Crossover owners Nissan Murano Z52 generations often face the need to service the ignition system, as this engine requires special attention to the quality of spark generation. The VQ35DE power unit installed on this model has a high compression ratio and is condition sensitive spark plugs. Ignoring replacement times or using incompatible analogues can lead to serious problems with engine operation, including misfires.
During operation at Nissan Murano Z52 There is a gradual burnout of the electrodes and contamination of the ceramic insulator. This directly affects the combustion efficiency of the fuel mixture and, as a consequence, the dynamics of acceleration and fuel consumption. Correct selection spare parts and compliance with maintenance regulations are the key to long engine service without expensive repairs.
Replacement procedure and signs of malfunction
Factory regulations for the VQ35DE engine require replacement spark plugs every 100,000 kilometers, however, actual operating conditions often dictate different timing. In conditions of dense city traffic, constant traffic jams and short trips, the resource of the elements can be reduced to 60,000 - 70,000 kilometers. If you notice that the car has become less traction or fuel consumption has increased, it is worth carrying out unscheduled diagnostics.
Symptoms of worn spark plugs Nissan Murano can be varied and not always obvious at the initial stage. The most common symptom is unstable engine operation at idle, when the tachometer needle begins to float. The owner may also experience jerking during acceleration or difficulty starting the engine in the cold season.
- 🚗 Increased fuel consumption for no apparent reason
- ⚡ Misfires, which are recorded by the on-board computer (error P0300-P0306)
- 🔋 Difficulty starting the engine, especially after parking overnight
- 📉 Loss of power when overtaking or going uphill
It is important to understand that delay in replacement can lead to failure of the ignition coils. On Nissan Murano Z52 The ignition system is designed so that each coil works on one specific spark plug. If the spark plug is broken or has too much gap, the coil is overloaded and overheats.
⚠️ Warning: Ignoring misfire errors may result in overheating of the catalytic converter. Replacing spark plugs with Nissan Murano is not only a matter of power, but also the preservation of expensive exhaust system components.
Original candles and their analogues
When choosing components for Nissan Murano Z52 Most experts recommend focusing on original parts or proven brands specializing in Japanese cars. Original spark plugs from Nissan are often produced by NGK or Denso, which simplifies the search for analogues. The key parameters are the thread length, diameter and gap between the electrodes, which are strictly regulated by the manufacturer.
There are several types of spark plugs on the market suitable for the VQ35DE engine. Standard nickel spark plugs have a shorter lifespan, but are cheaper. Iridium or platinum models provide a more stable spark and last longer, which is critical for modern direct injection engines.
- 🏆 Original article: 22401-1CA0A (NGK Laser Iridium)
- 🔧 Proven analogue: NGK SILZKBR8D8S (9603)
- ⚙️ Alternative: Denso SK20R11 (Iridium TT)
- 📉 Budget option: Bosch FR7NPP332 (requires frequent replacement)
Never install spark plugs with a known inappropriate heat rating. If you choose a spark plug that is too hot, this can lead to hot ignition and burnt pistons. A spark plug that is too “cold” will quickly become contaminated with carbon deposits, which will cause misfires.
- Every 100,000 km (according to regulations)
- Every 60,000 km (caution)
- I only replace it when it breaks.
- I bought a new one, haven't changed it yet
The use of counterfeits is a common problem when purchasing spare parts. Fake spark plugs often have incorrect clearance or low-quality ceramics, which leads to their rapid failure. Always check the packaging, the presence of holograms and the quality of the molding of the case before installation.
⚠️ Attention: Buy spare parts only from authorized dealers or trusted stores with a good reputation. Saving on spark plugs can cost tens of times more when replacing ignition coils or repairing an engine.
Replacement process and necessary tools
Replacing spark plugs with Nissan Murano Z52 - a procedure that requires certain skill and the presence of specialized tools. Access to the spark plugs is complicated by the design of the engine compartment, where the engine fits tightly to the body and other components. You will need a long wrench, a set of sockets and, of course, a spark plug wrench with a magnetic holder or rubber insert.
Make sure the engine is completely cool before starting work. The hot aluminum of the cylinder head can warp if it cools suddenly or if it is turned too hard. It is also important to disconnect the negative terminal of the battery for safety.
- 🔩 Spark plug wrench (usually 16 mm or 5/8 inch with extension)
- 🔧 Ratchet and cardans for access to hard-to-reach places
- 🌬️ Compressed air or a can of compressed air for cleaning wells
- 🛠️ Torque wrench for proper tightening
The process begins by removing the decorative plastic engine cover. Then you need to carefully disconnect the ignition coil connectors and unscrew the bolts securing the coils themselves. After removing the coils, spark plug wells will open in front of you.
☑️ Preparing to replace spark plugs
Technical nuances and installation errors
One of the most critical mistakes is the incorrect tightening torque of the spark plugs. If you tighten them too loosely, the spark plug may overheat or fly out due to vibration. Over-tightening can strip the threads in the cylinder head, requiring costly repairs involving replacement of the entire head. Use a torque wrench and refer to the instructions.
For a VQ35DE engine, the tightening torque is typically around 13 Nm. If you don't have a torque wrench, you can use the eyeball method, turning the spark plug 1/4 or 1/2 turn after touching the threads, but this is less accurate. It is better to entrust this stage to professionals or practice on old candles.
