Solenoid Testing - DV solenoid leak into vacuum chamber above 0.6 bar - Hyundai Genesis Forum
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post #1 of 11 Old 12-29-2018 Thread Starter
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Solenoid Testing - DV solenoid leak into vacuum chamber above 0.6 bar

Hello

I'm in the process of boost leak hunt (BK1), and i just noticed odd thing about the DV valve solenoid - it basally leaks boost into the vacuum chamber > and intake.

Check the video bellow (stock oem solenoid, leaks above 0.6 bar), if my thinning is correct IF you go WOT for a bit longer time the leak will basically fill out the vacuum chamber (no longer vacuum )

https://youtu.be/hlHZa5wZJZc


That means the BOV / DV valve ran form the solenoid will react slower as the vacuum chamber needs to be 'vacuum-ed' out firs - correct?


Can anyone perform same test on theirs solenoid if it leaks from the turbo side? I have a feeling that hundai just used parts bin valves and the DV one shouldn't be used there (meaning ALL stock new or old will leak like this as its just the small coil spring holding against boost)

This is a small issue (not a real boost leak tbh...) but it kind of defeats the propose of having a vac chamber in the first place
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post #2 of 11 Old 12-30-2018
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Just another reason to completely bypass the solenoid.

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Idk. i kind of want to keep it for now

Solution to this would be to add another solenoid between vac chamber and DV solenoid.
From electrical point of view, run them parallel - so when the leaky design valve closes you also get a proper seal to vac chamber from a 2nd solenoid

Just a question if the higher miliamps load wont burn up something in the ECU
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Originally Posted by Pchelka View Post
Idk. i kind of want to keep it for now

Solution to this would be to add another solenoid between vac chamber and DV solenoid.
From electrical point of view, run them parallel - so when the leaky design valve closes you also get a proper seal to vac chamber from a 2nd solenoid

Just a question if the higher miliamps load wont burn up something in the ECU
Look for an industrial type solenoid valve. Or buy a new OE.

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Look for an industrial type solenoid valve. Or buy a new OE.
Thanks

By the way i just got a PVC valve from the dealer - new part newer used, and it leaks straight of the bat (tested with a hand pump)...

I'm just wondering if a light leak is normal for these valves (they leak by design) or did i get defective one form the dealership ???

I presume there should be no leak at all through this PVC, correct?
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It should not leak if blowing back into the engine.

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It should not leak if blowing back into the engine.
Dead on arrival then, ill see if they will get me working one - although Dealerships in Poland are just bad
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The metal ones all look alike but work different. Is the old one leaking too? I'm still on my OE at near 100k miles but have taken it off a couple of times and blown some carb cleaner through it.

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The metal ones all look alike but work different. Is the old one leaking too? I'm still on my OE at near 100k miles but have taken it off a couple of times and blown some carb cleaner through it.
Yes both of them leak into Crank case (old on the engine and new on my desk). To be honest it looks like bad quality from the factory not a failure.

They do try to seal but its just bad and i can blow through them with no real effort

I also tried a hand pressure pump to get some higher PSI hoping it would seal under a bit of pressure - but same it leaks. Ill try a compressor just for giggles in the morning - but as said looks as bad quality parts.


Guess for the time being i need to find some universal PCV and just splice it in there
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You can take it out and just let it vent to atmosphere. Plug the intake nipple.

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Ok just to follow up on the PCV leak story

So i went to the dealership to return the part i bought as a warranty - they send me a 3rd OEM PCV valve... This time i went there with hand held pressure / vacuum pump and tested this in front of the dealership

Guess what - 3rd valve is dead on arrival

This time i told them not to bother and instead got a industrial type

- Opens on 0.2 vacuum
- Holds anything i can throw at it


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