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Do 2010 Silverado's use vaccum lines anymore?

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by alkaspeltzar, Aug 15, 2011.

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  1. hotrodking86

    hotrodking86 Rockstar 100 Posts

    What's your deal? Simma down, the guy has a question and he's looking for an answer.
  2. travisn

    travisn Rockstar

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

    alkaspeltzar Member

    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?

    Last edited by a moderator: Dec 2, 2011
  4. travisn

    travisn Rockstar

    That might be are there has to be a way for the steering column to get from the cab to engine bay.
  5. mthomas

    mthomas Rockstar

    your engine does not develop vacuum at high rpm's
  6. alkaspeltzar

    alkaspeltzar Member

    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!.

  7. travisn

    travisn Rockstar

    Nice! Glad to hear you've sorted the issue out.
  8. chaz1

    chaz1 New Member

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


    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?
    Last edited: Dec 2, 2011
  9. ChevyFan

    ChevyFan November Beard Grower - Cancer Fighter Staff Member 5+ Years 5000 Posts

    glad this got fixed for you!
  10. alkaspeltzar

    alkaspeltzar Member

    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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