<em>Nissan Almera N16</em> spark plugs: how to select and replace without errors

Nissan Almera N16 (2000–2006) - popular sedan with gasoline engines QG15DE (1.5 l) and QG18DE (1.8 l), which are demanding on the quality of spark plugs. Wrong choice or untimely replacement leads to misfires, increased fuel consumption and even damage to the catalyst. In this article we will look at which candles are suitable for Almera N16, how to replace them correctly and what to look for when purchasing.

Original candles from Nissan are expensive, but the market offers dozens of analogues - from budget Beru up to bonus NGK And Denso. We analyzed the technical characteristics, reviews of owners and recommendations of service centers to create a checklist of the best options. You will also learn how to recognize the wear of spark plugs by symptoms and why you cannot ignore the replacement regulations - on Almera N16 with a mileage of over 100 thousand km, worn spark plugs accelerate the destruction of the catalytic converter by 2–3 times.

Original candles for Nissan Almera N16: articles and characteristics

The manufacturer sets the Almera N16 candles with heat number 6 and gap 1.0–1.1 mm. Original parts are supplied by the company NGK under the brand Nissan. Main articles:

• 🔧 22401-4M000 — original catalog number for engines QG15DE/QG18DE (analogue NGK BCP6ES-11).
• 🔧 22401-4M015 — option with a platinum central electrode (analogue NGK BCP6EP-11).
• 🔧 22401-JD00A — for markets with low fuel quality (extended resource).

The original candles serve 30–40 thousand km (standard) and up 60–80 thousand km (platinum). However, their high price (from 800 rubles per piece) forces owners to look for alternatives. Important: even original spark plugs require checking the gap before installation - on Almera N16 with gas-cylinder equipment (GBO) it is increased to 1.2–1.3 mm.

Analogues of original candles: what to choose?

Analogs are 30–50% cheaper, but not all meet the requirements Nissan. We have selected proven options taking into account owner reviews and bench tests:

Brand	Article	Electrode type	Resource (thousand km)	Average price (pieces)
NGK	BCP6ES-11	Nickel	30–40	350–450 ₽
Denso	W20EPR-U11	Platinum	50–60	500–650 ₽
Beru	14FR-7DU	Nickel	25–35	200–300 ₽
Bosch	FR7DCX	Copper	20–30	250–350 ₽

🔹 Best budget option: Beru 14FR-7DU - cheap, but require replacement every 25 thousand km. Suitable for temporary use.

🔹 Optimal price/quality ratio: NGK BCP6ES-11 — original analogue, works stably on AI-92/95 gasoline.

🔹 For long service: Denso W20EPR-U11 with platinum coating - resource up to 60 thousand km, but sensitive to fuel quality.

⚠️ Attention: Candles Bosch FR7DCX often counterfeited. Signs of a fake are the absence of a logo on the packaging and too light weight (the original weighs ~45 g).

Signs of faulty spark plugs

On Almera N16 Worn spark plugs are not only caused by difficult starting. Pay attention to these symptoms:

• ⚡ Misfires at idle (the engine “troits”, vibration on the steering wheel).
• 🛢️ Increased fuel consumption (more than 10–12 l/100 km in the city).
• 🔥 Detonation when accelerating (noisy metallic knocks).
• 💨 Black or white soot on the electrodes (checked after unscrewing).
• 🚗 Power drop (the car pulls poorly when overtaking).

🔧 Diagnostics by soot:

• 🖤 Black oily soot — oil getting into the combustion chamber (wear of valve stem seals).
• ⚪ White coating - spark plug overheating or lean fuel mixture.
• 🟠 Red plaque - low-quality fuel with additives.

If detected on candles electrode erosion (sharp edges), they need to be replaced urgently - this leads to an increase in the gap and missed sparks. On Almera N16 with mileage >150 thousand km, it is recommended to check the spark plugs every 15 thousand km, even if they are “platinum”.

Step-by-step replacement of spark plugs Nissan Almera N16

To replace you will need:

• 🔧 Candle key on 16 mm with extension cord.
• 🔧 Socket wrench on 10 mm (for removing coils).li>
• 🧴Dielectric grease (e.g. Liqui Moly).
• 🧲 Magnetic “fishing rod” (so as not to drop the candle into the well).

