Crossover owners Nissan Murano often face the need for diagnostics or routine engine maintenance. One of the key technical characteristics that you need to know for a successful repair is the cylinder layout. Incorrect understanding of the numbering can lead to incorrect installation of spark plugs or coils, which will cause interruptions in the operation of the power unit.
Most versions Nissan Murano are equipped with the legendary VQ series engine, which has a V-shaped “six” configuration. Understanding exactly how the cylinders are positioned relative to each other and the car body is critical for performing work such as changing oil, spark plugs, or diagnosing the ignition system. In this article we will analyze in detail all the nuances of the scheme so that you can carry out the necessary manipulations yourself.
Engine Configuration and Basic Principles
The heart of most models Nissan Murano first, second and third generation is a gasoline engine volume 3.5 liters. This unit belongs to the VQ family, which is famous for its reliability and high power. The engine configuration is a V6, which means the six cylinders are split into two banks at a 60-degree angle.
It is important to understand that this layout creates certain difficulties when accessing some elements. The cylinders are located not in one line, but in two rows: the right row (Bank 1) and the left row (Bank 2). In this case, the crankshaft axis passes through the center between these rows, ensuring balance and smooth running.
Many owners mistakenly believe that the numbering starts from left to right of the driver. However, in the technical documentation Nissan a different system has been adopted, based on the position of the cylinder relative to the engine, and not relative to the passenger compartment. Correctly identifying the cylinder banks is the first step to successful diagnosis.
Cylinder numbering scheme for Nissan Murano
To carry out the work correctly, you need to know the exact numbering. On the engine VQ35DE or VQ35HR, installed on Nissan Murano, numbering is as follows:
- 🔥 The right bank of cylinders (Bank 1) includes cylinders: 1, 3, 5.
- 🔥 The left row of cylinders (Bank 2) includes cylinders: 2, 4, 6.
- 🔥 Numbering inside each row starts from the front end of the engine (radiator side) and goes to the rear (towards the transmission).
Thus, cylinder number 1 is always in the right bank closest to the radiator. Cylinder number 2 is located in the left row opposite the first. Cylinder number 3 is in the right row behind the first, and cylinder number 4 is in the left row behind the second, and so on until the sixth cylinder, which is at the very end of the left row, closer to the transmission.
⚠️ Attention: Incorrect identification of cylinder banks may lead to an error when reading fault codes. If the oxygen sensor (lambda probe) shows an error on Bank 1, this means a problem in the right lane, and not in the left.
When visually inspecting under the hood, it is important to remember the location of the intake manifold. On many versions Nissan Murano The intake manifold blocks access to the rear cylinders, which requires a specific removal technique to replace the spark plugs in cylinders 5 and 6.
Features of the location of ignition coils and spark plugs
Ignition system on Nissan Murano uses an individual coil for each cylinder. The coils are mounted directly on the spark plugs, which simplifies the design, but complicates access to the rear elements. The arrangement of the coils strictly follows the numbering of the cylinders.
For the right row (cylinders 1, 3, 5), access to the coils is usually freer, since this row is located on the side of the front fender, where there are fewer attachments. However, the left bank (cylinders 2, 4, 6) is often blocked by the intake tract and other components, especially in the area of the 6th cylinder.
- 🔧 The cylinder 1 coil is located closest to the radiator on the right side of the engine compartment.
- 🔧 The cylinder 6 coil is located deep in the engine compartment, closer to the transmission and left fender.
- 🔧 There are no high voltage wires, since the coils are installed directly on the spark plugs.
When replacing spark plugs, you must use a special extended spark plug wrench to reach the rear cylinders. Incorrect tightening order or improper installation of the O-rings can result in misfire and vibration.
If you notice that the engine is unstable, check the coils in the rear row. Often the problem lies in overheating or mechanical damage to the spark plug insulator in cylinder 5 or 6 due to difficult access and high temperatures in this area.
- VQ35DE (3.5 l)
- VQ35HR (3.5 l)
- VQ35DE (2.5 l)
- Other
Technical characteristics of cylinder banks
For a clear understanding of the differences between cylinder banks, we provide a summary table that will help when ordering spare parts and diagnostics. Please note that the engine management system sensors are also linked to specific banks.
| Parameter | Right Row (Bank 1) | Left row (Bank 2) |
|---|---|---|
| Cylinder numbers | 1, 3, 5 | 2, 4, 6 |
| Position relative to body | Right side (moving forward) | Left side (moving forward) |
| Availability of candles | High | Medium/Low |
| Oxygen sensor (upper) | Before Bank 1 | Before Bank 2 |
| Oxygen sensor (lower) | After catalyst Bank 1 | After Catalyst Bank 2 |
Understanding this table is critical when reading errors through an OBD-II scanner. Codes starting with P0301, P0303, P0305 indicate misfire in the right lane, and P0302, P0304, P0306 indicate misfire in the left lane. This allows you to quickly narrow down the troubleshooting area.
⚠️ Attention: When replacing catalysts or lambda probe sensors, always check which bank you service. An error may result in a malfunction of the exhaust gas recirculation (EGR) system or incorrect fuel trim.
Diagnostics and replacement of spark plugs
The procedure for replacing spark plugs Nissan Murano requires accuracy and knowledge of the location of the cylinders. Before starting work, it is necessary to de-energize the ignition system by disconnecting the negative terminal of the battery. This will prevent accidental short circuits and damage to electronic control units.
