Honda 11856-RCA-A00 Tube, PCV

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First of all, hoses that make up the emission system of a car need to be checked regularly for deterioration signs such as cracks, leaks, and hardening due to high temperatures. The clamps should be tight and the hoses not distorted. In case there is any blockage in the PCV system hose, it should be cleared. The vacuum hoses need to have matching material and thickness when replaced. To detect leaks, you can use a vacuum hose as a stethoscope. In case there are bends, crimps or cracks on metal lines, then they should be replaced with seamless steel tubing.

When inspecting vacuum hoses, you should pay attention to plastic T-fittings for cracks and hose distortion.

Start the engine and allow it to warm up. With the engine idling, pinch off the crankcase ventilation hose and verify that the PCV valve makes a clicking sound. If there is no clicking sound, the crankcase ventilation hose might be clogged or punctured.

You can use a small piece of vacuum hose as a stethoscope to detect vacuum leaks.

In 2001 and 2002 Acura, as well as 2003 and 2004 Honda models, the fresh air inlet hose connects to the air intake duct and the front valve cover, drawing fresh air into the crankcase. In 2003 and later Acura, along with 2005 and later Honda models, the fresh air inlet hose connects to the air intake duct and the rear valve cover, performing a similar function.