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.

A: Hi there. Check the engine oil level and s...

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!

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: Glove box stuck closed.

I would take that car to the dealer and have them open the glove box. Whatever you do do not force it because it can damage the glove box and may cost around $600. It is common that the manual...

Q: Is Chevy Equinox 2006 worth replacing oil pan gasket? 198,000 miles

Hi there. Replacing the oil pan gasket is part of an engines life and part of a vehicle's maintenance. Every vehicle will eventually need to have the oil pan gasket replaced. Before you replace the oil pan gasket, look around...

Q: Car wont start.

Since the vehicle is trying to start itself, you can start looking for a problem in the ignition circuit. A relay that may have corrosion inside can short and turn on the circuit that control the starter or the ignition...

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...