Spark plugs for Nissan Murano Z50: selection, replacement and nuances

Crossover operation Nissan Murano the second generation (Z50 body) often confronts owners with the need to service the ignition system. This car, equipped with a powerful naturally aspirated V6 engine of the VQ35DE series, places special demands on components. It’s the quality spark plugs depends on the stability of the engine, its dynamics and efficiency. Ignoring replacement dates or installing low-quality analogues can lead to serious malfunctions in the operation of the injection system and misfires.

Many car owners underestimate the role of the spark discharge in the operation of a gasoline engine, considering this part a low-priority consumable. In fact, accurate sparking is critical for the VQ35DE engine, which is a high-tech unit with two camshafts on each cylinder head. If spark plugs worn out, the electronic engine control unit begins to operate in emergency mode, which significantly reduces driving comfort Nissan Murano.

The right choice and timely replacement is the key to ensuring that your crossover will remain a reliable companion for many years. In this article, we will analyze in detail which components are suitable for this model, how to distinguish an original from a fake, and how to carry out the replacement procedure yourself without resorting to service. We will also cover diagnostic issues that will help identify problems at an early stage.

Features of the VQ35DE engine and requirements for the ignition system

Engine VQ35DEinstalled under the hood Nissan Murano Z50, is a high-precision unit with a volume of 3.5 liters. Its design involves the use of an ignition system with individual coils for each cylinder. This means that every spark plug Works in harsh conditions of high pressure and temperature. Particular attention should be paid to the gap between the electrodes, which is strictly regulated by the manufacturer to ensure stable sparking.

It is important to understand that a V-shaped motor has its own specific requirements for the length of the threaded part and the type of thermal range. An incorrectly selected part can lead to overheating or, conversely, to carbon deposits on the electrodes. For Nissan Murano critical to use spark plugs with iridium or platinum coating, since a conventional nickel electrode will not withstand the service life of this powerful power unit.

The ignition system here directly affects the operation of the CVTCS variable valve timing system. If the spark is weak or erratic, the engine computer may mistakenly interpret this as a cam timing problem. Therefore quality spark plugs - This is not just a question of fuel economy, but a fundamental characteristic of the reliability of the entire engine.

• 🔥 The engine operates at high temperatures, so heat-resistant insulator material is required.
• ⚙️ High cylinder pressure requires a durable spark plug housing design.
• 💡 Individual ignition coils are sensitive to the state of the gap on the electrodes.

Original versus analogues: what to choose for Murano Z50?

The undisputed leader in the field of ignition systems for cars Nissan is a brand NGK. Factory original number spark plugs for this model - 22401-ED00A (or its modifications). In most cases, these spark plugs are manufactured by NGK, but are packaged in Nissan branded boxes. The use of original products guarantees compliance with all factory specifications for clearance, threads and thermal values.

However, there are many analogues on the market that offer a more attractive price with comparable quality. Brands like DENSO or Champion also make excellent products compatible with the VQ35DE engine. The main rule when choosing an analogue is not to skimp on the material of the central electrode. Cheap nickel spark plugs will quickly fail and can damage the ignition coils, the repair of which will cost much more than the difference in price.

When purchasing, you should pay attention to the presence of protective film and holograms on the packaging, since the spare parts market for Nissan Murano oversaturated with counterfeit goods. Fake spark plugs often have uneven threads, incorrect clearance and poor insulation, which can lead to high voltage breakdown to the motor housing.

⚠️ Attention: Do not buy spark plugs at junkyards or in unverified stores. For the VQ35DE engine, the risk of installing a fake is too great, as this can lead to overheating of the insulator and destruction of the ceramic housing inside the combustion chamber.

• 📦 Always check the part number on the package: the original is often marked “Nissan Genuine Parts”.
• 💎 Give preference to iridium or platinum spark plugs (LZKR6B-10E or equivalent).
• 🛡️ Check the integrity of the package for signs of opening or poor print quality.

Replacement intervals and symptoms of malfunction

Manufacturer Nissan recommends scheduled replacement spark plugs every 100,000 kilometers for iridium samples. In practice, this period can be reduced to 60,000 – 80,000 km, depending on operating conditions. City mode with constant traffic jams, short trips and engine warming up creates more difficult conditions than the highway, which accelerates the wear of the electrodes.

Symptoms of wear and tear may not be obvious initially. You may notice a slight vibration of the engine at idle or a slight decrease in acceleration dynamics. However, if spark plugs fail critically, the Check Engine indicator will light up, and the computer will display errors associated with misfires (Misfire). Ignoring these signals can lead to catalytic converter failure, which is very expensive to replace.

Regular diagnostics of the condition of spark plugs during scheduled maintenance allows you to identify problems before they become critical. Inspecting carbon deposits, insulator color and electrode condition will provide comprehensive information about the health of your engine.

• 📉 An increase in fuel consumption for no apparent reason may indicate ignition problems.
• 🚗 Difficulty starting the engine in the cold season is a sure sign of electrode wear.
• ⚡ Misfires feel like jerking when you press the gas pedal.

Step-by-step instructions for self-replacement

Replacement spark plugs on Nissan Murano Z50 is a procedure that you can do yourself if you have a basic set of tools and a little patience. It is better to carry out work on a cold engine to avoid burns and deformation of aluminum cylinder heads. You will need a spark plug wrench with an extension, a 16 mm socket, a ratchet and, preferably, compressed air to blow out the wells.

