Rattle after deceleration

Morty

Original poster
Member
Jul 22, 2012
9
I am having an issue on deceleration. I hear almost like a valve chiming around. Almost like there is a valve in the exhaust losing the pressure and unable to stay open. Not sure if we have any in the exhausts.

This problem is really really starting to irritate me. I hear it daily from passenger side. It makes no sound on idle or if i rev up. But coming down from speed i hear it.

I have an 06 Envoy Denali. Anyone have any ideas?
 

The_Roadie

Lifetime VIP Donor
Member
Nov 19, 2011
9,957
Portland, OR
What changes a lot on deceleration is vacuum. Have you looked inside at your air filter box and at the hoses?
 

Morty

Original poster
Member
Jul 22, 2012
9
Yeah. Just cleaned my filter today. Currently running a Volant 15760 Cool Air Intake Kit. With prefilter.
 

Morty

Original poster
Member
Jul 22, 2012
9
This chiming or rattling comes from underneath the front passenger side. If the truck is put into neutral it stops, if the vehicle downshifts to 1st it stops. Just for a little more info.
 

sBoddie

Member
Dec 27, 2012
3
Sorry to hear this, Morty. Sounds like what mine started doing a few months ago before it died Labor Day. Oil levels fine, but I would get this knocking/valve rattle on decel, or right before a shift @ ~2300 RMP. Same truck as you, but 2005. How many miles on yours? Mine = 176k. See crosslink @ <http://gmtnation.com/f26/what-other-vehicles-have-compatible-5-3l-dod-6074/>

Started the full thread @ trailvoy after the motor quit completely. Was wondering why it got so quiet over there. Good to see you're posting, Roadie!
 

Morty

Original poster
Member
Jul 22, 2012
9
I have not yet checked the shields. Other then just some visual looking. I will have to take a peak.

It has around 77k miles. I do not having knocking. Its a chiming/rattle. Windows need to be open to hear it.
 

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