Buyer BEWARE: 2019-2021 Silverado Oil Catch Can - LOUD Hissing

Trying to fix the OBNOXIOUS Oil Catch Can on my 2020 Silverado Trail Boss (5.3L Z71). The CATCH CAN WORKS AMAZING, just annoying as heck.
If you have the 5.3, most of the trucks (or Tahoe/Surburban) will make a loud hissing noise. We've tracked down where the noise is coming from and finally have peace of mind.
Check out the installation here: • Silverado Oil Catch Ca...
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[@Carl_Jr]

The noise you're hearing is probably coming from inside the can. It's acting as a megaphone and the noise is radiating into the hose. If you put some sort of a defuser in the can it'll dampen the noise. Try stuffing the can with a Brillo pad (steel wool).

[@davidcarlucci6281]

I don't know if you have already solved this noise issue due to the age of this video, I have solved mine. I used hot water pipe insulation which comes in a couple of sizes. You can get it from a hardware, Home Depot or Lowes. Just like the original hose had a dense foam cover that reached from end to end right up to the plastic end cap. I wrapped my hose and used black duct tape to seal the slit in the insulation. The foam insulation is dense and black and looks original. Due to the high vacuum level travelling through plastic and rubber, it causes resonance which sounds like a leak. That's also why chevy added a cover over the plastic intake manifold to cut down noise. Hope this is helpful.

[@MonicaSilva-ej6cu]

I installed the JTL 3.0 on my 2019 Chevy Silverado K1500 RST 5.3L, and I was able to get rid of the air noise by using Self Sealing grey foam tubing 1/2 C 3/8" the one they use for the home air conditioners. I wrapped it with High Temperature insulation tape, and I have no vacuum noise or hissing noise, just the engine.

[@rashad-tm4zm]

Customer shouldnt have To fix jlt part. I had same problem with 3 of them. Ended up putting stock hose back on no hissing and got my gas mileage back!

[@ls5454ss]

At least I'm not the only one who thought they had a leak. I even changed the hose and fittings to find the same issue. Thanks for the sanity check! The can is great, and would buy again, but it would be nice if they mentioned this in the instructions so people like you and I don't think that there is an issue

[@masmls02]

Not trying to rub it in BUT I bought a $20 catch off Amazon and I didn't use the hose that came with it because they are super thin and a lot of reviews said buy different hose and went to the local auto parts store and got either transmission or fuel hose can't remember but the $20 catch can and hose's I bought work great don't have the hissing sound . So for $27 for my catch can I'm feeling really good .

[@tancheonghua]

I had a similar issue with catch can which i did for my ride, what i did was to put a hose clamps at the fitting near the catch can. The hissing stop, as vacuum leak from there, you might want to give it a try. Hope it solve your trouble.

[@stevenstair1068]

I put one on last year in my Silverado and they work awesome I empty crap once a month out of it...my 5.3 is perfectly quiet

[@viahj]

You'll never hear it under full throttle. Problem solved. No need to thank me, LOL. I took delivery of mine last Thursday. 6.2 with factory performance exhaust & CAI. Now, at the end of the 1st weekend I have everything bolted on (steps, bed cover, Valhalla molle panel w/hi-lift mounts, and little things here and there) and just need to install my Pulsar LT and hard wire my radar.

[@BasementBrandon]

Something still seems off. Was hesitant to buy this bc I saw your video first but decided to give it a go anyways. Can report I just put this in my 2021 5.3 Trail Boss and I have no hissing.

[@ericahearn9604]

same here

[@geissjr]

Same. No issue on my 2021 either.

[@jameshawkins7948]

Mine has a hissing as well. Not too loud but there. I really can’t tell it with the hood closed with a 10 flow master.

[@lulop022882]

Anyone know the size of those PCV quick connects..I can piece something for way way less 😬

[@Rctreadaway]

Guaranteed he cut the o ring

[@Zach_CB]

I almost ordered a JLT… ended up getting the new GM Elite Engineering catch can. Steel braided lines and amazing quality

[@jeremywhittington7605]

Had mine for a while, literally got back from Texas two days ago(I live in Ky), with a side trip to New Orleans, all in all about 3,000 miles(about 5000 total with catch can), and no hissing so far. I would suggest getting a better quality hose, or getting some carb and choke cleaner, and spraying around the hose(listening for changes in rpm, and looking for spray being sucked into anywhere that might be leaking).

