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Old 03-10-2017, 09:37 PM   #1
Cobytm
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2008 Astra XR
Default PCV Valve

Having some issues with my Astra, one being that today when my dad and I were looking at the engine trying to figure out a noise. We took off the oil cap and the idle changed to being really rough and the car nearly died. Doing some research on this pointed to PCV valve but I can't find anything about one being on the Astra.

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Old 03-10-2017, 10:11 PM   #2
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2008 Astra XR
Default Re: PCV Valve

The PCV Valve is built into the valve cover. There are a couple of post on here that go into detail of some of the symptoms on why it might need to be replaced. I found the part to be a bit expensive so I tried cleaning it with a intake cleaner and can report that it appears to have done the trick. I no longer get rough idle and power drops.

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Old 03-10-2017, 10:20 PM   #3
Cobytm
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2008 Astra XR
Default Re: PCV Valve

Thanks for the quick reply, I'll look into that. Thinking the source of this "clicking" sound is coming from there as well so might knock out two problems.

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Old 03-10-2017, 10:29 PM   #4
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2003 L-Series 3.0L Sedan
Default Re: PCV Valve

1-Astra's may not use pcv valves as its old school technology. When car makers decided to reduce parts count, pcv valves became obsolete by simply designing or using existing passages in the crankcase and cylinder head(s) to allow crankcase gases to flow naturally from the bottom of each cylinder thru the crankcase to cylinder head and ported to the intake manifold or throttle. Since the intake manifold and throttle generate vacuum, porting positive crankcase pressures to a vacuum port eliminates the need for plumbing (pcv valve and hoses). L300's do this and I suspect Aura's, Vues, Ions and Outlooks too. If you are in doubt, try rockauto or other parts distributor and look up parts. GM parts online is one source of OEM parts too.

2-Positive crankcase ventilation relies on a closed engine - the engine block is sealed with the oil dipstick and oil cap the only two places for crankcase gases to escape if the dipstick tube seal or oil cap is left loose. All engines create positive crankcase pressure by way of inefficient piston rings never fully sealing against the combustion pressures generated during each combustion event. A small amount of blowby gases leak past every piston's set of rings, altogether creating positive crankcase pressures. These gases are channeled into the pcv valve with vacuum from the intake manifold drawing in gases for recycling. Opening the oil cap with an idling engine simply allows these gases to blow out while the vacuum allows more air into the intake manifold, lowering idle rpm. put the cap back on and everything returns back to normal idle.

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Old 04-24-2018, 07:56 PM   #5
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Default Re: PCV Valve

I think the Astra has a PCV valve inside the valve cover. This does not seem to be a frequent fail item but the individual part is not sold by GM. Found this $25 part from a US supplier via some postings on the Euro forums

https://vanos-bmw.com/diaphragm-valv...-z16xer-z18xer

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Old 03-06-2019, 02:12 PM   #6
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Default Re: PCV Valve

Just wondering how this worked out for you?

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Old 03-09-2019, 11:13 AM   #7
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Default Re: PCV Valve

These notes might help people diagnose bad PCV valves:

- Customer complaint about whistling noise from engine, sometimes P0105 (Map sensor) and P0170 (fuel mixture) set in ECU.

- Cracked air pressure membrane inside the cylinder head cover.

- Improved parts have been implemented in production as of engine no.: 20MV7706 (13-Oct-2008).

- In case of customer complaint remove the oil dipstick or oil filler
cap. If whistling noise disappears replace cylinder head cover. For
variants with map sensor it's also possible to check the manifold
absolute pressure with the Tech 2. During idle and without load it
should be between 32 - 38 kPa.

https://workshop-manuals.com/vauxhal...istling_noise/
___
A different problem summarized here:

https://workshop-manuals.com/vauxhal..._sealing_ring/

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