Where is the PCV valve located?

1995 CHEVROLET MONTE CARLO
180,000 MILES • 3.4L • V6 • 2WD • AUTOMATIC
Avatar
JJSMONTE
  • MEMBER
  • 3 POSTS
A few days ago, my 95 3.4l DOHC blew off a small vacuum line along with the large hose that goes from the brake booster to the intake. Lost brakes and idle control due to the large line being disconnected. Reconnected both lines and runs fine, but the large brake booster hose collapses on itself due to too much vacuum. Suspect PCV valve but not sure and cannot find it to try and replace. I have the new valve already.
Jul 26, 2025 at 6:12 AM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
I don't think the PCV valve will fix the vacuum line you may need to replace it, but here is the location of the PCV valve as requested. Did the engine backfire and that is why the vacuum lines came off? Check out the images (below). Please let us know what happens.
Image (Click to enlarge)
Attached Media
Jul 27, 2025 at 11:30 AM
Avatar
JJSMONTE
  • MEMBER
  • 3 POSTS
The engine must have backfired. It was right as I started the engine.
Jul 28, 2025 at 7:25 AM
Advertisement
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
Yep, that will do it, did you find the PCV valve?
Jul 28, 2025 at 12:39 PM
Avatar
JJSMONTE
  • MEMBER
  • 3 POSTS
No, I haven't found it. Kind of hard to tell what I'm looking at in the diagram, and I was expecting it to be on the valve cover. What should I look for that could have caused it to backfire?
Jul 29, 2025 at 3:22 AM
Avatar
STRAILER
  • CERTIFIED EXPERT
  • 53,854 POSTS
It looks like the PCV might be under the intake manifold. A back fire can be caused by the engine not cranking over enough before running which will make it "cough" or you need to replace the spark plugs, wires and coil assembly.
Jul 29, 2025 at 10:43 AM