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What's This Noise?

1baddad

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1baddad Enthusiast

1baddad

Posted
Posted

This noise has kept my truck in the shop going on 4 weeks. Items replaced so far were all Lifters and new oil pump. Noise remains.

Dealer first said it was normal. If that were true why did they replace these items?

 

https://www.youtube.com/watch?feature=player_embedded&v=8Dr6MYVPZSE

there are 2 vids. 1 cold start the noise comes in at 45 sec.

2.Warm start the noise is noticeable from the start.

Gurrzt Enthusiast

Gurrzt

Posted
Posted

That is exactly what the youtube video title calls it, "piston slap".

My 2001 Z28 (Sara)has it @ cold startup, and the sound goes away once the engine is warm. Piston slap is caused by the 2 dis similar metals used by GM in their engines, the blocks are aluminum, and the piston sleeves are steel. When the engine is cold, the two metals contracted are at different tolerances, and when warm expand to the correct tolerances designed by GM.

 

AS LONG AS THE TICKING IS AT UNEVEN RYTHEMS, IT IS NORMAL, if the ticking is at a steady rhythm (and louder) even when the engine is warm, it is most probably a lifter.

 

As a side point, these engines are loud to begin with, and you COULD be hearing the fuel injectors tick.

 

The engine noise on the first video sounds normal to me, I AM BY NO MEANS AN EXPERT ON THESE VEHICLES.

 

JMHO

Robert1 Enthusiast

Robert1

Posted
Posted

If the engine didn't have the knocking sounds when new and up to several thousand miles I'm always confused when anyone attempts to write it off as "normal".

  • 2 months later...
Leekyledavid New Member

Leekyledavid

Posted
Posted

I have a 2009 gmc Sierra Denali with 6.2 L at 70k mi I had the oil changed and immediately I got a engine Tick it's annoying, why would GM come out with a new motor with the same problems that 75% of customers complain about. Sounds like I'm ghetto! I'm embarrassed to driving my truck like this. And it's not just a cold tick it does it at all times even after driving a 100 mi, what is it?

txab Senior Enthusiast

txab

Posted
Posted

What oil was installed? What is the oil pressure?

 

Try a different oil...

GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted

I have a 2009 gmc Sierra Denali with 6.2 L at 70k mi I had the oil changed and immediately I got a engine Tick it's annoying, why would GM come out with a new motor with the same problems that 75% of customers complain about. Sounds like I'm ghetto! I'm embarrassed to driving my truck like this. And it's not just a cold tick it does it at all times even after driving a 100 mi, what is it?

 

Has your concern been resolved? Have you brought this to the attention of your dealer? Feel free to contact me as well if you need additional assistance. Thank you.

 

Tricia, GM Customer Service.

Leekyledavid New Member

Leekyledavid

Posted
Posted

Its not been to a dealership and the oil was pensoil 5w30 it's a new issue and from what I hear the dealerships are just going to say its normal because every engine does it,

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