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Discussion Starter #1
2010, 5.3L Silverado 4x4 ~26,000miles

hey guys, the reason I am asking is becuase when driving, especially pulling, I can hear what reminds me of a vaccum leak or very faint exhaust leak.

I have had this pesky sounds for about 10,000 miles now. I have looked at the exhaust manifold and connections in the exhaust. I see no signs of leaking. Yet the noise still persists. Lookin for anyone with similar issues or problems that might have a suggestion.

PS: Could be noise from enigne in general. I have check rubber boots in firewall, but that doesn't mean i am missing something.

Please let me know if you can help!
 

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Dude, you made basically the same thread on the same day about the same issue. It should be under warranty so have the dealer look at it. That's why you paid too much for a new truck, right?
 

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Discussion Starter #3
Yes I did two posts, since there were no hits on the first thread, I thought I could describe it a second way.

And obviously I can go to the dealer, but after hearing for the tenth time, " I don't here it or I can see anything or just drive it till something worse happens" that gets kinda frustrating.

I can see no one else can think out of the box to help solve this either. Guess I will keep harassing the dealing and look elsewhere for help.
 

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For future reference you can just use the edit post and bump the thread (by adding a new post) or just add another to that same thread re-explaining it. You will get a lot of sheet on other forums, this one seems to be a big cluster so no one cares or notices.

If you legitimately think its a vacuum leak you can use a smogger. Fill the intake system with fog and see any leaks. Then you can also fill the cabin with fog and see where it leaks out. Never done the latter but it should work. They also have radio frequency emitters/receivers that do the same thing.

You will probably just have to deal with it. You gotta remember you are driving a truck, not a luxury vehicle, it will have creaks and whistles that are unavoidable for the most part. Or trade it in for a different truck.
 

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a vacuum leak will make the truck run rough

---------- Post added at 01:27 PM ---------- Previous post was at 01:20 PM ----------

also is you go from a standing start step on the gas and go for about 2 blocks while the truck is still under acceleration.If you hear the noise it is not a vacuum leak because the engine does not produce vacuum in that driving range
 

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Discussion Starter #7
Noise solved

You guys were right, it is the brake booster. Took it in the the dealer, we got it to do it quite loudly. he had me acceleerate hard and the noise would go away, hence like you said no vaccum at that point.

He also had me get it to create the noise, and lightly tap the brakes, sound goes away.

Direct proof the brake booster has an internal leak. Going back in a week to have the part installed and such. Glad you guys where there to point me in the right direction. Man, this noise was driving me crazy.
 

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Discussion Starter #9
Still sounds like a vaccum leak

Had the booster replaced, still makes the vaccum leak/exhaust leak whine. Frustrating.

Say, can someone tell me if this is normal. When the truck is slowing itself against the engine, with higher rpms(This condition would be like coasting with you foot off the gas when towing a trailer), that is when I hear the noise the most.

IS that just the engine/exhasut making a normal whine becuase there is load against it, like downshifting?

Maybe someone can listen to theirs and tell me what they hear.

Thanks again.
 

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Being that you have been to the dealer regarding the concern, I would like to set up a case for you. In order to do so, I will need your name, address, phone number, VIN, current mileage, and dealer name sent to me privately. Thank you in advance.

Tricia, GM Customer Service.
 

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Dude, you made basically the same thread on the same day about the same issue. It should be under warranty so have the dealer look at it. That's why you paid too much for a new truck, right?
What's your deal? Simma down, the guy has a question and he's looking for an answer.
 

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I still have the same issue, notice a vaccum leak sound at higher rpms. The booster is good, brakes are good. I am running out of ideas. Exhaust was tested with smoke, all looks good.

I wonder if it is not an exhaust leak or vaccum leak? I had an old car once that had a rubber boot out of place on the firewall, lots of noise came through. Could something like that be happieing? ANy suggestions where to look?


dude you obviously didnt read the tread. I ended up helping him out. you sim.sim.sim.simsimsimsima donna.
 

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Discussion Starter #16
I have tightend down all the bolts and check all the rubber boots of things entering the firewall. Everything from the parking brake cable to the steering shaft boot. I found the cover to the steering shaft to not be snug, which could have been allowing the noise. Things are finally sounding better.

I Have talked to the dealer and also taken a couple news ones now for a drive. I think because of the V4 cylinder mode runs on the driver's side, along with the big empty space, I think more noise is hear on the drivers side. Seemed to be consistent with the 2011 I took for a drive.

THings have been good, so lets hope it was just that!.

Thanks
 

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Same sound on 2011 5.3 when truck is lagging from 4 to 8 cylinders

I have tightend down all the bolts and check all the rubber boots of things entering the firewall. Everything from the parking brake cable to the steering shaft boot. I found the cover to the steering shaft to not be snug, which could have been allowing the noise. Things are finally sounding better.

I Have talked to the dealer and also taken a couple news ones now for a drive. I think because of the V4 cylinder mode runs on the driver's side, along with the big empty space, I think more noise is hear on the drivers side. Seemed to be consistent with the 2011 I took for a drive.

THings have been good, so lets hope it was just that!.

Thanks
alkaspeltzar,

My truck "hisses" in 4 cylinder mode. I can feel the truck struggle to keep speed. The mph start to drop a bit, it growls, then "bump", it jumps to 8 cylinders and the hiss is gone. It is a very similar sound to a vacuum hose leaking.

GM's M.O. is to give you a "like" vehicle to test drive and if you say it has the "same" issues, they will not attempt to correct it. This is documented by GM regarding widespread driveline issues with the newer 5.3 liter six speeds. That doesn't mean you don't have a unique issue, it just gives the sales manager an "out" and keeps GM from having to pay the dealer for warranty issues.

Were you offered a ride in the "new ones" or did you ask the dealer to drive one for comparison?

What did they say after you drove the 2011?
 

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glad this got fixed for you!
 

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Discussion Starter #20
In a nutshell, this is exactly what i do hear:

"My truck "hisses" in 4 cylinder mode. I can feel the truck struggle to keep speed. The mph start to drop a bit, it growls, then "bump", it jumps to 8 cylinders and the hiss is gone. It is a very similar sound to a vacuum hose leaking."

I thought i was hearing it at higher RPMS, but that was just engine/induction sounds I believe most cars have at higher speeds.

I dealt directly with my technician and sailman. I took one for a test drive without either present. THe 2011 i drove sounded the same, that was my opinion. But i never told them that since i was/still expecting an explaination of the present sounds.

Supposively, there is a ticket into GM with the issue.
 
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