Mechanic?

Earn up to $65/hr

What others are asking

Brake pedal too close to gas pedal - 2010 BMW 335d

The most practical way to deal with this is to consciously practice moving your foot further to the left when braking. It's not likely any shop would modify your brake pedal to move it to the left - for liability...

Squealing when I push the gas won't go over 3000 rpm 30 mph at most.

The lack of power you are describing may be related to a clogged catalytic converter. As you may already know, the catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere....

Codes P0171 and P0442 - is it a gas cap issue?

Hello. These "small leak" codes can be very frustrating! Both of these codes (P0171 - lean condition, P0442 - small evaporation system leak) are the result of an air leak in the engine's air intake system. Causes can be leaks...

Low Fuel Light on with fuel in tank

The fuel level sensors on some of these vehicles tend to be misread by the computer, causing faults in the system. The fuel sensor would need to be inspected, and the engine computer scanned, to see if the codes received...

Oil leaked out, van ran hot and radiator had a leak oil was splattered everywhere and backed up into the coolant jug 2002 Ford E350 Super Duty

Hello - I suspect you will find blown head gaskets based on the oil in the coolant" observation, with indications of extremely high pressure coming into the cooling system. Hopefully the determination you have that cylinder heads themselves were not...

Ac compressor clutch isn't engaging on high fan speed setting while it engages on the prior three fan speeds which are all slow.

The blower not working is most likely due to a fault with the blower resistor. When you go to high blower speeds the A/C may disengage the compressor if the cycling switch cycles or the high pressure switch gets over...

Headlight assembly not working

On a vehicle such as a Porsche, it is likely that there is a control module for each of the headlight assemblies. A control module is like a computer that controls a particular system. If all of the lights on the driver side...

Why does my car have to turn over a couple times when it is mildly warm?

You may have a problem with injector leakage. When the car has been running the fuel system stays pressurized for a few hours. When the injector valves are old, there may be a small amount of leakage at the tip...

Car overheating after replacing radiator and no heat thru vents

Hi there. The problem is more than likely due to an obstruction of some sort within the heater core, or the heater control valve is not working as it is intended. You might want to watch this video on how...

Related articles

Is it Safe to Drive With an Exhaust Leak?
Your vehicle’s exhaust system keeps the car quiet and the exhaust fumes away from the cabin. Furthermore, the system helps...
Why Do Some Cars Have Really Smelly Exhaust Fumes?
Smelly car exhaust fumes mean that something is going wrong. It could be leaking fluids, a failing catalytic converter, or imbalanced air/fuel mix.
How Long Does an Exhaust System Hanger Last?
Your Your exhaust system takes quite a beating while it is suspended under your car. Think about it - you're traveling at high speeds, over bumps, through unfavorable road conditions, and much more. If it wasn't properly affixed to the...