🔧 Work order:

1. Disconnect the negative terminal of the battery.
2. Remove the plastic engine cover (4 clips).
3. Disconnect the ignition coil connectors and unscrew the mounting bolts (the key is on 10 mm).
4. Remove the coils (carefully, without jerking!).
5. Unscrew the old spark plugs with a spark plug wrench. Attention: if the spark plug is stuck, do not apply force - treat the thread with penetrating lubricant (WD-40) and wait 10 minutes.
6. Check the gap of the new spark plugs with a feeler gauge (should be 1.0–1.1 mm).
7. Install new spark plugs by screwing them in by hand until it stops, then tighten the key with a torque 20–25 Nm.
8. Reassemble everything in reverse order.

Check new spark plug gap|Disconnect battery|Use dielectric grease on coil contacts|Do not over-torque|Check for debris in spark plug wells-->

⚠️ Attention: On Almera N16 with engine QG18DE spark plug wells are deeper than QG15DE. If you drop a spark plug or debris into the well, you will need to remove the intake manifold!

Common mistakes when replacing spark plugs

Even experienced car owners make mistakes that lead to breakdowns. That's what can't do:

• 🔧 Screw in spark plugs without a feeler gauge - incorrect clearance (0.8 mm or 1.3+ mm) leads to misfires.
• 🔧 Use extension cords without a magnet - the spark plug may fall into the well and will have to be removed by removing the collector.
• 🔧 Drag candles - thread in the aluminum block head QG18DE breaks easily. Maximum torque - 25 Nm!
• 🔧 Ignore Dielectric Grease — without it, the coil contacts oxidize in 1–2 years.

🔹 Consequences of incorrect replacement:

• 💥 Candle breakage in a well - requires drilling and cutting a new thread (repair cost ~10 thousand rubles).
• ⚡ Ignition coil breakdown — if the contacts are not lubricated, moisture causes corrosion.
• 🔥 Engine overheating — spark plugs that are too “hot” (with a low heat rating) provoke detonation.

What to do if a candle breaks off in a well?

If part of the spark plug breaks off, do not try to unscrew it yourself - contact service. Craftsmen use a special extractor or drill out the remains, then cut a new thread with a repair size (for example, M14×1.25 instead of standard M12×1.25).

Candles for Almera N16 with HBO: features of choice

On cars with gas-cylinder equipment, spark plugs operate under more severe conditions: the combustion temperature of gas is higher than that of gasoline, and the spark must be more powerful. Recommendations:

• 🔥 Heat number - 1–2 units “colder” (for example, NGK BCP7ES instead of BCP6ES).
• ⚡ Gap - increase to 1.2–1.3 mm for reliable ignition of the gas-air mixture.
• 💎 Electrode material — iridium or platinum spark plugs are preferred (Denso IW20, NGK IFR6A11).

🔹 The best options for HBO:

Brand	Article	Type	Resource (thousand km)
NGK	IFR6A11	Iridium	80–100
Denso	IW20	Iridium	90–110
Beru	14FGR-7DU	Platinum	50–60

⚠️ Attention: On gas standard nickel spark plugs (NGK BCP6ES) serve 2-3 times less - their service life is reduced to 10-15 thousand km.

Answers to frequently asked questions

❓ Is it possible to put candles with a different glow number?

No! On Almera N16 the heat number should be 6 (for gasoline) or 7 (for HBO). “Hot” spark plugs (number 5 and below) cause detonation, “cold” spark plugs (8+) lead to carbon deposits and misfires.

❓ How often to change spark plugs Almera N16?

Depends on type:

• 🔹 Standard (nickel) - every 30 thousand km.
• 🔹 Platinum/iridium — every 60–80 thousand km.
• 🔹 When using HBO - reduce the interval by 30%.

❓ Why does the engine stall after replacing the spark plugs?

Possible reasons:

• 🔧 Incorrect gap (check with a feeler gauge).
• 🔧 Damaged ignition coil (check resistance with a multimeter).
• 🔧 Debris getting into the candle well.
• 🔧 Poor quality candles (especially often counterfeited Bosch And NGK).

Reset the ECU errors and check the fault codes with a scanner.

❓ Which spark plugs are better for saving fuel?

Iridium spark plugs (Denso IW20, NGK IFR6A11) reduce fuel consumption by 3–5% due to a stable spark. However, their effect is noticeable only if the fuel system is working properly.

❓ Is it possible to clean candles with sandpaper?

No! Mechanical cleaning damages the protective coating of the electrodes and reduces the service life. To clean use:

• 🧹 Ultrasonic bath (in service).
• 🧴 Special cleaner (Liqui Moly Ventil Sauber).
• 🔥 Calcination on a gas burner (only for nickel candles!).