The cold air intake system in your Toyota 4Runner SUV is a specialized version of the traditional air intake. While a standard air intake, or air induction system as some call it, delivers outside air – no matter what temperature -- through an air filter and to the engine to help fuel combustion, a cold air intake is designed to bring cooler air to the engine. Since cooler air has a higher density, it contains more oxygen per volume unit than warmer air. That, in turn, offers improved engine efficiency and performance.

How a Cold Air Intake is Constructed

A cold air intake system can be made of plastic, rubber, metal, or a composite material like fiberglass, carbon fiber, or Kevlar. Most have an airbox and an intake snorkel that ensure sufficient air is delivered to the engine. Some feature heat shields to isolate the air filter and route cooler air from the engine bay's front or side. Others mount the filter into the fender wall to deliver even cooler air.

However, even the best cold air intake system can wear out over time. When that happens, you'll find that your engine isn't performing as you're accustomed.

How to Recognize Cold Air Intake Issues

Signs of problems include:

The "Check Engine" dash light comes on
Your engine idles at a different rate than usual
Reduced engine performance
Higher revving engine

Repair Your Air Intake With Genuine Toyota Parts

If an inspection reveals that repair or replacement is required, you'll want to make sure that you choose the best parts for your SUV. Your manufacturer makes the only air intake parts that are guaranteed to be compatible with your Toyota 4Runner. Our online auto parts store has everything you need for the job. Buy now and we'll ship your order straight to your home!