[@TM-jw6kl]

I just put my JLT on a 2021 5.3. The hiss is pretty loud. I confirmed I don’t have a leak. My solution: disconnect the small side, slip rubberized armaflex over the line, cut to length and reconnect. 3/8” ID armaflex, 1/2” thick. It is hardly noticeable now.

[@td-3734]

Spray down the low side with some water/soap to see if there is a leak, super easy to do.

[@juanpujol2082]

Not leak the noise is inside the can

[@twomontess]

Great ! I just got mine. Guess I’ll be returning it before i even install it

[@Chief74]

I think what it comes down too, is since there are no leaks in the hoses ect., the noise is being made by the air flowing through inside the system itself. Diffusing the airflow much like the screen in your faucet diffuses the water flowing out, could eliminate the hiss. But why some TB owners have it, and others don’t, is a mystery. My TB it’s definitely getting one.

[@aaronlegath1220]

I have a 2019 RST with the 5.3. I installed the JLT 3.0 and have the same noise. I have 1,000 miles on it so far, no check engine lights, no issues other than the hiss. JLT told me that it was a common noise too

[@jonathangalvan9199]

I just install mines and it’s a 5.3 as well and it hissing as well

[@pattfam5663]

It's the added pressure from having longer hoses and lines. What your hearing is the air running through the lines.

[@opprometheus]

You can buy EPDM rubber-based elastomeric pipe insulation up to 1 5/8" diameter. With wall thicknesses of 3/8", 1/2", 3/4" and 1". It can withstand temperatures between -297° to 300°F. You could use that and if you wanted to, wrap that with the tape. If the hiss was coming from the hose, that should hide it.

[@skunkedfishing7868]

What ended up working for me was wrapping tape snuggly around where the short side fitting connects to the rubber hose closest to the engine. I found out it was bleeding air out of this connection hence the hissing sound for me. This was also evidenced by oil puddling at the connection to the engine on the short hose.

[@stevena.9919]

Check the 90 degree fitting the hose connects to on the catch can. I bet it screwed in to far and close to making contact with the inside of the can itself.

[@neilbeni7744]

Your spot on for me dude !! When I checked the gap was so mall it was less than the hose itself.. 👊Cheers 😂

[@Jagman2919]

I feel bad for you that the hissing didn’t stop. I don’t think you should have to settle with the hissing sound. I say ditch the JLT and find another manufacturer’s catch can. Maybe another company has one with a super insulated hose that would contain that sound. Your always going to know that sound is there. Never settle.

[@skeeter085]

Wow, I’m surprised JLT didn’t give you a discount code for all of us who just purchased the catch can after watching your review on it last week

[@kcsrr15]

I've had the JLT Catch Can for about a year now and no problems. I change out the cup every time I change my oil (3500+/-). The "hiss," does not bother me. I cannot hear anything from inside the cab while driving nor walking around the truck w/ the engine on. System works for me (2020 Chevy Silverado LT, 5.3v8, crew cab).

[@GlockPunisher1]

ADD W1 catch can on my Chevy and it works solid without the hissing sound. If there isn't a leak on it I'm stumped. I would probably replace the pcv

[@cbrmike67]

I can second that, ADD W1 is solid never any issues I only replaced the worn out O ring .

[@wyattsexton7083]

You shoulda put the extra tubing hose you added on the top - not the bottom.

[@jeffhurley3548]

That’s why I went with upr braided lines

[@toddjohnson7787]

I said the SAME exact thing! I also went with UPR because their products are just simply better!

[@dunitman]

I don’t understand this man. I have a 2019 Custom Trail Boss with the 5.3 AFM and 6 Speed Trans. I installed the exact same JLT catch can and mine is making no such noises. It’s just as quiet as before i installed it. No hissing or anything. It works great and I’m 100% satisfied with it. I don’t understand how you are having this issue.

