Where is the PVC Valve Located????

:banghead: I have a 1991 3.1 Chevy Lumina Euro can anyone tell me how to locate my PVC Valve. I'm not a mechanic but have always done my own tuneups so if someone can also tell me how to easily rotate the damn engine, I'm just a girl. Can I jack it up from the bottom because I am not strong enough to get the damn thing to rotate. Why the hell did Chevy do that?

Under hood, center, upper engine area, mounted in rear valve cover

Under hood, center, upper engine area, mounted in rear valve cover


Thank you very much.

lots of luck with this the hose is usually hard and runs under the upper manifold .. but yes its on the rear valve cover under the map sensor

:banghead: I have a 1991 3.1 Chevy Lumina Euro can anyone tell me how to locate my PVC Valve. I'm not a mechanic but have always done my own tuneups so if someone can also tell me how to easily rotate the damn engine, I'm just a girl. Can I jack it up from the bottom because I am not strong enough to get the damn thing to rotate. Why the hell did Chevy do that?

On my 1990 3.1 liter Euro, the pcv valve is located toward the rear of the engine, beneath the intake plenum. It is not necessary to rotate the engine for the pcv valve, but it is necessary for the rear spark plugs and O2 sensor. Lisle sells a tool to do so. You will have to remove the dog bone motor mounts, and replace one of them with the tool, rotate the engine, and then replace the motor mounts when done. Lining up the motor mounts is difficult for one person. Try to get some help, you can pull on the alternator and pivot it on the bottom mount.

There's a cheat way to roll that motor forward.

I remove the dog bones in the front, with the car in park on a level surface, open the door and start rocking the car forward and backwards, watch the motor as you do...it will pitch fore and aft as it bumps the park pawl...

When you get it to flip forward pretty good, stomp the e-brake, it will freeze in this position. Block the drive wheels so it can't roll and let the motor settle back down, and you'll have plenty of room to work.

Lining up the motor mounts is difficult for one person. Try to get some help, you can pull on the alternator and pivot it on the bottom mount.


I never had much trouble...the bolts are tapered to a point, push them in the hole. rock the car a little while pushing the bolts, they drop through when it lines up...

I agree with McLin, as I own 4 Lumis from'90-'93 all with 3.1 engine. All of the PCV's are in the same place.

There's a cheat way to roll that motor forward.

I remove the dog bones in the front, with the car in park on a level surface, open the door and start rocking the car forward and backwards, watch the motor as you do...it will pitch fore and aft as it bumps the park pawl...

When you get it to flip forward pretty good, stomp the e-brake, it will freeze in this position. Block the drive wheels so it can't roll and let the motor settle back down, and you'll have plenty of room to work.

I have heard that many service stations use that method to rotate the engine. I think it could cause other problems, such as broken wires, particularly on an older vehicle, where time and heat have caused the wires for all the sensors, and injectors, to become brittle. The Lisle tool is less than $20, if it is still available, and does the job without any trauma or drama. I was responding to a lady who wrote in, and was trying to consider that she may not have enough upper body strength to muscle the engine in place, and drive the bolt through the dogbone, using one hand on each. I do it by myself, but it isn't an easy job. No place to use a pry bar. I have also heard of service stations propping a wooden block behind the engine. Again, I would be concerned about damaging other engine parts.

I have heard that many service stations use that method to rotate the engine. I think it could cause other problems, such as broken wires, particularly on an older vehicle, where time and heat have caused the wires for all the sensors, and injectors, to become brittle. The Lisle tool is less than $20, if it is still available, and does the job without any trauma or drama. I was responding to a lady who wrote in, and was trying to consider that she may not have enough upper body strength to muscle the engine in place, and drive the bolt through the dogbone, using one hand on each. I do it by myself, but it isn't an easy job. No place to use a pry bar. I have also heard of service stations propping a wooden block behind the engine. Again, I would be concerned about damaging other engine parts.

The only time I ever saw damage was from neglecting to put the bones back in and putting it in gear :redface: which can cause the motor to flip far enough to really wreck stuff...

But your point is valid. At 300+ pounds, those motors rotate when I lean into the engine compartment to work on them....I have no problem rocking the motor into position to run the bolts through the mounts...

...some have said I look like I'm humping the car....:lol: