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2011-2016 Cruze 1.4 PCV Valve Cover/Intake Manifold Issues

665971 Views 547 Replies 171 Participants Last post by  Blasirl
2011-2016 Cruze 1.4L PCV Valve Cover/Intake Manifold Issues

Video:
I made a video to help better explain how this whole PCV system works to supplement this article.


Overview
I find myself having to explain this issue to someone almost daily, so in the interest of brevity, I'm creating a thread specifically for people to reference quickly if they have an issue.

The Cruze 1.4L Turbo engine has a terrible PCV check valve design that afflicts 100% of cars I have come across. It's not a matter of if, but when, it will fail. There are three primary components to this system that frequently fail: the PCV regulator diaphragm (some people call it a check valve) on the valve cover, the check valve in the intake manifold, and the corrugated hose going from the intake manifold to the turbo. We will focus on the first two, which are the most likely failures.


Symptoms
Depending on how long you've had this issue, your vehicle may throw a check engine light with any or all of the following codes (DTCs):
P0171
P0106
P1101
P0507
P0299
P2096


Note: lack of check engine light does not mean everything is operating correctly!

Your vehicle may also exhibit any or all of the following symptoms:
  • Elevated oil consumption
  • Smoke blowing through the tail pipe
  • A hissing sound in the engine bay
  • A rough/stumbling idle
  • Loss of power
  • Reduced fuel economy


Diagnosis
Valve Cover
With the engine running, inspect the vent on the PCV regulator diaphragm. The PCV regulator diaphragm has a round non-removable cap on the driver side of the valve cover. Remove the cosmetic cover off of the valve cover:


Underneath, you'll find the cap that covers the PCV regulator diaphragm. If this has failed, the engine will be sucking in air from here, and creating a hissing sound. Place your finger over this hole to cover it. If the engine RPMs change or the hissing stops, the valve cover needs to be replaced.


DON'T STOP THERE! Failure of the valve cover PCV regulator diaphragm may only be a symptom of a greater problem: the PCV check valve in the intake manifold. If the intake manifold PCV check valve has failed and you only replace the valve cover, you will find yourself replacing valve covers every few months not knowing why.


Intake Manifold PCV Check Valve
With the engine off, locate the corrugated hose coming out of the top of the PCV check valve:


With tightly gripped pliers, remove the clip holding the hose off by pulling it out:


Pull the corrugated hose off from the base, taking care not to pull from the hose itself as it may crack or tear. Using a flashlight, look inside the hole. If you are facing the engine bay from the front, there should be an orange/pink/peach nipple/valve on the "back" of that hole that looks like this:


If you don't see that check valve, use q-tips and rubbing alcohol to clean that area and check again. If you still don't see it, this must be addressed.

There's one final part that needs to be checked:


PCV Hose/Valve
In the last section, you need to remove a hose from the intake manifold. That hose has another check valve at the other end of it; at the turbo inlet. To verify its functionality, blow into the hose; it should blow freely. Suck air back through the hose; it should completely block airflow. If it doesn't do either of these, the whole thing needs to be replaced. Those hose also has a tendency to become brittle and crack, at which point it will also need replacing. Be sure to check this hose everywhere if you suspect it is leaking or are hearing a hissing sound in the engine bay.


Repair Solutions
Both of the above components are covered under your powertrain warranty. If your car is still under powertrain warranty, bring your car to the dealer and tell your dealer you are experiencing oil consumption of one quart per 1,000 miles and to reference GM Bulletin PIP5197C.

If the PCV regulator diaphragm on the valve cover has failed, replacement is required and will cost ~$60. Refer to this tutorial for replacing the valve cover. How-To: Replace the Valve/Camshaft Cover (1.4L Turbo)

If the check valve on the intake manifold is missing, you have three options:
1. You can replace the intake manifold with a new one. As of late early 2018, GM is phasing out the intake manifold that ships with all accessories and is selling a bare intake manifold. I don't yet have the part number for that.
2. Dorman has begun releasing an option. However, this option has the same check valve design as the GM manifold, meaning it will be prone to failure and boost leaks, and is not serviceable. The part number is 615-380, but availability is currently limited.
3. You can install one of my Intake Manifold PCV check valve fix kits for as little as $75, which is much cheaper than the Dorman intake (after shipping) while providing you a more robust, leak-free, and durable check valve. My external check valve design allows for easy (doesn't require removal of the intake manifold) servicing and cleaning, and inexpensive replacement. Details are in this thread: GM 1.4L Turbo Intake Manifold PCV Valve Fix Kits

