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PCV Glove Test: Passes at idle, makes a big balloon under load.

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PCV Glove Test: Passes at idle, makes a big balloon under load.

Post by jmorman » Fri Jun 21, 2019 8:19 am

I’m getting ready to work on the car for a three day weekend (fingers crossed).

Have a bad oil leak around the front of the engine. Timing belt is oil soaked, oil on cam cover. I believe I have everything I need to do cam seals, water pump, timing belt, tensioner.

This morning I began wondering about the PCV. I do the glove test over the oil fill hole every few months just for fun and it always sucks in. I saw another test where you put a hose in the dipstick hole and run it into the car. You tape your glove on the end of the hose and drive it.
So after my 38 mile drive home I hooked up a good length of hose and managed to get it through the hood and into my car without crimping it off. Drove around town to test that it was sealed and headed three miles out of town driving 55. Glove still completely collapsed.
Thinking it still passed the test, I turned around and when I punched it back into the road the glove blew up big. Once I got back to cruising speed it collapsed again.
I’m glad I found this but ironically on a Friday with no hope for real parts for days.

What is this telling me and what do I do?

2000 S70 GLT SE

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Re: PCV Glove Test: Passes at idle, makes a big balloon under load.

Post by abscate » Fri Jun 21, 2019 9:45 am

I only know the benchmark glove on the filler cap, tested both at idle and at light revs.

Its plausible the distick could have pressure during boost or acceleration and then return to vacuum.


When was the PCV last serviced and at what miles? If you have 150k+ on it, you should be doing that to protect your new cam seals anyway...
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Re: PCV Glove Test: Passes at idle, makes a big balloon under load.

Post by Klausc » Fri Jun 21, 2019 2:14 pm

Your car has a turbo. The turbo increases manifold pressure and the glove inflates. The glove test is only for idle use, preferably on a warm engine.
If I had a larger garage, I could have more Volvos.

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Re: PCV Glove Test: Passes at idle, makes a big balloon under load.

Post by tardcart » Fri Jun 21, 2019 4:35 pm

second Klusc, you are fine.

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