The ignition system is one of the critical components of any gasoline engine, and Nissan Qashqai with a 2.0 l engine (MR20DE) is no exception. Over time, the life of spark plugs is exhausted, which leads to unstable engine operation, increased fuel consumption and even misfires. Many car owners believe that replacing this consumable requires complex equipment and a visit to the service center, but the procedure is quite feasible even for a novice technician if he has a basic set of tools and a clear sequence of actions.
Atmospheric engine MR20DE It is reliable, but requires regular maintenance. Ignoring the scheduled replacement of spark plugs can lead to failure of the ignition coils, the repair of which will cost much more than the cost of new components. In this article we will look in detail at how replace spark plugs on Nissan Qashqai J11, what nuances should be taken into account when working with this particular motor and how to avoid typical mistakes that inexperienced drivers often make.
It is important to understand that the engine MR20DE has a design in which access to the rear spark plugs (closer to the passenger compartment) is significantly difficult due to attachments and design features of the body. This is why the replacement process requires patience and the use of specific tools, such as an extended wrench and a universal joint. Proper preparation of the workplace and selection of high-quality spare parts guarantee long and trouble-free operation of the power unit of your crossover.
Choosing the right candles and the necessary tools
Before proceeding with dismantling, you must ensure that you have the correct components. For engine MR20DE The manufacturer recommends using iridium spark plugs, which have a longer service life and stable spark formation. Standard article for Nissan Qashqai 2.0 are original spark plugs with markings 22401-ED01A or their high-quality analogues from brands like NGK or Denso. The use of cheap nickel spark plugs can reduce the service interval to 20-30 thousand kilometers, while iridium spark plugs can last up to 100 thousand kilometers without loss of efficiency.
Tools for replacing spark plugs Nissan Qashqai J11 must be quite extensive, since access to some cylinders is limited. You will need a standard set of sockets, including an extension and universal joint, to reach the rear spark plug. Pay special attention to the spark plug wrench - it must have a magnetic holder or rubber insert to securely hold the spark plug when unscrewing and screwing in. Also, do not forget about a plastic gun for cleaning the spark plug wells from dust and debris.
- 🛠️ Set of sockets with extensions (especially long, about 30-40 cm)
- 🔦 Flashlight for illuminating hard-to-reach places in the engine compartment
- 🧹 Compressed air cylinder for blowing out wells before unscrewing
- 🔑 Torque wrench for precise tightening (torque 25 Nm)
- 🧤 Gloves and safety glasses for hand and eye safety
Car owners often encounter a problem when a spark plug is stuck to the cylinder head. In such cases, you should not use excessive force to avoid stripping the thread. It is best to pre-treat the joint with a penetrating lubricant and give it time to work. It is also worth checking the condition of high-voltage wires or ignition coils, as they often require replacement along with the spark plugs.
⚠️ Attention! Never use a spark plug wrench without an extension and a universal joint for the rear spark plug - you risk damaging the ignition coil or not tightening the spark plug all the way, which will lead to loss of compression and gasket burnout.
The quality of spark plugs directly affects engine performance. If you doubt the originality of a spare part, be sure to check the labeling and packaging. Fake spark plugs may have an incorrect gap, which will lead to unstable engine operation and increased fuel consumption. It's better to spend a little more time checking than to pay for engine repairs later.
Preparing the vehicle and dismantling attachments
Make sure the engine is completely cool before starting work. Running a hot engine can cause burns and, more importantly, damage to the cylinder head threads due to thermal expansion of the metal. Open the hood and secure it with a secure stand. To provide access to spark plugs on the engine MR20DE it is necessary to remove the plastic decorative casing that covers the upper part of the motor. It is usually held on by several latches and screws that are easily removed by hand or with a screwdriver.
After removing the casing, you will see the ignition coils that are attached to the spark plugs. On Nissan Qashqai J11 Each coil has its own connector, which must be carefully disconnected. Press the connector latch and pull it up. Be careful not to damage the plastic coil housing or wiring. After disconnecting the connector, it is necessary to unscrew the bolt securing the coil to the cylinder head. Typically a 10mm wrench bolt is used.
- 🔧 Disconnect the connector from the first ignition coil by pressing the lock
- 🔩 Unscrew the coil mounting bolt and carefully remove it from the well
- 🧹 Blow out the spark plug well with compressed air to prevent debris from getting into the cylinder
- 🔦 Inspect the condition of the coil for cracks or signs of breakdown
The process of dismantling the coils requires care. Sometimes they stick to the candles and can be difficult to remove. In such cases, you can gently rock the coil from side to side, but without fanaticism, so as not to break the plastic case. If the coil does not budge, use a special puller or carefully pry it off with a flat-head screwdriver, placing a cloth to protect the surfaces.