A tutorial for removing the intake manifold is located here: How-To: Remove 2011-2016 Cruze 1.4L Intake Manifold

If the check valve at the turbo inlet has malfunctioned or the hose is cracked, you will need to replace it: ACDelco 25193343 PCV Pipe with Valve


Resources
To learn more about this engine's PCV system, refer to the following thread: 2011-2016 Cruze Limited 1.4L PCV System Explained

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I definitely need a new valve cover. I would also like to get the after market V3.4+ GM 1.4L Turbo.
The clarification I need is, do I still need to fix the Intake Manifold PCV Check Valve and/or the hose check valve if I get the after market kit? Does the kit replace those parts?
 

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Discussion Starter · #522 ·
I definitely need a new valve cover. I would also like to get the after market V3.4+ GM 1.4L Turbo.
The clarification I need is, do I still need to fix the Intake Manifold PCV Check Valve and/or the hose check valve if I get the after market kit? Does the kit replace those parts?
The pcv fix kit fixes the intake manifold check valve failure. You’ll still need a new valve cover if that has failed. You should be able to clean the terminal on the pcv pipe check valve if it’s leaking at all, since you’ll have to reuse those parts from the old hose.


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2014 LT program car, Pull Me Over Red, 1.4T Auto
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I definitely need a new valve cover. I would also like to get the after market V3.4+ GM 1.4L Turbo.
The clarification I need is, do I still need to fix the Intake Manifold PCV Check Valve and/or the hose check valve if I get the after market kit? Does the kit replace those parts?
Welcome Aboard!(y)

Don't forget to introduce yourself and your Cruze here.
 

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It's not a Cruze, it's his relative from europe, opel astra j 1.4 turbo 140 ponies
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My cheap pcv system still works as intented. The car is nearly done so it should be back on the road next week.
 

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I followed all the steps and both my intake check valve and my hose check valve were both good. But when I would plug the hole on the valve cover nothing would happen. When I pull the dipstick out you can hear the hissing sound like there is a leak somewhere. Just curious if I should replace the valve cover and see or take a different route?
 

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2014 LT program car, Pull Me Over Red, 1.4T Auto
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I followed all the steps and both my intake check valve and my hose check valve were both good. But when I would plug the hole on the valve cover nothing would happen. When I pull the dipstick out you can hear the hissing sound like there is a leak somewhere. Just curious if I should replace the valve cover and see or take a different route?
Is the check valve installed correctly? When you say "But when I would plug the hole on the valve cover " you did permanently plug the hole right? Look to see if it is still plugged.
 

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I was thinking it was my valve cover so I replaced it. Did not fix the hissing issue coming from the crankcase. The original check valve in the intake is there but was wondering if there is a way to throughly clean it in case it is plugged without pulling the intake.
 

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2013 Cruze LT
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I was thinking it was my valve cover so I replaced it. Did not fix the hissing issue coming from the crankcase. The original check valve in the intake is there but was wondering if there is a way to throughly clean it in case it is plugged without pulling the intake.
Nope, get a fix kit from cruzekits.com or replace the intake manifold. Pulling the intake doesn't matter, you can only clean one side of it.
 

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2016 Cruze Limited
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Is there an extended warranty program for replacing the intake manifold? The PCV regulator diaphragm on my wife's Cruze has failed so she's going to have that replaced; I wasn't able to see the check valve in the intake manifold, so I ordered the fix kit but would rather start with a new one.

As an aside, the Chevy TSB (and special warranty program) is N192210230 - 10 years / 120K miles.
 

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Hey guys I think I tracked my oil leak To the throttle body i think. I have oil dripping on the driveway. Can this be from the PCV valve issue or separate problem? I also see some around the oil cap or valve cover gasket not sure but seems to be coming out of the oil cap rather than the gasket. I just wiped it all down so I can try to track it the next time I drive it. If anyone can help me to diagnose and how to repair it would be much appreciated.
I’m having the same problem with my 2014 Chevy Cruze 1.4L
 

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Nope, get a fix kit from cruzekits.com or replace the intake manifold. Pulling the intake doesn't matter, you can only clean one side of it.
I got a kit from Cruzekit.com and put it in but it seems like it does not want to keep up to speed. If I set the cruise at 70 in 6th gear it stays at like 66-67 unless going down a hill then it will catch back up to 70 until I go up another hill. Was wondering what I should maybe look into next if there is something else that is a common deal on these cars?
 

