Replacing spark plugs on a Nissan Almera Classic: instructions with photos and tips

Replacing spark plugs with Nissan Almera Classic - a procedure that many car owners prefer to do on their own. And for good reason: with the right approach, it takes no more than an hour, saving up to 3,000 rubles at a service station. But there are nuances that are not written about in standard manuals. For example, why on the engine GA16DE (1.6 l) candles “stick” more often than at QG18DE (1.8 l), or how to avoid damage to ignition coils during dismantling.

This article contains step-by-step instructions with photos, selection of original and analog candles, as well as analysis of typical errors, due to which, after replacement, misfires or Check Engine. We took into account the specifics Almera Classic (body B10, 2006–2012), including differences between engines with a camshaft SOHC And DOHC. If you have never worked with the ignition system, don’t worry: there is nothing more difficult than unscrewing 4 bolts and not mixing up the wires.

Which spark plugs are suitable for Nissan Almera Classic

Original candles for Almera Classic supplies NGK — their article numbers depend on engine size and year of manufacture. For motors 1.6 (GA16DE) fit NGK PLZKAR6A-11 (catalog number 22401-4M515), and for 1.8 (QG18DE) — NGK IFR6A11 (22401-3J600). These same spark plugs were installed at the factory in Japan And Korea.

Among the analogues tested:

• 🔧 Denso IK16 or IK20 (for 1.6 and 1.8, respectively) - resource up to 30,000 km, but are sensitive to fuel.
• 🔧 Bosch FR7DPX or FR8DPX is a budget option, but may require replacement after 20,000 km.
• 🔧 Brisk DR15YC or DR17YC - a good balance between price and quality, often recommended by craftsmen.

Important: on Almera Classic with HBO spark plugs wear out faster. It's better to use here iridium (For example, NGK IFR6T11 or Denso Iridium Power IK20), despite their high price - they last up to 60,000 km and reduce the risk of detonation.

Tools and materials for replacement

You will need:

• 🔧 Candle key on 16 mm with a magnetic tip (required! a regular key will not work).
• 🔧 Socket wrench on 10 mm - for removing ignition coils.
• 🔧 Torque wrench (optional, but recommended for precise tightening).
• 🔧 A screwdriver with a flat blade - for prying off the fasteners of wire harnesses.
• 🔧 A compressor or compressed air cylinder - to clean dust from wells.
• 🔧 Dielectric grease (For example, Liqui Moly Silicone-Fett) - for processing coil tips.

If you have an engine QG18DE (1.8 l), prepare additionally extension for key — the candles here are recessed deeper, and it’s difficult to get to them without it. For GA16DE (1.6 l) An extension cord is not needed, but it will come in handy flexible hose for blowing out wells.

Step-by-step instructions: how to change spark plugs

The replacement process is the same for both engines (1.6 And 1.8), but there are differences in access to candles. Let's start with the preparatory stage:

1. Disconnect the battery. Remove the negative terminal - this will prevent a short circuit when working with the coils.
2. Remove the decorative engine cover. On 1.6 it is attached to 4 plastic clips, on 1.8 - 2 bolts turnkey 10 mm.
3. Clean the area around the candles. Use a compressor or brush to remove dust and dirt. Debris getting into the cylinders is the main cause of damage to the pistons after replacing spark plugs..

Now let's move on to dismantling the ignition coils:

Disconnect the power connector from the coil (press the latch and pull up)|

Unscrew the coil mounting bolt with a 10 mm wrench |

Carefully remove the coil by rocking it from side to side (do not pull on the wire!)|

Label the coils so as not to mix them up when reinstalling them -->

To remove candles:

1. Insert the spark plug key into the well and carefully put it on the candle. If the candle is “stuck”, do not make any effort - treat it first WD-40 and wait 10 minutes.
2. Unscrew the spark plug counterclockwise. On QG18DE An extension cord may be required.
3. Inspect the spark plug: if there is oil or carbon on it, this is a signal of problems with the engine (for more details, see the section “Diagnostics based on the condition of spark plugs”).

Installing new spark plugs:

• 🔧 Screw in the candles manually all the way, then tighten with a torque wrench 20–25 Nm. Without a dynamometer - tighten 1/4 turn beyond the "stop".
• 🔧 Apply dielectric grease onto the coil tip before installation.
• 🔧 Make sure that the power connectors of the coils are connected tightly (the click of the latch should be heard).

Common mistakes and how to avoid them

Even experienced car owners make mistakes when replacing spark plugs. Almera Classic. Here are the most critical ones:

⚠️ Attention: Never use molybdenum grease on candle threads! It conducts current and can cause breakdown of the insulator. Allowed only copper paste (For example, Liqui Moly Kupfer-Paste).

Error 1: Re-stretching spark plugs. This leads to damage to the threads in the cylinder head. On Almera Classic aluminum cylinder head, and its repair will cost 15,000–20,000 rubles. The overtightening signal is difficulty screwing in or a cracking sound when tightening.

