Skip the auto shop - Our mechanics make house calls

Q: burning oil

asked by on

Suzuki Vitara 2.0 v6 1997. About five years my car burns and consumes lots of oil and idling rough(1.6RPM on working temperature). The smoke is white to blue, no coolant consumption or leaks around. Many mechanics would say to change the engine. Accidently when checking the oil level I forgot to put back the deep stick. After few miles it stopped burning oil allmost at all but still rough idling. Any idea what would be the reason for this, can we exclude expensive repair? Thanks a lot

My car has 100000 miles.
My car has a manual transmission.

A: If the Positive Crankcase Ventilation (PCV)...

If the Positive Crankcase Ventilation (PCV) system is blocked, crankcase pressure will rise, which tends to draw oil into the combustion chambers (on the intake stroke) where the oil is then of course burned. In the case of such a PCV blockage, leaving off the dipstick would create an escape route, to the atmosphere, for the excess crankcase pressure, thus tending to reduce the oil consumption. The rough running could be due to fouled plugs and possibly a blocked catalytic converter as burning oil will wreak havoc on those components. However, there are many potential causes of rough engine idle ranging all the way from the mechanical condition of the engine, such as uneven cylinder pressures, to faulty fuel supply, ignition or air induction components. If you desire, during a mobile diagnostic a certified Mechanic from YourMechanic can check out the PCV system and diagnose the rough running engine.

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: My Ritz zxi starts at third key press and does not go over 75 speed

Hi there. Check the fuel filter and also check the fuel pressure regulator. the fuel filter could be plugging up causing a restriction for highway speeds. Also the regulator could be dropping at a steady high rpm on the highway....

Q: Car died while driving now won't crank

At 150 thousand miles it really could be anything. I'm not clear on weather you have a car that will not start or one that will not crank. A car that will not crank may have problems in the charging...

Q: My car is sluggish and struggles going uphill.

Hello. If the engine revs up and the vehicle is not responding then it is usually caused by a slipping transmission. If it is just a power loss, then the issue may be a bad catalytic converter clogging the exhaust....

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...