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Ford Mustang GT 1996-2004: How to Replace PCV Valve

If the PCV in your Ford Mustang GT isn't working properly, sludge can build up in your intake. Learn how to replace it here.

By Bassem Girgis - October 19, 2015

This article applies to the Ford Mustang GT (1996-2004).

The PCV in your Ford Mustang GT is designed to take all the harmful vapors produced by un-burned fuel from the crankcase back into the intake manifold. The harmful vapors then get burned again in the engine, which helps both your engine from oil contamination and the environment from harmful vapor. The most common test to check if the PCV valve is working is to remove it and shake it; if you hear a clear rattle, this means the valve is in proper working condition, but if you don't hear anything, it means it's time for a new PCV valve. These valves tend to live a little longer than 50,000 miles, but they have been known to fail before then. Replacing it is rather easy and requires almost no prior knowledge. Read on to learn how you can replace the PCV valve in your Ford Mustang GT.

Figure 1. The PCV valve.

Materials Needed

  • Flat head screwdriver
  • New PCV valve

Step 1 – Remove intake tube

The PCV valve is on the passenger's side of the engine, right under the intake tube. You could remove it without removing the intake tube, but it's extremely tight. Using your flat head screwdriver, loosen the clamp on the intake tube from both the air box and the throttle body. Remove the tube out of the way.

Figure 2. Remove intake tube.

Step 2 – Remove old PCV valve

Disconnect the vacuum line connected to the PCV valve by gently pulling it away from the valve. Turn the PCV valve 90 degrees clockwise to remove, then pull it out.

Figure 3. Pull vacuum line out and valve 90 degrees clockwise.

Step 3 – Install new valve

Be sure you've purchased the correct PCV valve for your model and year. A wrong sized PCV valve can affect how your Mustang drives. Install the PCV valve into the passenger's side valve cover. Turn it half a turn counterclockwise. Once it's locked in place, plug the vacuum hose into it and make sure it's snug.

Figure 4. Install new PCV valve.

Step 4 – Install intake tube

Install the intake tube back in place. One end will go onto the air box and the other end will go onto the throttle body. Tighten the clamps on both sides.

Figure 5. Intake tube installed.

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