02 Burb rattle noise when cold - The 1947 - Present Chevrolet & GMC Truck Message Board Network

SHORTDOG99 · 12-08-2011, 02:26 AM

I have been getting this weird rattle noise that sounds like it is coming form the trans (because it only happens when it shifts gears) but it only happens first thing in the morning when the truck is still cold. After driving a few blocks or after i let the truck warm up....the noise goes away and stays away all day long till the next morning. Kind of sounds like the Catalytic converter rattling if that makes any sense but it is pretty loud and annoying.... anybody else ever have this happen on their truck?

BlackhillsHD · 12-10-2011, 12:45 AM

Bang on the cats when its cold. I have seen some where the ceramic inside the cat will break loose inside the pipe and rattle like that. Also the exhaust mount on the RH of the trans, the rubber isolator like to pop out on those as well. Thats where I would start.

SHORTDOG99 · 12-10-2011, 12:55 PM

Yeah but i don't think it is the Cat, because if it was..the stuff in the cat would rattle through out the day. It only rattles when it is cold and then goes away once it is warm and it only rattles when the trans shifts gears. It sounds more like the Cat cover rattling or vibrating but i am counting that out too for the same reason, it would rattle through out the day...why does it only rattle when it is cold?

12-08-2011, 02:26 AM	#1
SHORTDOG99 Registered User Join Date: Nov 2010 Location: Ontario, California Posts: 124	02 Burb rattle noise when cold I have been getting this weird rattle noise that sounds like it is coming form the trans (because it only happens when it shifts gears) but it only happens first thing in the morning when the truck is still cold. After driving a few blocks or after i let the truck warm up....the noise goes away and stays away all day long till the next morning. Kind of sounds like the Catalytic converter rattling if that makes any sense but it is pretty loud and annoying.... anybody else ever have this happen on their truck?

12-10-2011, 12:45 AM	#2
BlackhillsHD Registered User Join Date: Nov 2011 Location: Rapid City SD Posts: 140	Re: 02 Burb rattle noise when cold Bang on the cats when its cold. I have seen some where the ceramic inside the cat will break loose inside the pipe and rattle like that. Also the exhaust mount on the RH of the trans, the rubber isolator like to pop out on those as well. Thats where I would start. __________________ 1970 : Chevy: K20 "Frank the Tank" 6.0 LS, 4L80E, 14 bolt, and Dana 44 1970 K5 Blazer CST 350, TH350, Np205, Dana 60 and 14 bolt General Motors Master Certified wrench swinger ASE certified Master auto tech Instructor of Automotive Technology

12-10-2011, 12:55 PM	#3
SHORTDOG99 Registered User Join Date: Nov 2010 Location: Ontario, California Posts: 124	Re: 02 Burb rattle noise when cold Yeah but i don't think it is the Cat, because if it was..the stuff in the cat would rattle through out the day. It only rattles when it is cold and then goes away once it is warm and it only rattles when the trans shifts gears. It sounds more like the Cat cover rattling or vibrating but i am counting that out too for the same reason, it would rattle through out the day...why does it only rattle when it is cold?



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