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Porsche992 (911) MK2 2024>>992.2 Carrera 4 GTS 3.6L 2024>>Engine Electrical

Injectors

Injectors

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LIQUI MOLY Pro-Line Direct Injection Cleaner 120ml - 21281
1
LIQUI MOLY Pro-Line Direct Injection Cleaner 120ml
LM21281
Product Information
Product Information

LIQUI MOLY Pro-Line Direct Injection Cleaner - 120ml

LIQUI MOLY Pro-Line Direct Injection Cleaner is an advanced petrol fuel additive designed to remove deposits from fuel injectors, combustion chambers and piston surfaces. Its powerful polyetheramine (PEA) formula helps restore efficient fuel delivery, improve combustion and maintain smooth engine performance.

Fits:

  • Porsche Boxster 987 MKII 2009-12
  • Porsche Boxster 981 2012-16
  • Porsche Boxster 718 2017>>
  • Porsche 997 MKII 2009-12
  • Porsche 991.1 2012-16
  • Porsche 991.2 2016-19
  • Porsche 992.1 2019-24
  • Porsche 992.2 2024>>
  • Porsche Cayman 987C MKII 2009-12
  • Porsche Cayman 981 2013-16
  • Porsche Cayman 718
  • Porsche 957 Cayenne 2007-10
  • Porsche 958 Cayenne 2010-17
  • Porsche 9YA Cayenne 2018-23
  • Porsche 9YA.2 Cayenne 2023>>
  • Porsche 970.1 Panamera 2009-13
  • Porsche 971.1 Panamera 2017-20
  • Porsche 971.2 Panamera 2021-23
  • Porsche 976 Panamera 2023>>
  • Porsche 95B.1 Macan 2014-18
  • Porsche 95B.2 Macan 2019-21
  • Porsche 95B.3 Macan 2022>>

Developed particularly for modern direct injection petrol engines, it also helps reduce the risk of low-speed pre-ignition (LSPI), which can cause serious engine damage.

What Does LIQUI MOLY Pro-Line Direct Injection Cleaner Do?

The additive removes deposits from fuel injectors and combustion chambers, helping maintain correct fuel spray patterns and efficient combustion. This can improve engine responsiveness, reduce fuel consumption and support smoother running.

Why Do Fuel Injectors Become Contaminated?

Fuel injectors are exposed to high temperatures and combustion deposits. Over time, carbon and other contaminants can accumulate around injector nozzles, disrupting fuel delivery and potentially causing rough running, increased fuel consumption or reduced engine performance.

When Should It Be Used?

LIQUI MOLY recommends the additive for periodic fuel system maintenance, particularly in direct injection engines. It can help address deposit-related performance issues and maintain injector cleanliness.

For best results, treatments should be spaced at least 5,000km apart.

Not suitable for diesel engines.

Key Features

  • Advanced PEA cleaning technology.
  • Removes deposits from petrol fuel injectors.
  • Cleans combustion chambers and piston surfaces.
  • Helps restore efficient fuel spray patterns.
  • Reduces the risk of low-speed pre-ignition (LSPI).
  • Supports smoother engine operation and fuel efficiency.
  • Suitable for direct and manifold petrol injection systems.
  • Ideal for periodic fuel system maintenance.

Application Instructions

  • Add the contents directly to the petrol fuel tank.
  • One 120ml can treats 30–50 litres of petrol.
  • The additive mixes automatically with the fuel.
  • Repeat no sooner than every 5,000km for ongoing maintenance.

Follow vehicle manufacturer recommendations where these differ from the standard dosage.

Product Category Description – Porsche Direct Injection & Fuel System Cleaners

LIQUI MOLY Pro-Line Direct Injection Cleaner provides an effective fuel system cleaning solution for Porsche petrol engines, helping remove injector deposits and maintain efficient combustion.

Particularly suited to modern direct fuel injection Porsche engines, including the 997.2, 991, 992, Boxster, Cayman, 718, Cayenne, Macan and Panamera, it helps maintain injector performance and reduce deposit-related running problems.

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About Injectors

Fuel Injectors – Precision Fuel Delivery for Porsche Performance

Fuel injectors are critical components in your Porsche’s engine management system, responsible for delivering precise amounts of fuel directly into the combustion chamber. They ensure efficient fuel atomisation and optimal air-fuel ratios, which are essential for smooth performance, responsive acceleration, and reduced emissions.

At Design911, we offer a comprehensive selection of genuine and high-quality fuel injectors for Porsche models including 911, Boxster, Cayman, Cayenne, Macan, and Panamera. Each injector is engineered for accuracy, flow consistency, and reliability — ensuring your Porsche maintains its renowned performance and efficiency.

What Do Fuel Injectors Do?

Fuel injectors deliver pressurised fuel into the engine at precise intervals, ensuring perfect combustion. Their primary functions include:

  • Metering and atomising fuel for efficient combustion.
  • Maintaining correct air-fuel ratio under all load conditions.
  • Optimising performance and throttle response.
  • Reducing emissions and fuel consumption.

A properly functioning injector ensures smooth idle, crisp acceleration, and optimal power output — critical for both daily driving and high-performance applications.

Why Do Fuel Injectors Fail?

Fuel injectors operate under high pressure and extreme heat, making them prone to gradual wear or contamination. Common causes of failure include:

  • Fuel contamination from debris or poor-quality petrol.
  • Clogged or restricted nozzles due to carbon buildup.
  • Leaking seals or o-rings causing pressure loss.
  • Electrical faults in injector coils or connectors.
  • Corrosion from ethanol-blended fuels or moisture.

Symptoms of faulty injectors include rough idle, engine misfires, increased fuel consumption, loss of power, or a check engine light.

Why Replace Faulty Fuel Injectors?

Replacing worn or damaged fuel injectors restores your Porsche’s engine efficiency and responsiveness. New injectors ensure precise fuel delivery and balanced performance across all cylinders.

Benefits of replacement include:

  • Restored engine smoothness and performance.
  • Improved throttle response and power delivery.
  • Reduced emissions and better fuel economy.
  • Reliable combustion with manufacturer-quality precision.

Our range of injectors is designed using high-precision engineering and corrosion-resistant materials, ensuring consistent spray patterns, flow rates, and long service life in all conditions.

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