Hey, just had a question. I recently had my 2006 GMC 3500 duramax in the dealer for the recall on teh plugs.

But I started it up today and while it idles it sounds like always but there is there is the odd crackle comming from the engine. Its in no pattern just happens spuratically. Its not to loud but it just doesn't sound like a good or normal noise. Just wondering if anyone else has expirenced this.

thanks,
collin

Coming from the driver side?

yup mine is doing the same and the dealer says its normal with the high oil pressure the max is running oil is getting into the mainbearings and snapping on the power stroke of the engine thats all they can figure out sounds like they're not sure either

Mine does it too....:mad:

yep me too...i went to two different dealers and they both had two different things to say about it. one was it was the exhaust going though the manafold going back to the turbo. i told him i didnt think he was right. so i went to another dealer and they said..."yea i have heard it on a few of the new trucks , but i have no idea what it is." so any help on this would be great.

Mine does it to, and it irritate's the hell outta me! I took mine to the local dealer and they said it is a normal sound

2001-2004 Chevrolet Silverado


2003-2004 Chevrolet Kodiak C4500/C5500 Series


2001-2004 GMC Sierra


2003-2004 GMC Topkick C4500/C5500 Series


with 6.6L Duramax™ Diesel Engine (VIN 1 -- RPO LB7)


This bulletin is being revised to update the models information. Please discard Corporate Bulletin Number 02-06-01-022A (Section 06 -- Engine/Propulsion System).


Some of the above vehicles may exhibit a random ticking noise that is most audible on an engine with a coolant temperature of 70°C (158°F) or higher and from idle to approximately 1500 RPM. The noise usually is most noticeable at the rear of the driver's side front wheel well. Customers may also comment about hearing a tick noise inside the vehicle at idle such as when sitting at a drive through window. All 6600 Duramax™ diesel engines have this condition; however, some are more audible than others. Engine build variation from engine to engine contributes to differences in perceived volume. All Duramax™ engines are manufactured to very close tolerances to meet the durability and reliability standards.


This noise is caused by the relationship of the engine cylinder block, crankshaft journals, bearing inserts and the oil film. This relationship may allow a vibration that resonates through the cylinder block and is heard as a metallic ticking noise. The noise could be described as an irregular ticking or clacking sound, like random typing on a mechanical typewriter.


This condition has been present in diesel engines produced for the last 20 or more years. The overall noise reduction in engines produced today makes this noise seem new when, in fact, it was masked by other noises in the past. Many manufacturers such as Isuzu, Hino, Mitsubishi, and Nissan report a similar condition in their diesel engines. Testing and engine teardowns with this condition reveal no condition that would affect reliability or durability of this engine.


Dealers should not attempt to compare any customer vehicles exhibiting this noise with other similar vehicles as the noise is different from vehicle to vehicle and this may lead to the incorrect conclusion that the vehicle has a condition. This noise is a normal operating characteristic of the engine. This noise has no short or long term effects on the engine. Do not attempt repairs for this noise.



<H4>Important</H4>


Replacing the engine or internal components for this noise will not reduce or eliminate the noise.

awesome...thanks for the update