Replacing spark plugs on a Nissan Teana J32 2.5: a guide with photos and nuances

Nissan Teana J32 with motor QR25DE The 2.5 liter sedan is a reliable sedan, but even its spark plugs wear out over time. If you notice failures during acceleration, increased fuel consumption or difficult engine starting - it's time to replace them. In this article we will look at how to do it yourself, without contacting a service, saving up to 5,000 rubles (average cost of work in car repair shops in Moscow).

The procedure does not require special skills, but there are nuances: from choosing the right candles to the moment of tightening, which many miss. We have collected step-by-step instructions with photos, a comparison table of original and analog spark plugs, as well as answers to frequently asked questions. If you have never opened the hood, don’t worry: with our help you can do it in 1.5–2 hours.

When to change spark plugs on Nissan Teana J32 2.5?

The manufacturer recommends replacement every 100,000 km mileage or once every 6–7 years (whichever comes first). However, the actual service life depends on several factors:

• 🔥 Fuel quality: Low-octane gasoline accelerates wear of the electrodes.
• 🚗 Riding style: Frequent short trips and cold starts reduce the resource.
• 🌡️ Engine overheating: If the engine often runs at high temperatures, the spark plugs “burn out” faster.
• 🔧 Ignition system condition: Faulty coils or wires will reduce service life.

There are also indirect signsthat it’s time to change the spark plugs:

• ⚡ The engine “troits” (vibration at idle).
• 🛢️ Fuel consumption increased by 10–15% without objective reasons.
• 🚦 Dips when pressing the gas sharply (especially noticeable on the highway).
• 🔊 Popping noise in the exhaust system when starting up.

⚠️ Attention: If detected on candles oil deposits or reddish soot (a sign of ferrocene additives in gasoline), the problem may be deeper - wear of the rings or valves. In this case, replacing candles only temporarily masks the symptoms.

Which spark plugs are suitable for Nissan Teana J32 2.5?

For engine QR25DE suitable candles with heat number 6 And gap 1.1 mm. Original articles from Nissan:

Manufacturer	Article	Type	Average price (pieces)	Features
Nissan	22401-JK00A	Original (NGK)	800–1 200 ₽	Iridium, resource up to 120,000 km
NGK	IFR6A11	Analogue (iridium)	600–900 ₽	Complete analogue of the original, often installed from the factory
Denso	IK16	Iridium	550–850 ₽	Good alternative to NGK, soft start in winter
Bosch	FR7DPX	Platinum	400–600 ₽	Budget option, resource up to 80,000 km
Champion	OE201/T10	Nickel	200–350 ₽	Minimum resource, suitable for temporary replacement

We recommend iridium spark plugs - they are more expensive, but they pay for themselves due to fuel economy (up to 3–5%) and stable engine operation. If your budget is limited, take it Denso IK16 or NGK IFR6A11 - this is the optimal ratio of price and quality.

⚠️ Attention: Don't buy candles from gap greater than 1.1 mm - this will lead to misfires. Also avoid cheap "no-name" brands: they often have an unstable heat rating, which can lead to detonation and damage to the pistons.

What is the difference between iridium spark plugs and platinum spark plugs?

Iridium spark plugs have a central electrode made of iridium alloy (a refractory metal), which provides thinner electrode (0.4–0.6 mm versus 0.7–1.0 mm for platinum) and more stable spark. Platinum ones are cheaper, but their resource is 20–30% less. For QR25DE Iridium is preferable, since the engine is sensitive to the quality of the spark, especially at high speeds.

Preparing for replacement: tools and safety precautions

To work you will need:

• 🔧 Candle key 16 mm with a rubber bushing (so as not to damage the insulator).
• 🔩 Extension cord for the key (minimum 10 cm) and ratchet.
• 🧲 Magnetic grip or tweezers for removing candles from wells.
• 🧴 Dielectric grease (For example, Liqui Moly Keramik-Spray).
• 🧹 Compressor or can of compressed air for cleaning wells.
• 🔦 Flashlight — lighting in the engine compartment Teana J32 leaves much to be desired.

Also prepare the car:

1. Allow the engine to cool (working on a hot engine is dangerous - there is a risk of getting burned and stripping the threads).
2. Disable negative battery terminal (this will prevent a short circuit if the coils accidentally touch).
3. Clear the area around the spark plug wells of dirt (debris getting into the cylinders can lead to bullies).

The battery terminal is disconnected|The engine has cooled down (temperature no higher than 40°C)|The tool has been checked for serviceability|The spark plug wells have been cleared of dirt|New spark plugs have been unpacked and checked for defects

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Important: Do not use WD-40 or other penetrating lubricants to make it easier to unscrew the spark plugs! They can enter the combustion chamber and cause detonation at startup. If the candle is stuck, use special puller or contact service.

Step-by-step instructions for replacing spark plugs

On Nissan Teana J32 access to the candles is difficult - you will have to remove them intake manifold or work “blindly” through narrow wells. We will describe method without removing the manifold, which is suitable for beginners.

Step 1. Removing the ignition coils

Each candle is covered with an individual coil. To remove it:

1. Disconnect power connector (press the lock and pull up).
2. Unscrew fastening bolt coils with a 10 mm wrench.
3. Carefully remove the coil by rocking it from side to side (do not pull on the wire!).

Step 2. Removing old spark plugs

Insert the spark plug key into the well and carefully screw it onto the candle. If you feel resistance:

• Do not use force - you risk breaking the thread.
• Try turning the key in the opposite direction 1/8 of a turn, then back to the unscrewing side.
• If it doesn't help, use it remover for stuck spark plugs.

