"Plunk" sound abour 5 sec. after ignition off

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08-22-2010, 11:05 AM

#41

Sneezy

Senior Member

Join Date: 03-22-2008

Location: Binghamton, NY

Posts: 228

Quote:

Originally Posted by MIKEYfixit

it sounds like the shop vac ball dropping inside it

That's exactly what it sounds like. Been there since day 1 and I just assumed it was a vacuum release or something.

08-24-2010, 06:46 PM

#42

CobraMike

Join Date: 02-05-2010

Location: Michigan

Posts: 5

Not Sure But...

Both my 2008 HHR SS and our 2010 Camaro RS do this when you shut them off. The Camaro is not Turbocharged so I doubt it is the wastegate.

Mike

09-26-2010, 06:07 PM

#43

Spozo

Member

Join Date: 08-11-2010

Location: House

Posts: 98

It's actually the throttle actuator cycling.

09-26-2010, 06:29 PM

#44

mongo

Senior Member

Join Date: 06-21-2008

Location: SE Michigan

Posts: 1,449

Mine doesn't plunk, but one time it hissed real loud then I realized I had parked on the cat's tail.

10-01-2010, 04:05 PM

#45

Gas Man

Senior Member

Join Date: 01-04-2010

Location: Imported from Detroit

Posts: 1,584

Mine plunks even if you never start the car, just turn the ignition key from ON to OFF.

10-01-2010, 05:30 PM

#46

moonsign

Senior Member

Join Date: 09-20-2009

Location: Hayward, Ca.

Posts: 1,058

I had the engine running with the hood up. Went over turned the engine off, and heard the "Plunk" right behind the air box. Took a quarter out, dropped it over the back of the engine, and "Poof"!, damn thing propositioned me. "Moon"

10-01-2010, 06:52 PM

#47

mrsilent13

Senior Member

Join Date: 01-21-2009

Location: Los Angeles, Ca

Posts: 138

its the throttle body plate closing

edit: my old cobalt did the same thing...and it was the 2.2...that i turbocharged....then we also have a saab 9-3T and it also makes this sound...its the electronic throttle plate de energizing