How to Replace PCV Valve in 3800

The purpose of the PCV (Positive Crankcase Ventilation) Valve is to re-route unburnt fuel fumes back into the combustion chamber.

Some of the symptoms of a nearly clogged PCV include a rough idling engine, loss of power, oil burning, an oily air filter, decreased mpg, or blown seals.

What you’ll need:

  • 10mm wrench
  • Pliers
  • ACDelco – CV948C (PCV valve)
    • ~$3 part

Estimated time:

  • 10-15 minutes

Here’s how I initially found the issue, you can see the bottom of my MAF screen is now stained from the oil that was passing through it.

Step 1:
First locate where your PCV valve is; on the 3800 engine you can find it under this diamond shaped cover which is marked “PCV”. Use your 10mm wrench to remove this.

Step 2:
Once you remove that cover what you’ll find is the PCV valve inside a spring. Grab the spring with your pliers and the PCV valve should very easily lift right out along with the spring.

Step 3:
Simply pull the old PCV valve out from the spring, and place your new one back in. My old one was blackened and mangled, the new one is pictured below.

Step 4:
Put everything back together the way it was and you’re done!!

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