08 4.3 exhaust rumble !? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NONHOG · 03-12-2009, 11:04 AM

Anyone have this issue ? Just curious , my Silverado "rumbles" during warm up just about when its fully warm(under load, part throttle) . 1st time I heard it I thought a semi truck was right next to me doing a jake brake.
Had it in the dealer for a couple of other warranty concerns and mentioned it.
They did not hear it but put in a section of flex before the muffler.
Because there was a TSB on it.
Now its more frequent but not as loud . Time for aftermarket cat back ?

Hoping for a cure .

billnorman · 04-08-2009, 02:01 AM

I had a rumble in my '96 4.3 one day after I went fishing. I came back to get the truck and trailer to load up the boat, and when I started it, it was loud. I looked under it and lo & behold; someone had been sawing my catalytic converter off. I guess I got back in the nick of time, I just had to re-weld it back on the next day. Thieves!! Bah humbug!!

**Palf70Step** · 04-08-2009, 12:22 PM

That would really stink. Glad they didn't get it.

NONHOG · 04-08-2009, 02:53 PM

Man that sucks, glad it wasnt worse ! Friend from work stopped by the store in and out in 5 min. Cat gone ! Like they were waiting for him.

03-12-2009, 11:04 AM	#1
NONHOG Registered User Join Date: Feb 2007 Location: Marana, Arizona Posts: 3,458	08 4.3 exhaust rumble !? Anyone have this issue ? Just curious , my Silverado "rumbles" during warm up just about when its fully warm(under load, part throttle) . 1st time I heard it I thought a semi truck was right next to me doing a jake brake. Had it in the dealer for a couple of other warranty concerns and mentioned it. They did not hear it but put in a section of flex before the muffler. Because there was a TSB on it. Now its more frequent but not as loud . Time for aftermarket cat back ? Hoping for a cure . __________________ "I feel the need for speed!"... as soon as I am done with my nap.

04-08-2009, 02:01 AM	#2
billnorman Registered User Join Date: Mar 2009 Location: glen burnie md Posts: 174	Re: 08 4.3 exhaust rumble !? I had a rumble in my '96 4.3 one day after I went fishing. I came back to get the truck and trailer to load up the boat, and when I started it, it was loud. I looked under it and lo & behold; someone had been sawing my catalytic converter off. I guess I got back in the nick of time, I just had to re-weld it back on the next day. Thieves!! Bah humbug!!

04-08-2009, 12:22 PM	#3
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,228	Re: 08 4.3 exhaust rumble !? That would really stink. Glad they didn't get it. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

04-08-2009, 02:53 PM	#4
NONHOG Registered User Join Date: Feb 2007 Location: Marana, Arizona Posts: 3,458	Re: 08 4.3 exhaust rumble !? Man that sucks, glad it wasnt worse ! Friend from work stopped by the store in and out in 5 min. Cat gone ! Like they were waiting for him. __________________ "I feel the need for speed!"... as soon as I am done with my nap.



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