Before installing a new spark plug, be sure to clean the well from dust and dirt. The entry of foreign particles into the cylinder during replacement can lead to scoring on the cylinder walls and catastrophic consequences for the piston group. Blow out the installation site with compressed air.
What to do if the candle is stuck?
If the spark plug cannot be unscrewed, do not use excessive force to avoid breaking it. Use a penetrating lubricant (WD-40 or equivalent), give it time to work, and try heating the joint with a hair dryer. If the spark plug does break, professional removal of the remains will be required using an extractor or drilling.
Also pay attention to the condition of the ignition coil gaskets. Over time, rubber hardens and cracks, which can lead to oil leakage into the spark plug wells. If there is oil, it must be completely removed, otherwise it will burn off the spark plug, causing carbon deposits and misfires.
Using a torque wrench when installing spark plugs on a Nissan Murano Z52 is mandatory to prevent damage to the cylinder head threads.
Influence of fuel quality and driving style
To the candle resource on Nissan Murano Z52 directly affects the quality of the fuel used. Gasoline with a low octane number or a high content of impurities contributes to the rapid formation of soot and deposits on the insulator. This disrupts heat dissipation and can lead to premature failure of the element.
Driving style also plays a role. Aggressive driving with constant sharp acceleration and high speeds increases the thermal load on the engine and spark plugs. In such conditions, iridium electrodes burn out faster than during calm, measured driving on the highway.
Owners who often drive around the city in start-stop mode should be prepared for the fact that the life of the spark plugs is reduced. Under such conditions, incomplete combustion of fuel occurs, which leads to clogging of the spark plugs with carbon deposits. Regularly checking the condition of the electrodes will help avoid sudden breakdowns.
| Fuel type | Impact on resource | Recommendation |
|---|---|---|
| AI-92 (not recommended) | Heavy carbon deposits, risk of detonation | Do not use |
| AI-95 (standard) | Normal operation | Change every 80-100 thousand km |
| AI-98/100 (premium) | Stable operation, less carbon deposits | You can increase the interval |
⚠️ Attention: Using low-quality fuel can lead to detonation, which destroys the piston group of the VQ35DE engine faster than the wear of the spark plugs.
Diagnosis of the condition by appearance
After unscrewing the spark plugs, you can conduct a visual analysis of the engine condition. The color of the deposit on the electrode speaks volumes. A light brown or grayish color is considered normal. If the carbon deposits are black and smoky, this indicates a rich fuel mixture or problems with the crankcase ventilation system.
White or gray carbon deposits with a melted electrode indicate that the mixture is too lean or the engine is overheating. In such cases, it is necessary to check the cooling system, oxygen sensors and injectors. Oily carbon deposits indicate that oil has entered the combustion chamber, which may be a result of worn valve stem seals or piston rings.
- 🔥 Reddish soot - traces of additives in the fuel (not critical, but shortens life)
- 🌑 Black carbon – problems with the fuel supply or ignition system
- ⚪ White carbon – overheating or lean mixture
- 🛢️ Oil deposits - problems with engine seals
Regular diagnostics allow you to identify hidden engine problems at an early stage. Don't neglect this simple method, which can save you significant money on future repairs. Compare the condition of the spark plugs with the standards given in the technical documentation.
Store one old candle in a clean container as a sample of "normal" condition. This will help you in the future to quickly assess the condition of new spark plugs during a visual inspection.
Frequently asked questions and answers
Many owners Nissan Murano Z52 They ask questions about the specifics of servicing the ignition system. Below are answers to the most popular of them, based on operating experience and data from service centers.
Is it possible to change spark plugs one at a time?
Not recommended. If one candle fails, it means that all the others have spent the same amount of time. Replacing only one will lead to unbalanced cylinder operation and uneven wear. Change the set immediately.
Do I need to lubricate the spark plug threads before installation?
No, lubricant the spark plug threads Nissan Murano Z52 prohibited. This may change the tightening torque and cause the spark plug to come loose or damage the threads. The only exception is a drop of anti-oxidant on the metal body (not on the threads or on the electrode) if you live in conditions of severe corrosion, but it is better not to do this.
How often should you check the spark plug gap?
Modern iridium and platinum spark plugs (such as the original ones for Murano Z52) have a non-adjustable gap that does not require checking or adjustment. If you are using regular nickel spark plugs, the gap should be checked with a feeler gauge before installation, but their use on this engine is not recommended.
What to do if after replacing the spark plugs the error does not disappear?
If the misfire error persists after replacing the spark plugs, the problem may be in the ignition coil, wiring, or the engine itself. Check the resistance of the coils, the integrity of the wires and the presence of oil in the spark plug wells.
Can I use spark plugs from other Nissan models?
Only if they have identical technical characteristics: thread length, thread pitch, heat rating and wrench size. Items may differ, but the parameters must be the same. It is better to use specialized candles recommended specifically for VQ35DE.
Taking care of the ignition system is the basis for the reliability of your Nissan Murano Z52. Regular replacement spark plugs and the use of high-quality components will ensure smooth engine operation, comfortable operation and fuel economy. Don't put off maintenance until later to avoid serious damage in the future.
Remember that proper car care begins with attention to detail. The condition of the spark plugs is an indicator of the health of the entire engine. Follow the regulations, choose trusted brands and enjoy driving your crossover.