Cleaning the throttle body of the <em>Nissan Almera Classic B10</em>: a complete guide with photos and nuances

Throttle valve Nissan Almera Classic B10 (2006–2012) - one of the key components of the injection system, which over time becomes covered with soot, oil deposits and dust. Pollution leads to unstable engine operation, increased fuel consumption and even errors. P0100 or P0507 on the dashboard. Unlike modern electronically controlled cars, mechanical damper in Almera B10 requires a special approach when cleaning - you can’t just pour in the cleaner and forget about it.

In this article you will find step-by-step instructions with photos, analysis of typical errors (including those that lead to a break in the throttle cable), as well as unique recommendations for adapting the damper after cleaning - without this, the engine may run unstably for the first 50–100 km. We tested 5 popular cleaners and found which one works best on carbon deposits on aluminum surfaces Almera Classic. If your car jerks at idle, reacts poorly to the gas pedal, or stalls when changing gears, this article is for you.

Signs of a dirty throttle body Nissan Almera B10

The first symptoms appear gradually, and many owners attribute them to “age-related problems” with the engine. QG15DE or QG18DE. However, if you notice at least 3 of these signs, the damper definitely needs cleaning:

• 🔥 Floating idle speed (the tachometer needle jumps in the range of 600–1200 rpm). Especially noticeable when turning on the air conditioning or headlights.
• 🚗 Jerks during acceleration at speeds of 20–40 km/h, as if the engine is “choking.” Often accompanied by a check light Check Engine.
• 💨 Burnt smell from air ducts - a sign that oil and fuel are burning directly in the throttle assembly.
• 🛑 Engine stalls when releasing gas (for example, when braking or shifting to neutral).
• ⚡ Increased fuel consumption by 1–2 liters in the city for no apparent reason.

B Almera Classic B10 the damper gets dirty faster than in new models due to the design features of the crankcase ventilation system. Oil vapors through the pipe PCV fall directly into the throttle assembly and settle on the walls. If you drive mostly short distances (up to 5 km) or often get stuck in traffic jams, you will have to do cleaning every 20–30 thousand km.

⚠️ Attention: If after cleaning the damper the speed remains unstable, check Throttle Position Sensor (TPS). B Almera B10 it often fails due to cleaner getting on the contacts. Symptom - the speed “freezes” at 1500–2000 rpm and does not fall.

What tools and supplies will be needed

You don’t need specialized tools for the job—what you have in the garage is enough. The main thing is to choose the right one cleaner. We tested 5 popular products and assessed their effectiveness:

Means	Efficiency against carbon deposits	Safety for plastic/rubber	Price (for 400 ml)	Notes
LIQUI MOLY Pro-Line Drosselklappen-Reiniger	⭐⭐⭐⭐⭐	⭐⭐⭐⭐	~600 rub.	Best choice for Almera B10. Does not leave streaks and evaporates quickly.
Wynn's Air Intake System Cleaner	⭐⭐⭐⭐	⭐⭐⭐⭐⭐	~500 rub.	Less aggressive, suitable for regular cleaning.
Hi-Gear Throttle Body Cleaner	⭐⭐⭐	⭐⭐⭐	~350 rub.	Leaves a white residue and requires rinsing with water.
ABRO Carb & Choke Cleaner	⭐⭐⭐⭐	⭐⭐	~250 rub.	Aggressive to rubber seals. Use carefully!
Carburetor cleaner "Lavr"	⭐⭐	⭐⭐⭐	~150 rub.	Doesn't cope well with old carbon deposits. For prevention only.

In addition to the cleaner, prepare:

• 🔧 Screwdrivers: cross (PH2) and flat (for removing clamps).
• 🧤 Nitrile gloves - Cleaners corrode the skin.
• 🧻 Lint-free wipes or microfiber (leaves no fibers).
• 🔌 Wired brush with soft bristles (not metal!).
• 🔋 Multimeter (to check the TPS sensor after cleaning).

Step-by-step instructions for cleaning the throttle body

B Nissan Almera Classic B10 The throttle assembly is located to the right of the engine (when viewed in the direction of travel). Access to it is blocked air pipe And air filter housing. On engines QG18DE will have to be removed additionally canister valveso as not to damage it.

