Skip the auto shop - Our mechanics make house calls

Q: Bad misfiring issue - 2004 Nissan 350Z

asked by on

My car burns oil out of both tailpipes is constantly low on oil and is misfiring. All of the spark plugs and coils are fine. Cylinder twos compression has only 60psi and cylinder five is always failing the spark plug with soaking it in oil. What could this be?

My car has 127000 miles.
My car has a manual transmission.

A: Engine misfires can be caused by a list of ...

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark related problems generally will result from things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition modules not working properly.

In your case, the low cylinder compression suggests that you may have excessively worn piston rings in cylinders #2 & 5, which can allow the oil to pass by the piston up into the combustion chamber causing the oil to be burnt along with the fuel. This will cause the motor to lose oil quickly and the spark plugs to foul out often. The result of a misfire or an explosion in that cylinder that is much less powerful than the other cylinders creates a loss of power that resonates throughout the motor additionally causing other problems with ignition and fuel timing.

If you'd like to get this fixed, I would recommend having an expert from YourMechanic come to your location to diagnose your misfiring problem and make the necessary repairs to your vehicle.

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

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: Car makes whirring noise and car doesn't start.

I would have the battery tested by a certified technician such as one from Your Mechanic. It sounds like the battery may be dead but they also need to determine if the charging system is working correctly.

Q: Bled clutch started my truck peddle died immediately and fluid poured out from the transmission, is it my slave cylinder?

Hello. If your clutch pedal went soft and a leak developed then it may very well be possible that the slave cylinder may be bad. If the clutch slave cylinder receives pressure from the pedal, and if it leaks will...

Q: Car is not firing on the first two cylinders

This is generally related to spark problems when it is more consistent. Spark related problems generally will result from things like ignition coils, crankshaft position sensor, spark plugs, spark plug wires or ignition modules not working properly. As you know,...

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...
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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...