First, remove the engine trim cover that covers the intake manifold and coils. Then carefully disconnect the connectors from the ignition coils. Use only original or certified connectors to avoid contact problems.
☑️ Preparing to replace spark plugs
Access to cylinders 5 and 6 may require removing the intake manifold or even removing the throttle body. Do not try to force the process, as the plastic of the intake manifold is Nissan Murano may be brittle at low temperatures.
- 🛠 Use a torque wrench to tighten new spark plugs to the torque specified in the instructions (usually 20-25 Nm).
- 🛠 Apply a small amount of copper grease to the spark plug thread to facilitate subsequent dismantling.
- 🛠 Check the gap on the spark plugs, although in modern models it is often set by the factory and does not require adjustment.
After installing new spark plugs and coils, be sure to clear the area around the spark plug wells of dust and debris to prevent particles from getting inside the cylinder when starting the engine. This can lead to serious damage to the piston group.
What to do if the spark plug is stuck?
If the candle sticks, do not use excessive force. Use a penetrating lubricant (such as WD-40) and let it sit for 10-15 minutes. Try gently rocking the wrench to break up the corrosion. If the spark plug still won't come out, you may need to remove the cylinder head, but this is a last resort.
Engine management system and sensors
The electronic control unit (ECU) constantly monitors the performance of each cylinder. The knock, crankshaft and camshaft sensors are positioned to ensure that fuel and spark are synchronized at exactly the right time. On Nissan Murano the ignition system is controlled individually for each cylinder.
It is important to note the location of the camshaft position sensors. They are located on the front of the engine, on the timing drive side. Errors in their operation often mimic problems with specific cylinders, although in fact the problem is timing.
When diagnosing the ignition system, do not forget to check the integrity of the wiring going to the coils. Wire insulation on Nissan Murano may dry out and crack over time, leading to electrical leaks and misfires, especially in rainy weather or high humidity.
Before purchasing new ignition coils, check the markings on the old ones. The VQ35DE and VQ35HR engines use different types of coils and mixing them up can result in failure of the new parts.
Common cylinder related problems
The most common problem with VQ series engines is Nissan Murano is a failure of the ignition coils in the rear row of cylinders. Due to high temperature and vibration, the insulation of the coils deteriorates faster than in the front row. This manifests itself in the form of engine tripping and loss of power.
Another common problem is the occurrence of piston rings in cylinders 4 and 5. This is due to the cooling and lubrication features in these areas. Symptoms include increased oil consumption and the appearance of blue smoke from the exhaust pipe during acceleration.
It is also worth monitoring the condition of the valve cover gasket. On Nissan Murano it often leaks and oil can flow into the spark plug wells. Oil getting on the spark plugs causes misfires and can lead to coil failure. Regularly checking the oil level and the condition of the gaskets will help avoid costly repairs.
If you experience vibration at idle, check the engine mounts first. However, if the vibration is accompanied by jerking, the problem is most likely in the ignition system or fuel system of a particular cylinder. Use a scanner to check for misfires on each cylinder individually.
Regular replacement of spark plugs and coils, especially in the rear cylinder bank, extends the life of the VQ35 engine and prevents costly ignition system repairs.
Conclusion
Knowledge of the location of the cylinders on Nissan Murano is a fundamental skill for any owner of this vehicle. Correct identification of banks and cylinder numbering allows you to accurately diagnose faults, select the correct spare parts and perform maintenance without extra costs.
Don't forget that the VQ35 engine is a complex and technologically advanced unit. It is important to be careful and use the right tools when carrying out work. If you are not confident in your abilities, it is better to contact qualified specialists so as not to aggravate the situation.
Keep an eye on the condition of the spark plugs, coils and gaskets, and your Nissan Murano will delight you with reliable operation and dynamic overclocking for many years. Remember that prevention is always cheaper and easier than major engine repairs.
Interesting fact about the VQ engine
The VQ series engine has received the title of "Best Engine of the Year" more than 30 times in a row. On Nissan Murano it has been installed since 2002 and has proven its reliability and efficiency in a wide range of operating conditions.
How to determine the cylinder number without disassembling the engine?
The cylinder number can be determined by the markings on the cylinder head or by the location of the spark plugs. Cylinder 1 is always closest to the radiator in the right bank (Bank 1). For accurate identification, you can use an endoscope through the spark plug hole, but it is better to follow the diagram in the service book.
What spark plugs are best for Nissan Murano?
We recommend original Nissan iridium spark plugs or their high-quality analogues from the NGK and Denso brands. It is important to maintain the correct clearance and tightening torque. Using cheap analogues can lead to unstable engine operation and damage to the coils.
Why does the engine in a Nissan Murano stall?
The most common causes: failure of the ignition coil, worn out spark plugs, faulty injector or compression problems in a specific cylinder. For accurate diagnosis, it is necessary to read the error codes and perform a compression test.
Is it possible to change candles in only one row?
Although technically possible, it is highly recommended to change the spark plugs on all cylinders at the same time. The spark plugs wear out evenly, and replacing only part of the set can lead to an imbalance in engine performance and increased fuel consumption.
Where is the coolant temperature sensor located?
Coolant temperature sensor on Nissan Murano usually located on the thermostat housing or intake manifold. Its exact location depends on the year of manufacture and modification of the engine, but it is always in the area of contact with the coolant.