[@ericahearn9604]

same here

[@LonestarHawaiian]

Continues to be a mystery

[@jdp1956]

Just installed the same separator and I have that hissing noise but I'm really not picky and don't mind as long as it's not a leak. My buddy wrapped his with HVAC armaflex and it worked very well.

[@cuznaka35]

What if you put the insulation on the top side of hose instead of underside ?

[@c.valley5572]

My '22 Trailboss 5.3 has JLT catch can and I'm happy to report, no hissing for me. "Yay!"

[@rashad-tm4zm]

I had same problem out of 3 of the JLT catch cans. I loss hella gas mileage and ended up sending it back! The peace of mind of no loud ass hissing! Fitting quality garbage! JLT needs to fix that before they sale anymore!

[@silverfox401]

Same here lost gas mileage to big time sent it back went with a Tracy Lewis catch can . The JLT is only catching 30% of what it needs to can is to small and no one way valve to keep it from being sucked back into the intake if it gets to full

[@rashad-tm4zm]

Please let me know how it goes. Any mpg lost or loud ass hissing. Im still looking to get another catch can

[@bobbytbone7571]

Maybe I’m wrong but I thought the catch can is supposed to be one side at the pcv on the manifold and the other side at just under the throttle body not the valve cover. Typically there’s a clean side separator that connects both valve covers together and a separate valve off the oil cap.

[@Rocknkrizz]

Use foam pipe insulation like they do in plumbing.

[@damienfauolo6613]

I bought my catch can off of Amazon believe the brand is UPR that one works great & no noises whatsoever

[@toddjohnson7787]

I went with UPR as well! That’s because we have braided Continental hoses! 😎

[@matt-luis]

I have a 2020 6.2 and it hisses too. JLT told me it was normal… 🤷🏽‍♂️

[@mikederbyshire3202]

If you spray carb cleaner on the fittings and the engine idles up you have a vacuum leak - idle stays the same no leak. Just make sure the engine is cool when you spray the cleaner.

[@ramonmuniz9676]

I think that the hose size is a bit small on the inside thats why its hissing catch can is like starving air i think if u can get a bigger (id ) hose and neck it down to the inlet of catch can and the other end that hooks up to ur engine that might get rid of the hissing sound i think the jlt hose is a bit restrictive

[@hunterharness]

Maybe try some shop towels like the blue ones and wrap up that hose and tie or tape it on That would not harm anything of you kept it tight and even quiet it more! That’s what I would do And maybe double over the towels to thicken the noise blocking

[@qck57594]

Can you cut off one end of the original hose and adapt it to the can? Why don't they design that leg with the same insulation as the mfg?

[@nissansx200ve]

It sucks but what if you use the original hose and cut off the end that connects to the catch can ?

[@daltonbarcia9216]

Put a hose clamp on the end of it. Should stop the hissing!

[@CrustyAbsconder]

I think the manufacturers of the catch-can, could make a 60 degree metal-tubing bend coming out the sides of the can. It would appear quality of construction is a major aspect to look for in a catch-can system. I do not believe the interior of the catch-can needs such a dense filter. You probably only want to catch 80% of the crud, in order to not impede air-flow. I would think those things would need a check-valve to prevent any kind of back-flow. Also one hose needs to be bigger diameter than the other. That is simple thermodynamics.

[@jakethomas_419]

The instructions for the oil separator actually mention the hissing sound you’re speaking of. Says it’s normal.

[@ramondelgado5260]

Just binged every OG interior rebuild. Love the videos I honestly thought of doing something similar with my even older service Air Conditioning truck (2006 GMC Sierra 2500hd 6.0) and you made it seem that much more fun. Look forward to more vids! 🇺🇸

[@LonestarHawaiian]

I appreciate it! Hopefully it provides a little motivation 🤙🏽

[@christopherwillingham2825]

@@LonestarHawaiian hey man love all the videos. I installed my catch can this morning and the vacuum leak you talked about before, I had that. The clips clicked into place and with the engine running, my engine started bogging down. Did you have the bogging down while sitting?

