GM 1.4L Turbo Intake Manifold PCV Valve Fix Kits


Read this entire page before purchasing a PCV Fix Kit!!!

These fix kits apply to the following vehicles with the GM 1.4L Turbo LUJ/LUV/A14NET engine:
2011-2016 Limited 1.4L Cruze
2011-2018 Chevy Sonic/Aveo
2015+ Chevy Trax
2015+ Buick Encore
2011+ Opel/Vauxhall Corsa (Turbo only)
2009+ Opel/Vauxhall Astra J (Turbo only)
2010+ Opel/Vauxhall Meriva B
2011+ Opel/Vauxhall Zafira Tourer 

The 1.4L Turbo engine (LUJ/LUV) in the Chevy Cruze/Sonic/Trax and Buick Encore has a check valve in the intake manifold that has a 100% failure rate. Out of warranty, it can cost as much as $350 to replace. There is no redesigned part for this (at the time of this post's writing), and new intake manifolds are still failing regularly. The Dorman intake reportedly has the same flawed design. This thread presents two fix options that are both cheaper than all other aftermarket options. 

DISCLAIMER: This solution has been tested, proven, and is generally considered reliable. To ensure a proper install, MAKE SURE YOU READ AND UNDERSTAND EVERYTHING IN THIS POST. Neither I nor nor accept any liability for what happens during or after the installation of this kit. Proceed at your own risk. This is a kit that is being offered for your convenience. It is your responsibility to ensure that the components are working correctly and remain in good operating condition to prevent any issues. It is your repsonsibility to ensure that the components are clean (such as the check valve and the brake booster tee fitting on the V2 kit) to ensure there are no potential issues. 

As of 1213/19, we have shipped over 2800 PCV Kits to GM 1.4L Turbo owners in the USA, Canada, Australia, Italy, Finland, Germany, New Zealand, the UK, Romania, and Spain. Owners have up to 60,000 problem-free miles on their kits. 

Read the first post on the following thread, which explains how our PCV system works and will help you understand the solution better: 

The basic principle is simple. You have two chambers; the intake downstream of the throttle body, and the PCV chamber. You need to allow gas to freely flow from the PCV chamber into the intake chamber when the engine is under vacuum (not producing boost), but block that flow of gas when the engine is producing boost. The OEM intake manifold check valve serves this function well, while it works, but the check valve stops sealing well after a few thousand miles, producing an audible boost leak, sometimes disappears altogether, or gets stuck and no longer produces vacuum on the crankcase. This solution offers you the opportunity to cleanly retrofit a durable, leak-free external check valve that can be serviced easily and replaced for $15 should the check valve itself ever fail. 

Benefits to this fix kit are:
- Extremely robust, overbuilt components that ensure many miles of trouble-free operation. To date, not one person has needed to service their check valve after installing this kit. This kit use only high end components with Made In the USA brass fittings and a high end check valve made in Italy that resists chemical degradation, gumming, and blockage while also being easy to clean if needed.  

- Eliminates boost leak caused by aged, worn, or clogged OEM check valve by replacing it with a high quality, high heat resistant cone-style check valve utilizing an NBR seat. 

- Solves for loss of crankcase vacuum caused by stuck/clogged OEM check valve.
- Solves boost leak, loss of power, poor fuel economy, and oil consumption caused by missing OEM check valve
- The new external check valve is easily accessible for cleaning, and can be replaced for $15
- Stops oil consumption caused by missing check valve. Oil consumption will cause carbon build up on the piston crown and ring lands, which can cause detonation and piston damage.
- Much longer lasting valve than the OEM check valve due to more robust design.

Check out the original discussion thread, containing over 50 pages and 250,000 views, where this PCV fix kit was initially sold and reviewed: 

Review the installation instructions below to understand how this kit is installed. Note: you need a way to drill a 9/16" hole in the bottom of the intake manifold. I offer a step drill bit as an add-on option to your PCV fix kit order if you don't already have one. 

V1 vs V2 PCV Fix Kits

I have two kits available for fixing this PCV system. Both of these kits have been thoroughly road tested. I'm currently using the V2 kit on my own car. The principle behind them is the same, but the execution differs. I will outline the differences here: 

V1 Kit: This is the original PCV fix kit. This kit routes the PCV gas through a check valve into a BNR throttle body spacer. Because this kit requires a throttle body spacer, it is more expensive to use if you don't already have the spacer. However, those who already have a BNR throttle body spacer, or want one for other purposes will find the V1 kit cheaper by $10. One benefit to this kit is that the check valve can be removed for inspection or cleaning by disconnecting the throttle body spacer, which doesn't require intake manifold removal. 

V2 Kit: I designed the V2 kit to reduce the cost of this fix. Instead of returning the PCV gas to a BNR throttle body spacer like the V1 kit does, this kit uses a special brake booster tee connector on the intake manifold itself. While the adapter and some components add to the cost of the kit itself, the V2 kit saves you $45 as you no longer need to buy a separate BNR throttle body spacer. The only drawback is that the check valve cannot be easily removed for inspection without pulling the intake manifold itself, and the brake booster tee may need to be cleaned every 2-3 years. However, the check valve is extremely robust and over-built for this application, so service of the check valve shouldn't be needed for well over 50,000 miles, if ever. The V2 kit is also easier and quicker to install and does not require the inch-pound torque wrench you need to get the throttle body spacer and throttle body back on. 

Instruction Links


V1 Fix Kit Installation Instructions

Intake Manifold Removal Instructions

Refer to the thread on for instructions on removing and reinstalling the intake manifold: 

Chevy Cruze & Sonic 1.4L Turbo PCV Issues

Having trouble with your Cruze PCV system? Check out this video to understand how the system works, what the common trouble spots are, how to diagnose them, and how to resolve them.