N318-18-921 MAZDA Knock Sensor Rotary Engine

Review MAZDA New Genuine Rx-7 Knock Sensor 1.3l Rotary Engine Oem

Introducing the Mazda N318-18-921 knock sensor, an essential component for maintaining the optimal performance of your 1986-1988 Mazda RX-7 with a 1.3L rotary engine. This high-quality aftermarket part is designed to detect and alert you to any irregular engine knocking or pinging sounds, which can be caused by fuel detonation or engine misfire.

The Mazda N318-18-921 knock sensor is meticulously engineered to meet or exceed OEM specifications. It features a sophisticated design with a built-in microphone that picks up engine vibrations and converts them into electrical signals. These signals are then sent to the engine control module (ECM), allowing it to adjust fuel injection and ignition timing to prevent further engine knocking.

This knock sensor is made from premium materials, ensuring long-lasting durability and reliability. It is also designed to be a direct replacement for the OEM part, making installation quick and straightforward. No need to modify your engine or engine wiring harness, making it a hassle-free upgrade for your Mazda RX-7.

Installing the Mazda N318-18-921 knock sensor is a simple process that can be done in just a few steps. First, locate the old knock sensor on your engine and remove it using a socket wrench and a torque wrench to ensure a secure installation. Next, install the new sensor by hand-tightening the mounting bolts, followed by torquing them to the recommended specification. Finally, connect the electrical connector to the engine control module.

By upgrading your Mazda RX-7 with the Mazda N318-18-921 knock sensor, you can enjoy improved engine performance, better fuel efficiency, and extended engine life. Additionally, this upgrade can help prevent costly engine damage caused by persistent engine knocking or pinging sounds.

In summary, the Mazda N318-18-921 knock sensor is a must-have upgrade for any Mazda RX-7 owner with a 1.3L rotary engine from 1986 to 1988. It offers long-lasting durability, reliable performance, and a straightforward installation process. By investing in this high-quality aftermarket part, you can ensure that your Mazda RX-7 continues to run smoothly and efficiently, providing you with countless hours of driving enjoyment.

Buying a Mazda RX-7 knock sensor for a 1986-1988 1.3L rotary engine (part number N318-18-921) can be a crucial decision for car enthusiasts and mechanics. Here are some potential pros and cons to consider before making a purchase.

1. Improved Engine Performance: A faulty knock sensor can lead to engine misfiring, loss of power, and poor fuel efficiency. Replacing the sensor can help restore proper engine performance and improve overall driving experience.

2. Preventing Major Damage: A malfunctioning knock sensor can cause catastrophic engine damage if left unattended. Replacing the sensor early can save you from costly repairs in the future.

3. Enhanced Safety: A knock sensor plays a crucial role in preventing engine knocking and pinging, which can be dangerous and potentially lead to engine failure.

1. Cost: Replacing a knock sensor can be an expensive repair, especially if you are not doing it yourself. The cost of the sensor itself, labor, and other related expenses can add up.

2. Availability: Finding the correct knock sensor for a specific model and year of the Mazda RX-7 can be challenging. Make sure to double-check the part number and compatibility before making a purchase.

3. Installation Complexity: Installing a knock sensor in a Mazda RX-7 can be a complex process, especially for those without mechanical experience. It may require specialized tools and knowledge.

Replacing a knock sensor in a Mazda RX-7 can be a worthwhile investment for those looking to restore proper engine performance, prevent major damage, and ensure safety. However, the cost, availability, and installation complexity are important factors to consider before making a purchase. If you are confident in your mechanical abilities and have the necessary tools, purchasing the sensor and installing it yourself can save you money. Alternatively, taking your car to a professional mechanic can ensure a proper installation and peace of mind. Ultimately, the decision to replace a knock sensor depends on your budget, time, and mechanical expertise.

Details:

Note that some are manufacturer-provided and may not precisely represent the items color, size, or style. Replacing your aging sensor with a genuine Mazda unit ensures factory-spec resistance and reliability that aftermarket sensors often lack. Material: steel, plastic, copper. Finish: zinc plated.

New genuine Mazda rx-7 N318-18-921 knock sensor 1986 -1988 1.3l rotary engine oem. It may have minor cosmetic imperfections such as small scratches or blemishes but is fully functional and has never been installed used. Mounting style: screw-in. Because of the heat cycles in rx-7 engin, plastic connectors on these original sensors often become brittle and fail.

Up for sale is a genuine oem Mazda knock sensor, part number N318-18-921. Color: silver / natural metal. Placement on vehicle: engine block. Compatibility: make: Mazda.

Country/region of manufacture: japan. This is a new old stock nos item, meaning it factory-original Japanese part that has never been installed. Item specifics: brand: Mazda. Knock sensors are critical for protecting your rotary engine from detonation by sending vibrations to the ecu adjust timing.

Condition: new other: a new, unused item with no signs of wear. Type: knock sensor. The item may come without its original packaging, or the packaging be opened slightly damaged. It comes in the original Mazda bubble-wrap packaging with authentic label.

Not needed, not compatible. Manufacturer part number: N318-18-921.

specifications ignitioncomp:

• for years: 1986–1988
• brand: Mazda
• mpn: N318-18-921
• type: Knock Sensor
• country of origin: Japan

shipping ignitioncomp:

• carrier: usps, ups, fedex
• service: usps priority mail, ups ground, ups next day air saver, fedex standard overnight
• class: expedited, standard, one-day
• type: calculated
• transit: 3-8 days

seller ignitioncomp:

• rating: 99.6%
• city: plano, texas
• # reviews: 2920

payments ignitioncomp:

• credit card: mastercard
• wallet: google-pay
• other

returns ignitioncomp:

• paid by: seller
• time: 30 days
• policy: returns accepted

general ignitioncomp:

• category: Auto Parts > Car Truck Accessories > Ignition Systems Components

offer ignitioncomp:

• started: february 25, 2026
• availability: in stock
• in stock #: 5
• best offers: true
• prices: $195.98–$280.25
• item condition:
  • New other (see details)
  • New
• options: ship-to-home
• sold #: 13