Step 3. Installing new spark plugs

Before installation:

• Check gap feeler gauge (must be 1.0–1.1 mm).
• Apply a thin layer dielectric grease onto the thread (this will prevent sticking).
• Make sure there are no cracks or chips in the insulator on the spark plug.

Twist the candles manually until it stops, then tighten the key with a torque 20–25 Nm (Tightening leads to damage to the threads in the block head!).

Step 4. Assembly

Reinstall the coils in reverse order, making sure that:

• Power connectors securely fixed (a click should be heard).
• Coil mounting bolts tightened with a torque of 8–10 Nm.

Common mistakes and how to avoid them

Even experienced car owners sometimes make mistakes. Here are the most critical ones:

1. Re-upholstery of candles - leads to cracks in the block head or thread breakage. Always use torque wrench.
2. Rubbish getting into wells - even fine dirt can cause cylinder scuffing. Blow out wells with compressed air before removing old candles.
3. Using incompatible candles - for example, with a heat rating of 5 instead of 6. This will lead to detonation or misfires.
4. Incorrect clearance - too large a gap impairs sparking, too small - leads to “flooding” of the spark plugs.
5. Ignoring the state of the coils - if there are cracks or signs of breakdown on the coil, it needs to be replaced to installing new spark plugs.

Another typical problem is insulator break when removing the spark plug. This happens if:

• The candle has not been changed for a long time and has become “stuck”.
• Excessive force or the wrong tool is used.

If the insulator remains in the well, do not try to remove it with a magnet - contact service. Ceramic fragments can damage the piston!

Checking operation after replacement

After installing new spark plugs:

1. Connect the battery and start the engine. It should start right the first time no failures.
2. Listen to the engine at idle speed - there should be no vibrations or extraneous sounds.
3. Check throttle response: press the gas sharply - if there are no failures, the replacement was successful.
4. After 10–15 minutes of operation, check coil temperature - they should not be hot (a sign of breakdown).

If the engine "troubles" or catches fire check engine, possible reasons:

• 🔌 Coils are not connected correctly (check the connectors).
• 🔥 Insulation breakdown (inspect the spark plugs for black streaks).
• 🛠️ Thread damage (needs compression diagnostics).

For accurate diagnostics, connect OBD-II scanner (For example, ELM327) and check the error codes. Frequent codes after an unsuccessful replacement:

• P0300 — random misfires;
• P0301–P0306 - misfires in a specific cylinder;
• P0351–P0356 - ignition coil malfunction.

Cost of replacement in the service vs on your own

Prices for replacing spark plugs in car service centers in Moscow and the regions (as of May 2026):

Service type	Cost of work (per 1 candle)	Cost of work (set)	Opening hours
Official dealer Nissan	800–1 200 ₽	4 800–7 200 ₽	1.5–2 hours
Network car service (for example, Bosch Service)	500–800 ₽	3 000–4 800 ₽	1–1.5 hours
Local service ("garage")	300–500 ₽	1 800–3 000 ₽	40–60 minutes
Self-replacement	0 ₽	0 ₽ (only the cost of candles)	1.5–3 hours

By saving on work, you can spend money on quality candles (for example, iridium NGK IFR6A11 instead of budget ones Champion). Also, self-replacement gives you experience and understanding of the condition of the engine - you will be able to notice other problems in time (for example, oil drips on reels or cracks in the manifold).

Important: If you are not confident in your abilities, it is better to entrust the work to professionals. Errors when replacing spark plugs can result in cylinder head repair, which will cost 50 000–100 000 ₽.

FAQ: Frequently asked questions about replacing spark plugs on a Nissan Teana J32

Is it possible to replace spark plugs without removing the intake manifold?

Yes, but it's more complicated. You will have to work “blindly” through narrow wells, using an extension cord and a magnetic grip. If you have big hands or no experience, it is better to remove the manifold (you will need to unscrew 6 bolts and disconnect the pipes).

What happens if you don’t change spark plugs for more than 100,000 km?

The consequences depend on the condition of the candles:

• 🔥 Increased clearance between the electrodes leads to misfires and catalyst overheating.
• 🛢️ Carbon deposits on the electrodes impairs sparking, which increases fuel consumption by 10–15%.
• 💥 Destruction of the insulator may cause detonation and damage to the pistons.

In critical cases it will be necessary to repair catalytic converter or cylinder head.

Which spark plugs are better - NGK or Denso?

Both brands supply candles to the assembly line Nissan, so the difference is minimal:

• NGK IFR6A11 — sparking is a little better at high speeds.
• Denso IK16 — runs smoother at idle and is more resistant to soot.

For Teana J32 better with automatic transmission Denso (smoother idle), for mechanics - NGK (best response when revving).

Do I need to lubricate the spark plug threads?

Yes, but only with dielectric grease (For example, Liqui Moly Keramik-Spray). This prevents:

• Sticking of spark plugs to the block head.
• Thread corrosion.
• Difficulty unscrewing the next time it is replaced.

Do not use Litol, graphite lubricant or WD-40 - they can cause spark breakdown or detonation.

Is it possible to drive with a faulty ignition coil?

Short term - yes, but this leads to:

• 🔥 Catalyst overload (unburned fuel burns out in the outlet).
• 🛢️ Increased fuel consumption (up to 20%).
• 💥 Risk of damage to the computer due to a broken circuit.

If the coil is broken, replace it within 1–2 weeks. The cost of the original coil for QR25DE - about 3 000 ₽.