lly turbo problem
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lly turbo problem

  1. #1
    Senior Member
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    Default lly turbo problem

    My 05 Chevy started acting up the other day. While driving down hill i start to hear what sounds like a boost leak. When I got to the bottom of the hill I hit the throttle and no go. The truck wont seem to make boost, or at least not much. After limping it home I pulled off the intake to check the turbo. No visible damage to the compressor side and no excessive play in the shaft. With the turbo heat shield removed I can feel air leaking around the turbo but I can't pinpoint an exact spot. There are two sensors on top of the turbo. I believe one is a vane position sensor and the other is the controller. If I unplug either the air leak goes away.
    Anybody ever experience this before? O ya the truck only has 18000 miles

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    check for split silicone boots to the charge pipes, the compressor output is all visible, so if it is actually leaking off boost, a spray bottle with some soap in it sprayed on the charge side while the engine is runnin will also make it show itself. if there's nothing found there, id think it was the hotside leaking and that's what you're hearing. those bolts connecting the exhaust to the turbo can back out , ive seen that before.

    Dare to be different, if it turns out great you can claim you planned it that way.

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  4. #3
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    Quote Originally Posted by IMPATIENT 1 View Post
    check for split silicone boots to the charge pipes, the compressor output is all visible, so if it is actually leaking off boost, a spray bottle with some soap in it sprayed on the charge side while the engine is runnin will also make it show itself. if there's nothing found there, id think it was the hotside leaking and that's what you're hearing. those bolts connecting the exhaust to the turbo can back out , ive seen that before.
    Its not a boot leaking, that was my first thought as well. It feels like its leaking between the two housings of the turbo down low. I can feel the air coming up but I can't get my hands down low enough to pinpoint it. Why would the noise go away with the vane position or vane control unplugged?

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  6. #4
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    Broken clamp on turbo housing. Chevy doesn't sell it individually but they did offer to sell me a new housing for $1500. I had a friend bring one home from work and it's good to go

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