[@52scribe]

Perhaps a length of hose, placed into your ear with the other end moved around the suspected area, would help isolate the source of the hiss. PS, I have a 2019 High Country with a cold air breather. Love these trucks.👍🏾

[@jaypiva1951]

My UPR catch can system doesn't hiss. I've had it on my 2018 6.2L and now my 2021 6.6L gas.

[@toddjohnson7787]

I also have a UPR catch can setup! We have thick braided Continental hoses that’s why. 😎

[@JoshHookerJoshhook123]

If you’re concerned about a vacuum leak, check your fuel trims with a scan tool. The gm’s will set a lean code pretty quickly (couple miles) if it’s infact lean.

[@johncryer7891]

I had a similar issue with my ‘21 RST 5.3. Ended up being an unseated o-ring. No hissing now.

[@saintnificent5532]

Put a longer tube. Mount the CC somewhere else. I prefer mounting CCs at the lowest point possible in the engine compartment, (Think Gravity!). Oil Pan Level! You also *might lose the hiss with a longer tube!

[@_tclifestyle4597]

JLT Catch Can- 1 LH- 0

[@mikewessinger5285]

I have the same catch can on my 2020 5.3 RST and do not have this issue at all.

[@jordanhendrickson1484]

Sounds like it’s leaking maybe a hose clamp will help. ?

[@ivansotelo8163]

I got the same issue on my camaro 13 ss elite engineering catch can.. my sounds like hybrid... .wonder if I should change the hose..

[@rickyniver9591]

I know it was posted a year ago. Mine does it too. The catch can hoses were smaller in diameter than the factory pcv hose. What im planning on doing is finding hoses and fittings that match the diameter of the OEM hose size.

[@naterice482]

So is jlt saying the hose is fine? I put one on just now and mine makes that noise but its not coming out of the fitting at all. Also my pcv hose isnt insulated, its a semi-hard plastic. I was assuming the noise was becaude of adding the catch can. Instead of the sound just going through a hose, now it flows in from the short side, the sound is amplified by the can itself and then goes through the other side. Any other thoughts?

[@paulhedberg__]

Have you tried another catch can? I have 13k miles on my JLT and have never heard a hiss.

[@billymz28]

I would try hose clamp on each side of the hose.

[@andysullivan7226]

I just installed the J&L 3.0 on my 5.3 and put 1/2 x 1/2 armor flex on both hoses that's used on hvac copper pipe, no noises what so ever. It was tight but I slid the armor flex on to the hoses before install just for some insurance.

[@randyng-a-fook1695]

I know that this is an old video and you may probably have sorted this issue out, but may I suggest a steel braided line that covers extruded PTFE. Example from Earls Performance Products. Continue the great videos buddy and hope you are having a Happy Christmas Holiday

[@amaraltv1401]

Steel braid the hose should help.

[@jamestrantham3860]

Have seen this before, it is most likely your oil fill cap. Take the oil cap off and see if it stops.

[@Pepecoin123]

Thanks helped for mine bro

[@anonymouse2247]

Hey bud, what’s the oil fill cap? My line is hissing on my 6.2l. Thank you in advance.

[@jamestrantham3860]

@@anonymouse2247 The cap on your valve cover to add oil to your engine. If it stops hissing when you have the oil cap off, you need a oil cap with a breather.

[@anonymouse2247]

@@jamestrantham3860 yeah okay, I’ll try in the morning. Didn’t even know you could get breathable oil caps. Can oil spray up into your engine bay with that? Cheers N

[@jamestrantham3860]

@@anonymouse2247 I will not say it cannot but it is built for that

[@CMC61]

After watching your vid there might be a chance that where it connects to the catch can could have a problem, try using a very small hose clamp where it connects to the catch can. And see if that helps any.

[@Mike-ls7hs]

UPR Catch cans are a better system. I have one in my 2021 trail boss 6.2L no noise OEM clips on all ends and a better filler system. If anyone is here looking to get a catch can I would recommend UPR over other brands. Check out some KZbin videos on UPR catch cans and tell me I’m wrong.