The first step is to remove the plastic decorative engine cover, which is secured with several latches. Next you need to disconnect the connectors from the ignition coils. Be careful not to damage the connector retainers. After unscrewing the bolts securing the coils, they can be carefully removed. It is important to maintain cleanliness: before unscrewing old spark plugs, you need to blow out the area around them with compressed air to prevent dirt from getting inside the cylinders.

The unscrewing process requires care. Make sure the key is level to avoid stripping the threads. After removing the old spark plugs, compare their condition with the new ones. New spark plugs should be screwed in by hand until it stops so as not to damage the threads, and only then tightened with a torque wrench to the tightening torque specified in the manual (usually about 18-20 Nm).

⚠️ Warning: Never use WD-40 or other lubricants on spark plug threads before installation. This may lead to sticking of the spark plugs in the future or disruption of thermal contact with the block head.

• 🔧 Use only a high-quality spark plug wrench with a magnet or funnel to remove the spark plug.
• 🧹 Be sure to clear the seat of debris before installing a new part.
• 📏 Check the gap on new spark plugs, even if they are declared as factory.

Common problems and their solutions

One of the most common maintenance problems Nissan Murano is sticking of spark plugs to the cylinder head. This is due to high temperatures and a chemical reaction between the aluminum of the head and the steel of the spark plug. If you are faced with such a situation, under no circumstances try to unscrew the spark plug with a jerk or with maximum force, as this may lead to the threads in the aluminum head breaking, which will require complex repairs.

Another problem may be a breakdown of the insulator or ignition coil, which is often accompanied by a characteristic crackling sound and the smell of burnt rubber under the hood. In such cases, replacement spark plugs does not solve the problem, and it is necessary to check the integrity of the high-voltage wires (if they are in the system) and the coils themselves. Often coils fail precisely because of old spark plugs with an increased gap.

Sometimes owners are faced with the fact that after replacing spark plugs the engine begins to run unstable. This may be due to the fact that during installation the coils were not fully inserted or the connectors were not connected until they click. It is also possible that there is an error in the gap or oil getting into the spark plug well due to wear on the valve cover seals.

What to do if the spark plug is stuck?

If the spark plug cannot be unscrewed, try warming the cylinder head with a hairdryer or heat gun (without fanaticism). Then apply some penetrating lubricant to the threads and let it soak in for 15-20 minutes. Try unscrewing using the back and forth method with a little force. If all else fails, it is better to turn to professionals so as not to strip the thread.

• 🛠️ If the thread breaks, you will need to install a threaded insert (sleeve), which is a complex procedure.
• 🌡️ Engine overheating can speed up the wear of spark plugs, so monitor the temperature.
• 💧 Oil in the spark plug well indicates the need to replace the valve cover gasket.

The influence of fuel quality on spark plug life

Fuel quality plays a huge role in durability spark plugs on the VQ35DE engine. The use of gasoline with a low octane number or a large amount of impurities leads to the rapid formation of soot and coking of the electrodes. For Nissan Murano It is recommended to use fuel not lower than AI-95, and ideally AI-98, especially with an aggressive driving style.

Poor quality fuel can cause detonation, which is destructive to the piston group and ignition system. Detonation shocks create excess pressure and temperature that can melt the spark plug's center electrode or damage the insulator. That is why the use of additives to clean the fuel system is sometimes justified, but only as a preventive measure and provided that they are compatible with the catalyst.

In regions with harsh climates or poor fuel quality, the resource spark plugs may decrease by 30-40%. In such cases, it is recommended to shorten replacement intervals and diagnose the engine condition more often. This will avoid costly repairs and preserve the engine's full service life.

⚠️ Attention: The use of fuel with an octane rating below 95 for the VQ35DE engine is strictly not recommended, as this can lead to detonation and serious damage to the piston group.

• ⛽ Refuel only at proven gas stations with a good reputation.
• 🧪 Use high-quality fuel system cleaners periodically.
• 🚫 Avoid refueling "from the wheels" or in questionable places, especially when traveling.

FAQ: Frequently asked questions

Is it possible to replace spark plugs in only one cylinder?

No, it is strictly not recommended to change spark plugs one at a time. All spark plugs work under the same conditions and wear out approximately the same. If one fails, the rest will soon require replacement as well. This will ensure smooth engine operation and prevent imbalance in the ignition system.

How to check the gap on new spark plugs?

Using a special gauge, check the distance between the center and side electrodes. For engine Nissan Murano Z50 the standard gap is usually 1.1 mm. If the gap is different, it can be carefully adjusted, but it is better to use spark plugs with a factory gap to avoid mistakes.

What should I do if the Check Engine light comes on after replacing the spark plugs?

First check that the ignition coils are tightly inserted and the connectors are connected. If everything is in order, it is possible that old errors are stored in the ECU memory. Reset errors with a scanner or disconnect the battery for 10-15 minutes. If the error persists, check the spark plugs for installation or defects.

Can candles with a different type of spraying be used?

It is advisable to follow the manufacturer's recommendations. Iridium spark plugs have a longer service life and stability. Platinum ones are also acceptable, but nickel ones will quickly fail. The main thing is that the thermal value and size match the VQ35DE engine specification.

How long does it take to replace spark plugs?

For an experienced master, the procedure takes about 40-60 minutes. If you are doing this for the first time, allow 1.5-2 hours, as it will take time to dismantle the casing, disconnect the coils and carefully install new elements.