C4in mesa

I have a thread Damaged oil sensor threads. In it I am describing putting the intake manifold back on. Keep in mind I bought the car 4 months ago. I never thought about the PCV line running behind the motor and up to the throttle body. I also didn't bother to check to see if it even had a PCV valve. Turns out the line that should have the valve does not. The drivers side back by the brake booster is capped off. Since removing and cleaning the intake I ordered an oil catch from Corvette Mods. $43 shipped. I ordered a bent PCV hose for $7 from Autozone (U shaped) because mine broke off when I was removing the intake manifold. Very brittle likely original. My concern is all the oil having been sucked into my engine for possibly a very long time. The manifold was filthy. I never had a code. Does this mean no code will occur from the PCV system ? I would appreciate some feedback on this subject. I am going to check with a dealership today and see if the grommet is available that is on the drivers side in the back. I'll also see if I can get away with cheap hose rather than spending God knows what on original equipment.

C4in mesa

To answer my own question I see the 2004 LS1 and LS6 don't have a PCV valve.

Last C5

The LS1 and the LS6 manifolds were identicle in 2004 and the tube coming out of the valley plate has a restriction in it that acts as the PCV valve.

LoneStarFRC

True story.

SteveDoten@ARH

I never realized that the tube acted as a PCV. Interesting.

LoneStarFRC

Supposed to be a "fixed orifice", although I've never personally dissected one to see. I think the LS2 is the same.

Bill Curlee

I Agree! The 2004 model had a FIXED ORIFACE restrictor. It looks exactly like a normal PCV Valve but there is NOT a spring loaded pintal valve inside the PCV. There is a small fixed hole in the large end of the valve. From all that Ive read, your PCV system should look like this:



Yes,, the drivers side valve cover SHOULD have a plug in the hole where the LS1 PCV valve normaly takes a suction on the drivers side of the engine.

Bill

LT1driver

do the 01-03 Zs have same setup as 04Z??

Bill Curlee

My 02 ZO6 has a normal PCV Valve.

Bill

tblu92

Whether or not it has an actual PCV valve or not---ALL engines MUST have some sort of a crankcase ventilation system or some sort of a PCV "system"---If your car does not have an actual valve then it most likely had a fixed orifice PCV system----
Having one valve cover capped off is no big deal as long as you have one valve cover at least vented to atmosphere OR to the T-Body and the other PCV line connected somewhere onto the intake manifold so the engine vapor can be drawn into the intake--
This creates a system where fresh air is circulated thru the crankcase and is allowed to be circulated and drawn and burnt in the engine--
If you had NO crankcase ventilation or PCV system----Pressure would build up in your crankcase --so high that you would eventually blow a valve cover seal or have some sort of oil leak---Beyond that an engine cannot run with pressure in the crankcase as the rings won't seal correctly and create other issues as well---
In drag racing they go even further and install aftermarket vacuum pumps that actually INCREASE the crankcase vacuum---This added vacuum has proven HP gains as it produce better ring seal and combustion

C4in mesa

I have a U shaped hose nothing else. I am going to install a oil catch in line here. I haven't gotten it yet but the pics show it connected right there.

pmr2000

Not to hijack this thread but should I replace the PCV valve as a maintenance item on my recently acquired '01 base coupe, 63k miles? Did not receive any records with the car.

Bill Curlee

The air flow through the PCV system MUST be regulated. It can NOT (should not) be connected directly to the intake vacuum port without a restriction. The PCM Tuning is designed to compensate for the air flow through the PCV system which bypasses the Throttle Blade.

I have never taken a 2004 valley cover PCV Baffle apart but I can NOT see why GM would engineer a restriction into a baffle that you can not easily access/clean/ replace as a TUNE UP item.

C4in mesa

Can anyone tell me what this very small hose or line is ? It's located in the back of the block passenger side.

Bill Curlee

LOL!! WHY,,, YES I CAN!

Its the vacuum line that supplies vacuum to the vacuum canister in the passengers fender well.. That vacuum reservoir supplies a vacuum source for the HVAC DAMPER DOOR SERVOS. It also provides vacuum to the AIR Pump control valve. The valve uses vacuum to open the valve and supply air from the pump to the A.I.R. Check valves on the manifolds

When I did my heads and cam install, I lengthened mine:






VACUUM RESERIOIR:



This is where the nylon vacuum line comes out of the main wire harness:




Here is a picture of the A.I.R. Pump with the vacuum operated control valve in the area below the drivers side head light:

Bill Curlee

If you have a Dual ZONE HVAC System,, I bet you that when you use your HVAC System, the AIR blows out through ALL the vents OR you can not properly control where you want the air to come out of!

The air dampers use that vacuum to operate these servos to position the damper doors to shift the position where the air exits.








The PURPLE HOSE in this picture is the SUPPLY line for the vacuum controller pictures... That hose connects to the vacuum reservoir.

C4in mesa

I assume this is where it plugs into on the manifold. For sure lengthening it will help me reconnect it. The brake booster line is disconnected at the brake booster giving me the flexibility to reconnect it until it's all bolted down.

C4in mesa

I extended the vacuum hose using O'Reilly hose and connectors. I broke the lip off one injector changing the o-rings. Have to buy a replacement. Always something.

SaberD

This is the fixed orifice pcv valve that you can use on an ls1, however, I don't think the one inside the ls6 pcv canister looks anything like this. I have to say though, I've never seen the ls6 pcv canister under the valley cover disassembled. It would be highly educational if anyone has pictures.

C4in mesa

Here's my oil catch can. It goes right in the place where the curved hose goes or 2001-2003 Z06 the PCV valve goes. I assume 1997-2003 C5 the same.