Disconnect the negative terminal of the battery|Remove the air filter housing (4 bolts)|Disconnect the crankcase ventilation pipe|Disconnect the TPS sensor connector|Take a photo of the location of the throttle cable-->

Step 1. Removing the throttle assembly

Unscrew the 4 bolts securing the assembly (using a Phillips screwdriver) and carefully remove it without damaging it gasket. B Almera B10 it often sticks to the intake manifold - do not pull with force, otherwise you will tear it. If the gasket is damaged, replace it with a new one (part no. Nissan 16533-4M000).

Step 2: Clean external surfaces

Apply the cleaner to the outer walls of the unit and remove dirt with a napkin. Do not use metal brushes - they scratch aluminum, and new carbon deposits accumulate faster in microcracks. Pay special attention to:

• 🌀 Damper (it may be covered with a black sticky coating).
• 🕳️ Bypass channel (small hole at the bottom - people often forget to clean it).
• 🔗 Damper axes - if it jams, the engine will stall.

Step 3. Cleaning the internal channels

Turn the assembly over and generously spray the interior surfaces with cleaner. B Almera B10 gets especially dirty idle channel (thin tube on the right). To clean it:

1. Insert the tube from the cleaner kit into the channel.
2. Apply the product in short bursts (3-4 seconds).
3. Blow with compressed air (such as a tire compressor) until the dirt is completely removed.

Step 4: Checking the TPS Sensor

After cleaning necessarily Check the throttle position sensor. Connect the multimeter in resistance measurement mode to the contacts 1–2 (mass) and 2–3 (signal). When the damper opens smoothly, the resistance should change no jumps from 0.5 to 4.5 kOhm. If the device shows a break or short circuit, the sensor needs to be replaced (article no. Nissan 22680-4M000).

⚠️ Attention: Never lubricate the valve shaft WD-40 or other universal lubricants! They attract dust and accelerate re-contamination. Use only special silicone grease (For example, CRC 5-56).

Throttle valve training after cleaning

This is the most important step that 80% of owners skip. Almera Classic B10! After cleaning, the ECU “does not know” the new throttle position, and the engine will run unstably. The training procedure takes 5 minutes and requires precise steps:

1. Make surethat the engine temperature is not lower than 70°C (operating temperature).
2. Turn off the ignition for 10 seconds.
3. Turn on the ignition (without starting the engine) and wait 3 seconds.
4. Within 5 seconds Fully press and release the gas pedal 5 times (all the way!).
5. Wait 7 seconds, then press the gas pedal all the way down and hold it for 20 seconds until the light comes on Check Engine.
6. Release the pedal and turn off the ignition for 10 seconds.
7. Start the engine and let it idle for 2-3 minutes.

If after training the speed is still floating, repeat the procedure. In rare cases it may be necessary reset adaptations via a diagnostic scanner (for example, ELM327 with the program Nissan DataScan).

Common mistakes and how to avoid them

Even experienced car owners make mistakes that lead to breakdowns. Here are the most common:

• 🔧 Using stiff brushes - scratches the surface, and the new carbon deposits come off worse. Use only plastic scrapers or soft brushes.
• 💦 Cleaner contact with TPS sensor — leads to oxidation of contacts. Before cleaning, remove the connector or cover the sensor with tape.
• 🔗 Tightening the mounting bolts - in Almera B10 The thread in the manifold is soft and breaks easily. Tightening torque: 10–12 Nm.
• 🚫 Forgetting to clean the PCV valve - if it is clogged, oil will continue to enter the throttle. The valve is located in the valve box cover (part number Nissan 11810-4M000).
• ⚡ They don't check the throttle cable — after cleaning, it may jam due to dirt. Lubricate it silicone grease.

Another common problem is broken membrane in the vacuum brake booster. Its pipe goes directly to the throttle body, and if the membrane is torn, brake fluid enters the valve through it. Signs: white smoke from the exhaust pipe and a sweetish smell. Check the amplifier if after cleaning the problem returns after 1-2 weeks.

What should I do if the engine does not start after cleaning the throttle body?

