Is this normal? Please help!

[kevdc77]

I've been noticing ever since I bought my 04 Yukon a loud pinging noise coming from what seems to be the exhaust. It sounds like normal heat expansion but 2x's as loud. It may just be that, but could it be something else. It only does it after the truck has run for a little bit. My other ? is, are mufflers suppose to have some sort of hole in them to drain out any moisture or is my dealer just giving me a rash of ****? I thought maybe the hole and the noise have something to do with each other? If anyone could give me some info/knowledge on this it would be awesome. That way I can either tell the tech at the dealer to shove it or just say thanks.

 

[greengumby]

I've been noticing ever since I bought my 04 Yukon a loud pinging noise coming from what seems to be the exhaust. It sounds like normal heat expansion but 2x's as loud. It may just be that, but could it be something else. It only does it after the truck has run for a little bit. My other ? is, are mufflers suppose to have some sort of hole in them to drain out any moisture or is my dealer just giving me a rash of ****? I thought maybe the hole and the noise have something to do with each other? If anyone could give me some info/knowledge on this it would be awesome. That way I can either tell the tech at the dealer to shove it or just say thanks.

There is an TSB on this issue what it is that the muffler needs a new heat shield added to the outside on the muffler . If you need the TSB on it I can dig it up and post it for you

 

[str8wkd1]

mine does the noise to and mostly all have that hole unlees its a performance muffler from what Iv seen

 

[kevdc77]

There is an TSB on this issue what it is that the muffler needs a new heat shield added to the outside on the muffler . If you need the TSB on it I can dig it up and post it for you

What is TSB?

 

[greengumby]

Thats why there is a Tsb on it ..i had mine fixed

 

[greengumby]

What is TSB?

Technical Service Bullentin

its what the dealership uses to know that there are problems and how to fix them

 

[woldd90]

Please post it...

 

[boostaholic]

Sounds like you need a magnaflow catback and some longtube headers, problem solved!

 

[kevdc77]

There is an TSB on this issue what it is that the muffler needs a new heat shield added to the outside on the muffler . If you need the TSB on it I can dig it up and post it for you

Yes please post the TSB, so I can bring it to the dealer tomorrow. Thanks much.

 

[greengumby]

Exhaust System - Popping/Snapping Noise When Hot/Idling

Bulletin No.: 03-06-05-008D

Date: March 05, 2007

TECHNICAL
Subject:
Exhaust Popping/Snapping Noise When Vehicle is Hot, at Idle, or Immediately After Vehicle is Shut Off (Replace Muffler Heat Shield)

Models:
2002-2006 Cadillac Escalade, Escalade EXT
2003-2006 Cadillac Escalade ESV
2002-2006 Chevrolet Avalanche, Suburban, Tahoe, Silverado, Silverado HD
2007 Chevrolet Silverado Classic, Silverado HD Classic
2002-2006 GMC Sierra, Sierra HD , Yukon, Yukon Denali, Yukon Denali XL
2007 GMC Sierra Classic, Sierra HD Classic
2003-2006 HUMMER H2

with 4.8L, 5.3L, 6.0L or 8.1L Gasoline Engine (VINs V, B, T, Z, N, V, G - RPOs LR4, L33, LM7, L59, LQ9, LQ4, L18)

Supercede:

This bulletin is being revised to add the 2006 and 2007 (Classic Only) model years and the 5.3L (L33) engine. Please discard Corporate Bulletin Number 03-06-05-008C (Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on a popping/snapping noise from underneath the vehicle at idle or immediately after the vehicle is shut off. Some popping/snapping noise from the exhaust system during cool down is a normal condition.

The noise may be intermittent depending on the outside temperature and or temperature of the exhaust system at the time of testing.

Cause

As the exhaust system warms and cools, the muffler and the muffler heat shield expand and contract at different rates and may cause a popping and/or snapping noise.

Some popping/snapping noise from the exhaust system during cool down is a normal condition. The customer should be made aware that this service procedure is designed to reduce but not eliminate all exhaust system popping and snapping during cool down.

Correction

Replace with new heat shield and new straps

Part # 15253526 - Heat Shield
three straps, P/N 10391259

 

[kevdc77]

Thanks, this will be a huge help. But I'm wondering because it doesn't effect driving, if they will replace it free of charge or not?

 

[kevdc77]

Where abouts do you get these TSB's from?

 

[greengumby]

i dont thinkso ...when mine was replaced i was still under the original 34k

 

[greengumby]

Where abouts do you get these TSB's from?

you can actually subscribe to some online services that do actually give you tsb's in my case i have them at work

 

[kevdc77]

It's at the shop now. I gave them the TSB w/no issues. They had to look it up on their own computer. We'll see if they do the repair or not. I'll pick it up later.

 

[greengumby]

Hey let us know what was the end result

 

[wreckless123]

So what ever happened? My 99 is doing the same thing. Like popcorn is in my exhaust manifolds!!