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What is this PCV-looking hose that is on the Air Intake Duct

Tiny
LINNEX MILES
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 3.4L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
I was inspecting the hoses on my car and I made my way to the air intake duct. The best way I can describe it is the PCV-looking hose that is on the air intake duct. That is above the air intake sensor and to the extreme left to the mass air flow sensor. I noticed a crack and when I went to inspect it was brittle and snapped in two.

I supplied a picture for reference. When to the local auto parts store, they have no clue attempted to reach out to local mechanic, but was not in. Please advise as to what is the part? Where can I find it? And is there a diagram to show where the other end goes?

Thanks!

Also, the opposite end was oily. What do I need to inspect? Thanks again.
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Thursday, October 13th, 2016 AT 1:38 AM

24 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It is a breather hose that goes to valve cover they get oily from sucking oil vapors to be reburned when car is running. Auto part should have it if not dealers may.
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Thursday, October 13th, 2016 AT 5:39 AM
Tiny
LINNEX MILES
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Thanks for the info! To share my discovery, the technical name for part in question is called the 3.4 LITER V6 ENGINE CRANKCASE VENTILATION TUBE GM Part Number 24508188. Well, as the parts dealer has educated me that is. Is there a diagram available that shows where the opposite end goes? The Haynes manual is not providing me much info. Thanks!
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Friday, October 14th, 2016 AT 5:30 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Hey Linnex,

Yes the tube goes into the top of the valve cover.

Best, Ken
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Saturday, October 15th, 2016 AT 12:16 AM
Tiny
JEDUNN
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  • 2 POSTS
I came across this thread searching for info on this exact hose. Where exactly does the other end connect to? I didn't realize it came loose until after I was done replacing the air filter. A diagram or detailed explanation would help, I know you said valve cover above, but it doesn't seem long enough to really reach anywhere. I also have a 2003 Impala. Here's a pic below of it hooked only to intake.
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Thursday, March 9th, 2017 AT 10:17 PM
Tiny
HMAC300
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The other end goes to valve cover so engine vapors can be sucked into engine and burned. Check both covers there should be a hole towards the air duct
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Friday, March 10th, 2017 AT 6:32 AM
Tiny
JEDUNN
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  • 2 POSTS
Thank you. I found the hole and once I figured out the proper path the hose laid between the two parts, it popped right into place.
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Friday, March 10th, 2017 AT 10:07 AM
Tiny
CHEV45
  • MEMBER
  • 4 POSTS
Same thing happen to me. The end that goes on the main air intake hose is snug. The other hole is on the engine towards the back. When I plugged the hose in the hole behind the engine, it was very loose, is this correct?

From what I understand it's suppose to be sucking up fumes from the engine.
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Tuesday, June 9th, 2020 AT 12:28 PM
Tiny
KASEKENNY
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Correct. It should not be loose because it feeds engine blow by gases from the crankcase back to the intake system.

If the valve is loose then it could cause issues. Can you get a picture of the valve and how it is loose? As long as it is creating a seal then it is okay but if it is loose then I suspect it is not sealing.

Let me know and we can go from there. Thanks
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Tuesday, June 9th, 2020 AT 2:03 PM
Tiny
CHEV45
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I was able to snag this picture of the hole on the engine that I'm referring to. I had very high idle and I noticed this end was not connected to anything. High idle stopped when I plugged it into the hole.

Is this supposed to be a tight seal because the end still moves around, it just kind of covers the hole and stays there due to how the length and how the hose is positioned. Kinda worried if it will fly out or how it was disconnected in the first place.

Thanks!
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Tuesday, June 9th, 2020 AT 9:28 PM
Tiny
KASEKENNY
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Yes. That should be a snug fit. Clearly it should just not pull out. It needs to have some resistance when removing it.

If you want me to see if I can find the part number of the PCV and tube, send me the year, make, model, and engine of your vehicle.

Also, that looks like it is just a tube or hose. Is there a valve in the end on the valve cover side?
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Wednesday, June 10th, 2020 AT 6:25 PM
Tiny
CHEV45
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It's a 2003 Chevrolet Impala V6 ( I believe it's 3.4L).