If the engine does not start after assembly, check:

1. **Connecting the TPS connector** - if it is not connected, the ECU will not see the throttle position signal.

2. **Throttle assembly gasket** - if it is torn, there will be air leaks.

3. **Gas cable** - if it comes off the lever, the throttle remains closed.

4. **ECU fuse** (No. 10 in the block under the hood) - sometimes blows when the battery is disconnected.

If everything is in order and the engine does not start, reset the errors through the diagnostic scanner and repeat the throttle training procedure.

How to prolong the effect after cleansing

To keep your damper clean longer, follow these tips:

• 🛢️ Change the air filter every 15 thousand km — a clogged filter increases the vacuum in the intake tract, and oil enters the throttle more actively.
• 🔄 Flush the crankcase ventilation system once every 50 thousand km. B Almera B10 To do this, just remove the pipe from the valve PCV to the throttle and blow it out.
• 🚗 Avoid short trips — if the engine does not warm up to operating temperature, condensation accumulates in the throttle, which mixes with the oil and forms carbon deposits.
• ⛽ Refuel at trusted gas stations — low-quality gasoline leaves more deposits on the walls of the valve.

If you often drive on dusty roads, install oil separator (For example, Mannol Oil Separator) into the crankcase ventilation system. It will filter out 80% of oil vapors before they reach the throttle body. The cost is about 1,500 rubles, but it pays off due to less frequent cleaning required.

When Cleaning Doesn't Help: Alternative Causes of Problems

If the symptoms remain after cleaning the damper, the problem may lie elsewhere. Here's what to check first:

Symptom	Possible reason	How to diagnose
Floating speed	Malfunction idle air controller (IAC)	Check the resistance between the contacts (should be 40–80 ohms). Article: Nissan 22680-4M010.
Jerks during acceleration	clogged injectors	Check the injector balance through diagnostics or clean with ultrasound.
Engine stalls at idle	Air leak through cracks in pipes	Treat the pipes with soapy water - if there is a leak, bubbles will appear.
Lights up Check Engine	Malfunction lambda probe	Check the voltage on the signal wire (should range from 0.1 to 0.9 V).

B Almera Classic B10 often fails absolute pressure sensor (MAP sensor), which is located on the intake manifold. Its malfunction is disguised as a dirty damper: the same floating speed and jerking. Check the voltage at the sensor connector (with the ignition on there should be ~5 V on the power supply and 0.5–4.5 V on the signal).

FAQ: Frequently asked questions about cleaning the throttle body

Is it possible to clean the damper without removing it from the car?

Technically yes, but efficiency will be 3–4 times lower. Without dismantling, you will not clean the bypass channel and the back side of the damper, where the main carbon deposits accumulate. In addition, the cleaner will enter the intake manifold and may damage lambda probes.

How much does it cost to clean the valve at a service center? Nissan Almera Classic B10?

In official services Nissan the price starts from 2500 rub. (excluding the cost of the cleaner). In garage workshops - 1000–1500 rubles. However quality is often poor: not all services train the damper after cleaning, which is why problems return after 1–2 weeks.

Can I use acetone or solvent 646 for cleaning?

Absolutely not! These agents are aggressive to plastic and rubber parts throttle assembly. They can dissolve the seals, which will lead to air leaks. In addition, acetone leaves behind a sticky residue that attracts dust.

How often should you clean the throttle body? Almera Classic B10?

Depends on operating conditions:

• City mode (traffic jams, short trips): every 20–30 thousand km.
• Mixed mode: every 40–50 thousand km.
• Route (long trips): every 60–80 thousand km.

If you use low ash oil (For example, Liqui Moly Top Tec 4200 5W-30), the interval can be increased by 20–30%.

What happens if you don't clean the throttle valve?

The consequences depend on the degree of pollution:

1. 10–20 thousand km without cleaning: floating speed, increased fuel consumption (+0.5–1 l/100 km).
2. 30–50 thousand km: jerks during acceleration, errors P0100 And P0507, difficult starting the engine.
3. More than 50 thousand km: damper jamming in the open/closed position, which may lead to emergency engine stop on the go.

In advanced cases, carbon deposits may break off and enter the cylinders, causing burrs on the walls or valve damage.