⚠️ Attention! Before unscrewing the spark plugs, be sure to blow out the wells with compressed air. Dust and dirt that gets inside the cylinder when unscrewing an old spark plug can lead to serious damage to the piston group and cylinders.
Once all four coils are removed you will have full access to the spark plugs. Pay attention to the condition of the coil insulators - they should be clean and free of carbon deposits. If the insulators show traces of oil or carbon deposits, this may indicate problems with the seals or a gap between the plug and the coil. In this case, it is recommended to replace the o-rings or the coils themselves.
The process of unscrewing and installing new spark plugs
Now that access to the candles is open, you can begin to unscrew them. Use a spark plug wrench with extension and universal joint to reach the rear spark plug. Insert the key into the well and carefully begin to unscrew the spark plug counterclockwise. The first revolutions may require a little effort, but once the spark plug is removed, the process will be easier. If the spark plug does not budge, do not use excessive force - it is better to pre-treat the connection with a penetrating lubricant.
After unscrewing the old spark plug, carefully inspect its condition. The color of the deposit on the electrode can tell a lot about the condition of the engine. Normal color is light brown or gray. Black soot indicates an over-rich fuel mixture, white soot indicates engine overheating, and oily deposits indicate wear on the piston rings or valve guides. This data will help you identify hidden engine problems.
Before installing a new spark plug, be sure to check the gap between the electrodes. Although modern iridium spark plugs often come with a pre-set gap, checking will not be superfluous. For engine MR20DE the optimal gap is 1.1 mm. If the gap is different, carefully bend the side electrode using a special feeler gauge or gap adjustment tool.
- 📏 Check the gap between the electrodes of the new spark plug (the norm is 1.1 mm)
- 🛢️ Apply a thin layer of copper grease to the spark plug threads for easy future removal
- 🔩 Screw the spark plug in by hand until it stops to avoid thread distortion
- ⚙️ Tighten the spark plug with a torque wrench to 25 Nm
Installing a new spark plug requires special care. First screw it in by hand a few turns to make sure the threads are not stripped. Then use a torque wrench for final tightening. Do not overtighten the spark plug - this may damage the threads in the cylinder head or destroy the ceramic insulator. An under-tightened spark plug, on the contrary, will lead to loss of compression and overheating.
- Original Nissan
- NGK
- Denso
- Budget analogues
☑️ Control during replacement
⚠️ Attention! It is strictly forbidden to use lubricant on the threaded part of the spark plug in large quantities. Excess lubricant can enter the combustion chamber and lead to carbon deposits or even water hammer.
After installing all four spark plugs, return the ignition coils to their place. Make sure they fit snugly in the wells and have no play. Connect the connectors until you hear a characteristic click and tighten the coil mounting bolts. Tighten the bolts to the torque recommended by the manufacturer, usually 10-12 Nm. Do not overtighten the bolts as this may cause the plastic reel body to crack.
Common mistakes and ways to avoid them
Even experienced technicians sometimes make mistakes when replacing spark plugs. One of the most common problems is improperly tightened spark plugs. Over-tightening can damage the cylinder head threads, requiring costly repairs. Insufficient tightening, in turn, will lead to loss of compression and overheating of the spark plug, which may result in its destruction inside the cylinder.
Another common mistake is debris getting into the spark plug well when unscrewing an old spark plug. Even a small grain of sand can cause serious damage to the piston or cylinder. Always use compressed air to clean out the well before installing a new spark plug. If you don't have access to compressed air, use a can of air or gently remove debris with a soft brush.
- ❌ Do not use a hammer to remove old spark plugs
- ❌ Do not ignore checking the gap between the electrodes of a new spark plug
- ❌ Do not install coils without checking their condition
- ❌ Don’t forget about cleaning wells from dust and dirt
It is also worth paying attention to the condition of high-voltage wires or ignition coils. If they have signs of wear, cracks or signs of breakdown, it is better to replace them along with the spark plugs. This will prevent possible problems with sparking and ensure stable engine operation. Do not skimp on the quality of components - this may lead to even greater costs in the future.
What to do if the spark plug breaks while unscrewing?
If a spark plug breaks while unscrewing, do not try to remove the remainder by hand. Use a special candle extractor or contact service. Attempting to remove the remainder by hand may damage the threads in the cylinder head.
Sometimes car owners encounter a problem when a new spark plug does not screw in completely. This may be due to damaged threads or incorrect selection of spark plug size. In such cases, you should not make excessive efforts - it is better to check the compatibility of the spark plug with the engine and, if necessary, seek help from specialists.