[@toddjohnson7787]

Couldn’t have said it better! Finally!!!! I agree and have a UPR catch can myself. They are far more superior!

[@Mike-ls7hs]

Thanks Todd 🤘🏼

[@williamcrowder8642]

Why not just put a hose clamp on the catch can side may actually stop the hissing

[@scottcarter7046]

I think there should be hose clamps at the catch can

[@jonathanandersen5640]

Put some dynamat around the hose!

[@rhydershepherd8179]

Use heat shrink tubing to seal the hose up and when you do line the inside up with a glue or sealer, I haven’t tested it but it might do you better than the quick fix

[@jeffstevens664]

I got the K&N catch can is bigger too. I put one on the crank case breather on the other side too

[@EduardoMartinez-zh3dq]

I put add w1 catch can on my 2018 silverado and it works! No hissing.

[@markalford5406]

I’m using the catch can on the GM 6.6 it catches a bunch of crud . No hissing on that engine.

[@dalephillips8250]

Chevy issues from failing engines, water pumps etc...... I'm so glad I didn't purchase that 6.2 Trail boss that I was eyeing.

[@LonestarHawaiian]

5.3's been solid, 6.2s having all kinds of lifter issues.

[@dalephillips8250]

@@LonestarHawaiian I'm seeing videos on here of 5.3 owners also with problems and many of them commenting with engine problems. You get the best info from actual owners of these vehicles.

[@jdrames]

@@LonestarHawaiian Can confirm my 5.3 2021 is in the shop for lifter issues and bent push rod. Under 4000 miles, didn't even make it to my first oil change and getting work done. Apparently GM knows about the issue and is saying that it's due to faulty lifters for a specific manufacture date range, but they aren't putting out a recall. Just quietly addressing it on an as-needed basis which is just sad. Shop is replacing both banks of lifters and my powertrain warranty is being extended to 100K miles for free because of it.

[@pgiinc]

does that can have a filter screening inside? I think its inside the can you truck is just pulling a lot of vacum

[@kirkgarvin6831]

Hey I the same problem with my silverado 5.3 and i I put a hose Clip on both ends of it and it stop .

[@kyle_ex_why6370]

Do you have access to an OBD II scanner? Have you checked your fuel trims with the CC on versus off? That'll tell you for sure if you have a vacuum leak somewhere.

[@Allan_2002]

Maybe put the insulation on the top side of the hose first, then wrap with it with the tape? I honestly don't have a fix just kinda throwing something out with the hopes that it will work.

[@ivanchavez7207]

Do you regret not getting the 6.2 gonna get one pretty soon but don’t know if the premium fuel only is worth it

[@fearlessafx2025]

I have the 6.2 2020 rst and I like it but I haven't moded anything yet and I love the power over the 5.3 2017 I had.

[@dubltap7216]

I have a 2020 Trail Boss LT with the 6.2. it's a beastie. Traded in my 18 Silverado with the 5.3. world of difference. Premium fuel is recommended not required.

[@fearlessafx2025]

@@dubltap7216 I run premium it does feel snappier to me and seems better. Not happy about the election now that gas has gone up like a 1.50 a gallon...

[@paulhedberg__]

I run 87. Runs great and I average 16.1 mpg lifetime after 13k miles.

[@nitelyfe6648]

just got one for my 2024 high country 6.2 and it's hissing like crazy driving me nuts

[@thomasbartlett5458]

Yeah I have a 19 Silverado TB in which I installed the same catch can on mine except with the extra extension can. I’ve had it on for about 8 months now and never any hissing sounds.

[@abrlopezz]

Hi buddy I installed the J&L OSC Brand and is perfect not noise at all

[@toddjohnson7787]

You shouldn’t have to do ANY of this if JL sold better products via hoses. You should go checkout UPR’s Catch Cans. They have a way better system with thick braided CONTINENTAL hoses. You definitely won’t have that sound using their hoses. Go check them out. You won’t regret it!

[@NateLugo]

I wanted to try this but can ship to my house. I live in lame California. But maybe a blessing in disguise

[@alancushman4907]

Have you tried adding a clamp to the hose where it connects to the Oil catch can?

