Q: Bad misfiring issue - 2004 Nissan 350Z

asked by on November 14, 2016

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.

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.

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・Fair and transparent pricing

What others are asking

Code P0420. Need to replace catalytic converter.

Hi there. The code P0420 is coming up for the Downstream Oxygen sensor has picked up an abnormal reading and is saying that the catalytic converter is below threshold. There could be a misfire on the engine, leaking injector, ignition...

How do I know if I have a bad coil or a bad fuel injector?

The easiest way to test for spark is to pull the spark plug boot off of the number 3 cylinder spark plug and install a spark tester. Most auto parts stores have them for a few bucks. The spark plug...

Security light flashes rapidly trying to start truck everything comes on but it won't start

You may still be in lockout and the security system is keeping you from starting the car. When the car was entered without the key, it no doubt triggered the immobilizer and that will have to be reset. It's might...

Ignition lock damaged

You may need to replace the entire steering column, or just the key cylinder; only a visual inspection can verify the extent of the damage, and what parts would be needed for repair. I would recommend having a certified technician,...

Truck making noise

Hello, diagnosing a noise is a hands on and must be heard. Since you notice that it is making the noise while starting the car, there are several possible causes. The noise could be coming from the starter, the flywheel,...

3 part question. I have a 1994 chrysler lhs thats had the timing belt go out

The 3.5 ltr V6 is an interference engine. That means the valves and the pistons occupy the same space but at different times. The timing belt keeps the cams and crankshaft spinning in the proper time, so the valves and...

Slow leak in tire

Hello. It is common to lose a small amount of air over time. Usually about a pound or two of pressure a month is normal. If it is leaking faster than that then it amy have something stuck in the...

Would the crankshaft be the issue for the car losing power or misfiring gears?

Hi! It sounds like there are a number of things that could be going on with your Mountaineer. If you feel like it's in neutral when you're in drive, that is a transmission issue. You can start by checking the...

Intermittent cylinder number four misfiring, car shakes as if it would stall

Misfiring can generally be either the fuel or it can be ignition. Now, you've changed the spark plugs. But if you have an older car, did you change spark plug coils? If not, change them. If it has coil on...

Related articles

How to Prevent Motor Oil Sludge
Regular oil changing in your car helps prevent sludge. Motor oil sludge can cause worse gas mileage, low oil pressure, and damage to engine parts.
Why Do Cars Have Different Oil Change Intervals?
Car oil change intervals depend on the make, model, and year of the car. The correct type of oil and how the vehicle is used makes a difference too.
A Buyer’s Guide to the 2012 Nissan Sentra
The The 2012 Nissan Sentra is one of the most versatile sedans in its class. Because it has such a wide variety of options available in its four trims, buyers can choose between a bare-bones version at a very affordable...