Technical characteristics and specifics of the MR20DE engine
Engine MR20DE, installed on Nissan Qashqai J11, has its own characteristics, which are important to consider when replacing spark plugs. The engine capacity is 2.0 liters, power is 141 hp, and the ignition system operates under high voltage. This requires the use of spark plugs with a high resource and stable sparking. Iridium spark plugs are ideal for this engine, ensuring reliable ignition of the fuel mixture even at low temperatures.
Engine design feature MR20DE is the location of the spark plugs: the two front spark plugs are relatively easily accessible, while the two rear spark plugs are in a hard-to-reach place. This requires the use of special tools and patience when replacing them. Improper handling of the rear spark plugs can damage the ignition coils or spark plug wells.
| Parameter | Meaning |
|---|---|
| Engine type | MR20DE (2.0 L, 16 valves) |
| Recommended candle type | Iridium (NGK, Denso, OEM) |
| Tightening torque | 25 Nm |
| Gap between electrodes | 1.1 mm |
| Replacement interval | 60,000 - 100,000 km |
It is important to note that the engine MR20DE sensitive to fuel quality and the condition of the ignition system. Using low-quality spark plugs or installing them incorrectly can lead to misfire, which in turn will cause the catalytic converter to overheat and fail. This can lead to significant financial costs for repairs.
Before starting work, take a photo of the location of the wires and connectors - this will help avoid confusion during assembly.
When replacing spark plugs, it is also worth checking the condition of the crankcase ventilation system. If the system is clogged, this can lead to oil getting into the spark plugs and causing them to wear out quickly. Regularly checking and cleaning the crankcase ventilation system will help extend spark plug life and improve engine performance.
Completion of work and checking the result
After installing all new spark plugs and ignition coils, you must reassemble the engine in reverse order. Install the decorative engine cover, secure all bolts and connectors. Check that all connections are securely fastened and have no play. Start the engine and listen carefully to its operation. The engine should run smoothly, without misfires or extraneous noise.
If any unusual sounds or vibrations occur after starting the engine, stop the engine immediately and check that the spark plugs and coils are installed correctly. Perhaps one of the spark plugs was not screwed in completely or the coil was not seated. In such cases, it is better to double-check all connections rather than continue operating the vehicle with a faulty ignition system.
- ✅ Start the engine and check its idle speed
- ✅ Make sure there are no vibrations or extraneous noises
- ✅ Check for errors on the dashboard
- ✅ Take a test drive to evaluate acceleration dynamics
After successfully checking the engine operation, the replacement of spark plugs can be considered complete. It is recommended to carry out the first check after 1000 km to ensure the stability of the ignition system. If everything is in order, the next replacement of spark plugs will be required only after 60,000 - 100,000 km, depending on operating conditions and fuel quality.
⚠️ Attention! After replacing the spark plugs, be sure to check the engine operation in different modes. Misfires can only appear under load, so a test drive is required.
Regular replacement of spark plugs is the key to long and reliable operation of your engine. Nissan Qashqai J11. By following simple recommendations and using high-quality components, you can perform this procedure yourself and save on car service costs. The main thing is to follow safety precautions and take your time when performing work.
Correctly tightening the spark plugs to 25 Nm and using iridium spark plugs is the key to keeping the MR20DE engine running for long periods of time without misfiring.
Frequently asked questions (FAQ)
What is the spark plug replacement interval for the Nissan Qashqai 2.0 J11?
The manufacturer recommends replacing spark plugs every 60,000 - 100,000 km, depending on the type of spark plugs (nickel or iridium) and operating conditions. The use of iridium spark plugs allows you to increase the interval to 100,000 km.
Is it possible to replace spark plugs without removing the coils?
No, on the engine MR20DE The ignition coils are mounted directly on the spark plugs, so they must be removed to access the spark plugs. Attempting to remove the spark plug without removing the coil will damage the coil or spark plug well.
What to do if the spark plug is stuck and won’t come out?
Do not use excessive force. Treat the joint with penetrating lubricant, give it time to work, and then try to carefully unscrew the spark plug. If the spark plug still does not budge, contact a specialist to avoid damaging the threads in the cylinder head.
What is the tightening torque for spark plugs on Nissan Qashqai 2.0?
Recommended tightening torque for engine spark plugs MR20DE is 25 Nm. Use a torque wrench for precise tightening to avoid damaging the threads or ceramic plug insulator.
Is it possible to use regular nickel spark plugs instead of iridium spark plugs?
Technically possible, but not recommended. Nickel spark plugs have a shorter lifespan (about 20,000 - 30,000 km) and can lead to unstable engine operation. Iridium spark plugs provide more stable sparking and last up to 100,000 km.