06-07 LBZ & LLY Duramax Powertrain
I have an 06 LBZ which at 1300 rpm makes a hissiing/sucking sound.
It does not make the sound at 1350 or above or at 1250 and below.
I had it in to GM and they replace a tube which I couldn't get a description on and that was supposed to fix it. Well no fix and sound still present.
One of the...