Dreaded Knock/Ping

[sfcmartint]

Well I kinda figured it might happen to me as well.  The other day went out started my truck and heard the dreaded knock.  Lasted about 15 seconds and then quit.  Next day the same thing.  I have since taken it back to the dealer to have them look at it.  Just hope they dont give me a lame excuse as to why it is doing it.  I thought I had heard in here that there is a TSB out that addresses this issue.  If so, someone please help me out here.  I should mention that I just rolled the truck over 11,000 miles and it is an 02 with the 5.3 in it.

 

 

Thanks      

[fennsz]

Just my opinion, don't beat me up too badly for it. My truck does the same thing at 30,000 miles. Without some sort of pre-ignition pump to cycle the oil up on the pistons, you are bound to get this in every vehicle whether you hear it or not. The oil when you shut down your engine all runs back into the pan, thus it needs to make it's way back to the top of the motor when fired back up. It's common sense really if you ask me. If it's knocking and pinging during your drive I would be concerned, otherwise I feel it's normal to all vehicles.

Just my thoughts, again don't beat me up to bad.

[jhawk]

There is a web site that addresses this issue:

 

--edit--

 

For some reason this site wont allow me to post that web address, so just put those letters together and add the www and .com and it might work.

 

What they talk about on that site may or may not be what your problem is (assuming there is a problem).  The site is worth looking at anyway.  Good luck.

 

This has been discussed in a few previous threads why we don't allow linking to that site.  If you have any questions feel free to PM me.

 

-Jon

[Brew52]

The web site is www.angelfire.com/tx5/spamsite/ . Were it says spamsite put spamsite together

 

This has been discussed in a few previous threads why we don't allow linking to that site.  If you have any questions feel free to PM me.

 

-Jon

[chevy4x4trucks]

what you have is a cold start knock, common in all vehicles despite manufacturer, make, or model.  I'll have to agree w/ fennsz.

[TxDoc]

TSB Info

 

 

Info - Engine Knock on Cold Start #01-06-01-028 [b/]

 

Engine Knock on Cold Start

 

1999-2002 Chevrolet and GMC C/K Pickup and Utility Models

 

2002 Cadillac Esclade (2WD)

 

with 4.8L, 5.3L or 6.0L Engine (Vins V, t, U -- RPOs LR4, LM7, Lq4)

 

Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000) of use. The knock noise is most often noticed during initial start-up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticable on the initial start-up when the temperature is below 10 degrees C (50 degreees F) and may be more pronounced on the first cold start following a long trip.

 

This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS.

 

**IMPORTANT**

 

AT THIS TIME, ATTEMPTS TO REPAIR THIS CONDITION BY REPLACING THE ENGINE ASSEMBLY OR PISTONS IS NOT RECOMMENDED.

 

Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questoins or concerns, please advise your Area Service Manager.

 

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This has been an issue sence the first 4.8, 5.3, and 6.0 engines rolled out of the GM factory. As of right now there is no fix for this problem.