Is the valve in the engine hole or on the end of the hose?
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Wednesday, June 10th, 2020 AT 7:52 PM
Tiny
KASEKENNY
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I attached the info about this valve. The valve should be in the engine side. The valve actually seals in the engine as shown and then the hose connects to the PCV.

Take a look at this and let me know what you find. Thanks
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Thursday, June 11th, 2020 AT 6:28 PM
Tiny
CHEV45
  • MEMBER
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From your PCV diagram, I see hole lays flat for the PCV Valve (2).
If you look at my picture a few posts above, the hole is at an incline/diagonal, does that matter?
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Thursday, June 11th, 2020 AT 8:15 PM
Tiny
KASEKENNY
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No. I would not think so because those drawings are normally recycled from other engines when the components are this similar. So that drawing may not actually be of your engine but because a PCV is generally the same in all engines they don't spend the money to have a different drawing made for each different engine.
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Friday, June 12th, 2020 AT 6:29 PM
Tiny
JDMAC
  • MEMBER
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I’m currently experiencing issues on my 2003 Impala 3.4 L that I believe are coming from this hose. Like the original post, my hose snapped in two so I went to the junkyard to get a replacement hose. I got it but realized that it would not go in all the way where it connects to the engine, but I also heard this high pitched whistling noise whenever I started the car. The noise would go away when I pressed on the accelerator but it would come back in after I let my foot off the gas. Would it be from the hole from the engine and just need to be sealed somehow? Or could it coming from somewhere else?
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Thursday, November 26th, 2020 AT 7:08 PM
Tiny
KASEKENNY
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Can you get a picture of what this looks like now? Short answer is yes the noise is most likely due to an air leak. Basically when you are off the accelerator and at idle the engine is in a vacuum. Meaning there is lower pressure in the intake then on the out side of the engine. So if there is a leak due this hose not being seated or connected properly then it will be sucking air into the engine. When you get on the accelerator, it opens the throttle and it pulls air in through the throttle so it stops (or decreases the amount of air) pulling in from the leak so the whistle stops.

Let's get a picture and go from there. Thanks
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Thursday, November 26th, 2020 AT 8:10 PM
Tiny
JDMAC
  • MEMBER
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Please excuse the vertical video. But if you look at it, the hose I’m talking about has some blue type of sealant around the edge where the engine connects to it. The hose that broke off was sealed with the blue substance but I’m not sure what the blue stuff is called. Thank you for the help!
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Thursday, November 26th, 2020 AT 10:06 PM
Tiny
KASEKENNY
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Yeah, that is a high pitched whistle all right. Just put your hand down there and run your fingers around it while it is running and see if you can feel where the air is coming in. Otherwise you need to use this guide to find the vacuum leak.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Either way, I am sure that is your issue so let's just confirm it and go from there. However, I included the process to replace the PCV as I think that is where we are headed.
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Friday, November 27th, 2020 AT 2:51 PM
Tiny
JOSE CARLOS VILLATORO
  • MEMBER
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I've got a similar issue. I broke that line trying to disconnect it. Long story short I need to replace that ventilation tube but I want to know how to take it off. Do I need a special tool or can I take it off with a flathead screwdriver? I added a video and if you're able to see where I broke the line I tried to put some black tape, lol.
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Tuesday, January 26th, 2021 AT 8:36 PM
Tiny
KASEKENNY
  • MECHANIC
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If the plastic line broke then you have two options. First you can replace the molded plastic line with either a replacement line or a rubber fuel line. Or you can splice the hose back together with a rubber line. I attached so pictures of what I am talking about.

If you are going to replace the line then you are going to have to cut the metal ring as those are most likely one time use clips. Basically they are crimp clips where you slide the hose on and then you use a crimping tool and squeeze that metal ring so that it is tight on the fitting.

The replacement hoses usually come with a removable hose clamp. Let me know if you have questions. Thanks
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Wednesday, January 27th, 2021 AT 1:10 PM

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