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

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: Car not starting

Hi there! There are a few possible causes for your concern. Your engine needs several things in order to run properly: Fuel from the fuel tank, spark from the ignition system to ignite the fuel, and pressure in the cylinders...

Q: Helicoil fell into spark plug well. what do I need to do to get it out. thank you.

There are only a couple things to try. One way is to use a magnet like you've already tried to get into the cylinder. I'm not sure what kind of magnet you used but you may have to use a...

Q: Problem with the triggering system on the coil ? Can the coil go bad and get out of time on firing? 1996 Mercury Grand Marquis

Hello - no, the coils cannot vary timing, they are responsive to whatever timing trigger is passed to them (crankshaft or camshaft position sensor, ignition control module, distributor, etc.). The coil which services Cyl 5 could be failing however -...

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...
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...
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...