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Premium Member
2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
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6,221 Posts
Call your tuner?

But, definitely throttle valve. You may be able to free it by flashing stock and cycling the key a few times. With everything plugged in. Just don't go overboard. Otherwise you can open the inter cooler pipe and free it manually.
Does the tune freak out and shut the throttle valve? Because the throttle valve "fails" open. Unless you're implying it's stuck shut...which is entirely possible, based on how gross they can get.
 

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Premium Member
2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
Joined
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6,221 Posts
I thought that motor noise you hear after shutting the engine off on a diesel was those intake louvers in the front grill area? Maybe I’m wrong
You can hear the throttle valve cycling (which is a "scrolling" noise, if you will), and then the standard "squeak-squeak" noise, which is the intake manifold runner valves cycling.

Actually found this, pretty handy article. The CTD definitely makes a lot more noise after shutting down than most vehicles: Common Cruze Diesel Noises
 
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