[@personalprivilege6992]

Great video. I have the same problem.Ive been trying to figure this out.

[@toddjohnson7787]

Only way to figure it out is to ditch this brand and go with UPR’s Catch Can setup. They have Continental hoses as well as interchangeable PCV check valves to help adjust the airflow going through your catch can. UPR also has KZbin instillation videos. Check them out!

[@mochaleui7814]

Great informational video Hawaiian and mahalo🤙

[@derricklesane3114]

I have the same jlt on my 2020 trail boss and no noise at all

[@anything_idc_]

I got a 2019 high country and sometimes when i first open my driver door a hissing noise come from the rear what is that?

[@jamesyak52]

i got a UPR one for my 5.3 no issues or hissing. that sucks

[@toddjohnson7787]

UPR is definitely more superior! 😎

[@joehansen4889]

I put one on from a different company. No noise! 2016 chevy.

[@coats3727]

Inspect the inside of the hose. I’m sure there are striations that are creating whistling. Perhaps change hoses…some oem with the same connector and just cut to length

[@dionysusgross476]

I have the 2019 Classic 5.3L and I put an el-cheapo eBay catch can on it, never ran into that hissing. I did run into it leaking a bit onto my steering column, that is still a ongoing issue

[@juanpujol2082]

I don’t like the noise I’m buy for my Silverado but I don’t think so for my G37 the noise is crazy

[@crodriguez8228]

Aloha Lonestar! I think you might still have something going on. Just installed mine today and no hissing noise to be found! Great video as always though! Keep them coming! Just a thought...a small pin leak in the hose on the catch can!?

[@juan_f150]

At 2:17 I felt that lmaoooo went from a 2012 Silverado 5.3 to an ecoboost and really just do miss that exhaust note no lie

[@jewllake]

I have the Elite catch can on my 2018 6.2 and have it mounted on the left front rad support. My hoses are pretty long and I have a very, very faint hiss. The kit uses Continental fuel/emission hose 50 PSI WP. That may have something to do with it.

[@jeffhurley3548]

No hissing on mine but I have a 17 5.3 with the a f m so.....

[@johnready630]

If you had a vacuum leak that noticable it would cause a rough idle and other performance issues. It would likely cause the engine to throw MISFIRE CODE OR THE LIKE.

[@joshuaarthur2692]

Are the catch cans needed Bc of the AFM? Never heard of these until the updated 5.3 engines with the AFM.

[@silverfox401]

I have a 2021 GMC Sierra did the same thing as your sent mine back . I had a 2017 with a Tracy Lewis catch can no hissing with Tracy’s can . Iam going back to Tracy Lewis catch can it’s expensive but way better than JLT read up on it the JLT only catches about 30% Tracy can explain it better than me

[@shaunwall1]

After installing mine on my 2020 trailboss, a few weeks went by and I’m getting a code P0449, a malfunction in the systems evaporative emissions control system (EVAP), has anyone else had this issue?

[@mrhighway]

Hey Chad, I heard those newer Chevy are having problem with lifter and bent pushrod on newer Silveraldo , Tahoe, Suburban all GM v8 engine. Had you experienced any of those systom?

[@JWolf24]

I’ve heard that too. I’ve heard people saying there lifters went out with less than 10k miles which is crazy

[@mrhighway]

@@JWolf24 I know... I was going to buy a new chevy truck but i'm scare. Might be going with Ford, because there are lots of complaint about this lifter fail on newer chevy truck.

[@JWolf24]

@@mrhighway honestly I’ve always been a Ford guy but now I don’t really trust either companies right now. The new f150s also started using cylinder deactivation on the 5.0 v8 so who knows if it will hold up anymore like it used to or have similar problems as GM. Also the new f150s all have rust problems as well as a recall for there driveshafts. Hopefully they both can get there acts together soon.

[@SiccSideKali4Nia209]

@@mrhighway i have a 2019 ram hemi with etorque no issues, the only issue i forsee are the exhaust manifold bolts aroun 100k. Nothing major. The hemi is great. Im a ram guy though lol