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5.3 liter knock

baierr

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99xjsport06 Enthusiast

99xjsport06

Posted
Posted

http://www.gm-trucks.com/forums/index.php?showtopic=57746

 

That is the thread I have going right now with the problems i'm having out of my step-dad's 5.3. I understand that some valve tapping is normal on this engine, but what i've got it definitely a lifter issue. Is this similar to what you're experiencing?

 

I just changed the oil today to 5W30 and added a pint of Marvel Mystery Oil, and so far it has quieted down. The true test will come tomorrow morning.

tcas1355 Enthusiast

tcas1355

Posted
Posted
http://www.gm-trucks.com/forums/index.php?showtopic=57746

 

That is the thread I have going right now with the problems i'm having out of my step-dad's 5.3. I understand that some valve tapping is normal on this engine, but what i've got it definitely a lifter issue. Is this similar to what you're experiencing?

 

I just changed the oil today to 5W30 and added a pint of Marvel Mystery Oil, and so far it has quieted down. The true test will come tomorrow morning.

 

How many miles? Mine taps a bit too, but i'm pretty sure it's just carbon build up. It's not too severe. I will be trying TEC tomorrow to see if that helps.

  • 1 month later...
davegee Enthusiast

davegee

Posted
Posted

Welcome to Vortec engines!.......I disliked the knock so much it made me buy a remote starter, so I dion't have to listen to it.

 

Check out www. piston slap . com

pwall Senior Enthusiast

pwall

Posted
Posted

GM says it's normal....thus you don't have a lot of options other than to live with it. :rolleyes:

jason2006 Enthusiast

jason2006

Posted
Posted

Is nothing but the aluminum piston smacking the bore until it gets a lil heat in it and expands. Sounds worse than it really is

  • 2 weeks later...
Lindsey Enthusiast

Lindsey

Posted
Posted

my 2000 5300 has had a cold weather tick that goes away after about 1minute of running. Since it was maybe 2 years old. GM said normal live with it. The other day just for the heck of it I am poking around and still wondering why it does this, I grabbed the fan blade just to check the clutch. I know it can't be, but since I did that, it hasn't ticked. I have to add, this sound comes in after maybe 15 seconds from start up, so I don't think its lifter related.

Caprice89 Enthusiast

Caprice89

Posted
Posted
...and still wondering why it does this, I grabbed the fan blade just to check the clutch. I know it can't be, but since I did that, it hasn't ticked. ...

 

What do you mean by "grabbing the fan blade"? Just checking free play or trying to stop it while idle-ing?

DanMan_S Enthusiast

DanMan_S

Posted
Posted

The big question to ask is who actually had an engine failure that was related to the piston slap? We've had it in our last 4 GM trucks with gas engines (05 Silvy, 98 Sierra, 01 Yukon XL, 98 Suburban) and never had a piston related problem (the 98's 5.7 bit the dust due to a failed oil pump and oil starvation during revving).

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