mcfack

Last weekend I noticed I have two PCV valves. One on each side of the engine. A friend confirmed he only has one on the driver's side of the engine.

Is there anything wrong with this? My car runs with a lope like it might have a cam, but I don't know since I have only had the car a few months. I have uncovered fuel pressure drop off too early and a low vacuum issue (just for some background).

Any thoughts? Should I remove one of them? Why would there be two to begin with?

STL94LT1

A picture or a description of your engine would help.

Aardwolf

Are you sure there is a valve there? My year had a breather there that looks like a PCV valve on the passenger side but it is not.

Fuel pressure drop off sounds like a failing pump, line obstruction, or poor electrical feed to the pump. To test, unplug the vac line at the FPR and run it to WOT to see if the pressure falls off.

PLRX

I'm on my second Vette. My first was a 92 LT1 and my 95 LT1. Both of them had One (1) PCV which is on the drivers side of the engine. There is an "air line" that goes from the valve cover to the TB (passenger side).

If there is a second PCV, I'd love to know..You'll be surprised, the chevy dealer's computers says that my Vette uses four (4) O2 sensors...It has three (3).

Demonic85

Driver's side should have the PCV, passenger side has a breather. When I bought new valve covers, had to use different PCV and breather, so I bought 2 PCV and removed the valve from one of them to use as a breather. Take yours out and shake it, if it rattles, then its a PCV. I wouldnt leave it in there if that is the case.

StealthLT4

Yup, the pass side is a crankcase breather. Definitely don't put a PCV valve in there...

AGENT 86

Thats what I did for my covers, too.

mcfack

FYI - I have removed both PCVs and both rattle like they are in good shape.

Someone asked for an engine pic.



So, if I remove the passenger side PCV, can I buy the breather side plastic piece to plug my vacuum hose into from the local store? It seems that the suggestion so far is to remove the valve from one side.

Also, I have an 89 model.

Thanks for the posts.

Demonic85

Yes you can (and should) remove the valve from the passenger side. Technically you could just pull it out and leave it open, but then you would have unfiltered air getting in there. They also make push in breathers with a little filter you can use as well, looks like this...

AGENT 86

Do not use a breather !! The fresh air that is used by the the PCV is metered through the MAF. Any un-metered air ingested through the PCV is only going to make things worse.

rodj

And if it has two PCV valves were does the air enter to purge the crankcase gases.
As noted pathway should be metered air from
TB - rocker cover - PCV valve in other cover - intake port

mcfack

Thanks dudes. I will have an update if changing this effects my engine operation.

Demonic85

oops sorry I didnt know that. I just ran a rubber hose into the valve cover from the TB on mine. Good thing I didnt use one of those.

conv90

You can do this ONLY on a 90 or 91 with a MAP system.
As AGENT 86 said, don't do it on a MAF car.
-Beppe-