Skip the auto shop - Our mechanics make house calls

Q: I have a 2014 nissan maxima. It smoking from the exhaust with a blueish gray look. There's no oil leaks on the ground.

asked by on

There no leaks on the ground. I cleaned both valve covers and drop the oil pan an cleaned it. Thete was alot of gunk in the valve covers an the oil pan on the screen it cleaned them. The car still smokes i checked all the gaskets all are good. What could be my problem. Please help! Motor doesn't run hot an car idals fine.ni knocking in the motor. ??

My car has 74000 miles.
My car has an automatic transmission.

Hi there. Check the engine oil level and see how low it is. If the oil is a little low, then the oil is burning in the exhaust system. This is caused by the valve guide seals leaking, the rings not seating, or the PCV (positive crankcase valve) not releasing properly causing too much pressure in the crankcase. Check the intake and air filter for any signs of oil. If oil is present in the intake or air filter, the change the PCV. If the air intake is clean, then check the compression on the engine. The first puff of the compression should be half of the max puff. This will tell you that the rings are sealing. If the first puff is very low, then the rings are not sealing properly. You can put in sea foam in the fuel tank and in the engine oil to clean up the rings to seat them. If the puff is half or higher, then the valve guide seals need replaced. If you need further assistance with your engine burning oil, then seek out a professional, such as one from Your Mechanic, to help you.

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!
  1. Home
  2. Questions
  3. I have a 2014 nissan maxima. It smoking from the exhaust with a blueish gray look. There's no oil leaks on the ground.

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: Brake issue and brake lights on - 2014 Infiniti Q50

Hello. It sounds like the pedal is either binding or this is being caused by a bad brake switch (more common). When the switch fails it can cause this to occur. This should be covered under warranty since your vehicle...

Q: Oil was accidentally over filled.

Hi there. Wen the engine was overfilled by an additional quart of engine oil, then the engine was trying to lock up as the crankcase pressure was too high and the pistons are pressing against the oil. I recommend draining...

Q: Radiator fan not working

Hello. If one fan is not working and the other is, I would suspect a faulty fan. To verify that the fan is bad, check the voltage signals on the fan to determine if it's getting power. A technician from...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...