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2014 LT program car, Pull Me Over Red, 1.4T Auto
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I got a kit from Cruzekit.com and put it in but it seems like it does not want to keep up to speed. If I set the cruise at 70 in 6th gear it stays at like 66-67 unless going down a hill then it will catch back up to 70 until I go up another hill. Was wondering what I should maybe look into next if there is something else that is a common deal on these cars?
The fix kit does not really have any direct connection to your Cruise Control system.
 

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Hi. My first time writing but been reading a lot. I have Opel Adam s with the 1.4t ecotec.
I'm not sure if the valve cover is dead since the car runs kind of okay (loosing power when hot) and making no suction noise until I put my finger on the diaphragm hole, than the engine begin to stumble and make all kinds of noises.
Can you please help me figure out if the cover is dead?
Video of the simptom

Thank you
 

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Hi. My first time writing but been reading a lot. I have Opel Adam s with the 1.4t ecotec.
I'm not sure if the valve cover is dead since the car runs kind of okay (loosing power when hot) and making no suction noise until I put my finger on the diaphragm hole, than the engine begin to stumble and make all kinds of noises.
Can you please help me figure out if the cover is dead?
Video of the simptom

Thank you
Having similar high pitch sound when I turn off the engine
 

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I also preformed a boost leak test and the crankcase was pressurizing. Not at the rate of the air coming through the air pipes but it was significant. I've checked the pcv valve with a cheapo USB endoscope, after spraying some carb cleaner, and the nipple was there. The holes where black but it seems the rubber is behind them just dirty (I'm planning on making the fix).
I believe the pressure in the crankcase from the boost is what shot the valve cover.
What can cause the pressure in the crankcase except the pcv valve failure? Excessive blow by? Something less Intimidating?
 

· Administrator
2014 LT program car, Pull Me Over Red, 1.4T Auto
Joined
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14,174 Posts
Hi. My first time writing but been reading a lot. I have Opel Adam s with the 1.4t ecotec.
I'm not sure if the valve cover is dead since the car runs kind of okay (loosing power when hot) and making no suction noise until I put my finger on the diaphragm hole, than the engine begin to stumble and make all kinds of noises.
Can you please help me figure out if the cover is dead?
Video of the simptom

Thank you
PCV Fix Links
 

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Extreme Revolution or anyone...
What's this that's plumbed into the valve cover and how is it plumbed into the system and what's the purpose. I have read all over this forum and didn't see any info about it.

My wife's Cruze has a little excessive crank case pressure at idle, at least I think it does. When I take the oil cap off it isn't crazy but I do have issues with it pushing oil out of the timing cover, I thought it was the oil pan leaking but I put dye in it last night and ran it for a few minutes and then crawled under the car and the dye was leaking so bad it was dripping on the floor and I couldn't tell where the leak was so I sprayed it all of with brake cleaner and used my air compressor to blow the engine off and to blow away any dye residue.

I had my son start the car and within a minute or two I could see the timing cover was leaking quite a bit. Her car leaves a hug mess when sitting on the street. I already changed the timing cover seal and that didn't appear to be leaking at all last night. I did the pcv fix kit along time ago, but it doesn't seem to be reducing crankcase pressure. Not sure how to check the pcv valve system with the manifold fix kit installed. Putting my finger on the diaphragm hole does nothing. Not sure if the head gasket is leaking a bit and causing excess pressure or what the deal is.

I build high HP turbo LS engines and I'm not really familiar with this engine. I don't use a pcv system on my builds because we just use catch cans that are open to the air. I will be going through the PCV check procedures as they are written but any additional help would be great. Also really want to know what the fitting and hose on the valve cover is for. Also has anyone converted their coil harness to work with LS coils without buying the really expensive kit and harness. I tried finding a diagram but I failed. Thanks. Really enjoy the Cruze eco, I just wish it had better lumbar support because I have a terribly bad back. Lol

Motor vehicle Automotive design Auto part Engineering Automotive fuel system
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