What’s this part?
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Joined: Jul 2016
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From: Middletown, PA
What’s this part?
I tried looking at parts diagrams for the engine, intake, and emissions but I can’t find out what this is? If anyone knows what it is, do you also know if it is prone to failing? Seems like some kind of check valve or something.
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From: Memphis, TN, Earth, Milky Way
You might get more help if the truck info was in your signature.
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It looks like a manifold in the vacuum or PCV system. Why are you focused on it?
(phone app link)
It looks like a manifold in the vacuum or PCV system. Why are you focused on it?
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From: Extreme South Central Michigan
Vacuum check valve. Picture shows it supplying vacuum to brake booster with a port for IWE actuator system. I'm guessing 2 check valves for more volume. Saw that on my '14 5.0 and said that's a little different. I thought at the time that 2 valves in parallel increases the chance for failure.
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Vacuum check valve. Picture shows it supplying vacuum to brake booster with a port for IWE actuator system. I'm guessing 2 check valves for more volume. Saw that on my '14 5.0 and said that's a little different. I thought at the time that 2 valves in parallel increases the chance for failure.
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Last edited by RLXXI; Jun 22, 2018 at 08:51 PM.
Thread Starter
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Joined: Jul 2016
Posts: 39
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From: Middletown, PA
Thanks for your guys replies. The only reason I ask is because when I was looking around in the engine bay with the truck running, I had what sounds like a loud air leak hissing near the throttle body and when I pinch the hose that comes out of that valve to the throttle body, it stops. All connections are tight. I was just curious as so that part and what function it serves and if air should be going through that all the time. Seems weird that there is a second source of air coming from the air box, through that valve and then dumping back into the throttle body when you have that huge intake tube to go through.
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Perception of a problem within a system one does not understand often produces false concern. If your not having any issues with performance and have no warning lights alerting you to a potential problem, it's OAD (operating as designed) enjoy the machine. 
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Thread Starter
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Joined: Jul 2016
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From: Middletown, PA
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From: Memphis, TN, Earth, Milky Way
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Air should only flow through the booster's vacuum supply line when the pedal is being released. No other time.
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