Error 2: Installing spark plugs without clearance. On NGK And Denso the gap is set by the factory (1.0–1.1 mm), but if you are using budget alternatives, check it out feeler gauge. Incorrect clearance leads to misfire and error. P0300.

Mistake 3: Confusion with coil wires. On GA16DE coils are interchangeable, but QG18DE they are numbered (see table below). If you mix it up, the engine will trip.

Cylinder number	Coil Position (QG18DE)	Connector color (GA16DE)
1	Closer to the radiator, on the right	Black
2	Closer to the radiator, on the left	Gray
3	Closer to the salon, on the right	White
4	Closer to the salon, on the left	Brown

Engine diagnostics based on spark plug condition

Spark plugs are an indicator of engine health. After removal, inspect them:

• 🔥 Normal Wear: Light gray-brown coating, electrodes are intact. This means the engine is working correctly.
• 🛢️ Thread oil: Signal about leakage of valve stem seals or rings. On Almera Classic This is a common problem after 150,000 km.
• ⚡ Black dry carbon: Rich fuel mixture. Reasons: faulty Mass air flow sensor, clogged injectors or problems with lambda probe.
• 💥 Melted electrodes: Detonation due to low octane fuel or pre-ignition. On QG18DE may lead to valve burnout.

If by candlelight red plaque - Gasoline contains a lot of metal additives (for example, ferrocene). This destroys the catalyst. Solution: change gas station and flush the fuel system.

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

If the spark plug breaks while unscrewing it, don't panic. Carefully remove the fragments magnetic extractor (sold in auto stores). If the threads are damaged, you will need screwdriver (repair sleeve). On Almera Classic it will cost 5,000–8,000 rubles at the service station.

Replacement frequency and signs of spark plug wear

Official regulations Nissan instructs to change spark plugs every 30,000 km (or once every 2 years). However, in practice, the period depends on the operating conditions:

• 🚗 City mode: Replace every 25,000–30,000 km due to frequent cold starts.
• 🛣️ Route: The spark plugs last up to 40,000 km due to their stable speed.
• ⛽ Gas equipment: The resource is reduced to 20,000 km due to the higher combustion temperature.

Signs of spark plug wear:

• 🔧 The engine is running at idle speed.
• 🔧 Fuel consumption has increased (more 10–12 l/100 km in the city).
• 🔧Caught on fire Check Engine with errors P0300–P0304 (misfire).
• 🔧 Difficulty starting the engine, especially in cold weather.

⚠️ Attention: If after replacing the spark plugs the engine continues to stall, check ignition module (a common problem on Almera Classic after 200,000 km). His resistance should be 5–10 kOhm (measured with a multimeter).

Replacement cost: do it yourself vs service station

The price difference is significant:

Service	Cost (RUB)	Notes
Self-replacement	800–2 500	Price of spark plugs (original or analogues) + tools (if not available).
Replacement at service station	2 000–4 500	Includes work (RUB 1,200–2,000) and candles (RUB 800–2,500).
Diagnostics + replacement	3 500–6 000	If a coil or compression check is required.

Savings when replacing yourself - up to 2,000 rubles. But if you don't have a torque wrench or experience with... DOHC-engines (as on QG18DE), it is better to trust the professionals. Errors during replacement can result in cylinder head repairs costing 20,000+ rubles.

FAQ: Frequently asked questions about replacing spark plugs

Is it possible to change spark plugs one at a time if the others are in good condition?

No, this is not recommended. Even if the spark plugs visually look normal, their wear and resistance are different. Replacing the kit ensures uniform operation of all cylinders. An exception is if one spark plug fails less than 5,000 km after replacement (defect or mechanical damage).

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

First check:

1. The coils are connected correctly (see the table in the "Errors" section).
2. Tightening the spark plugs (too tight or too tight).
3. Condition of new spark plugs (possible factory defect).

If the error does not disappear, read its code with a scanner (for example, ELM327). Frequent codes after replacement: P0300 (misfires), P0351–P0354 (coil malfunction).

Do I need to lubricate the spark plug threads before installation?

Yes, but only copper paste or special lubricant for spark plugs (for example, NGK CB6). This prevents sticking and makes future replacement easier. Do not use graphite or lithium grease - they do not withstand high temperatures.

Which spark plugs are best for Almera Classic with HBO?

The optimal choice is iridium spark plugs with reduced clearance (0.7–0.8 mm instead of standard 1.0–1.1 mm). Suitable models:

• NGK IFR6T11 (gap 0.8 mm).
• Denso Iridium Power IK20 (gap 0.7 mm).
• Brisk DR17YC-1 (budget option, gap 0.8 mm).

Iridium spark plugs last up to 60,000 km on gas and reduce the risk of backfiring.

Can I use spark plugs from other Nissan models?

Yes, but with reservations. Candles from Nissan Primera (P12) or Nissan Sunny (N16) with the same engine (QG18DE or GA16DE) will fit. However, avoid candles from Nissan Juke or Qashqai — they are designed for other operating conditions (turbocharging, direct injection). Always check the catalog for the VIN.