Piston slap

[yukonic]

same here, i have an 01 5.3 and hear a little tapping only on cold starts for about a block of driving.

 

[04SS99Denali]

just thought id throw this out but if you think these motors slap bad you should hear some of the LS1's LS2's ive heard. crazy loud my LS1 in my camaro slaps till its warm also

 

[gnilson]

Do you think the warranty will give you a new motor because of piston slap, Something that GM says is normal?

You're kidding, right? GM says this is normal? Where? Is there documentation of warranty claims being denied? I would seriously be shocked. If this is normal, then why isn't it happening to every LS motor out there?

 

[Vinniety]

You're kidding, right? GM says this is normal? Where? Is there documentation of warranty claims being denied? I would seriously be shocked. If this is normal, then why isn't it happening to every LS motor out there?

This has been discussed for years and i cant recall finding anything that states GM is taking blame and they are going to recall all these motors. Here are a few web sites that might help you.

http://www.gmproblems.com/engine.htm

Below is a comment from someone on the web:

"I have been told by the GM training center that aluminum expands almost twice as much as cast iron. So the pistons have to be made smaller so they fit properly when warmed up. My 3.4 V6 has done the same thing (another engine with this congenital problem) since about 15,000 miles and has caused no trouble, I have 148,000 on it now. If it only make the noise for a few minutes cold I would not be concerned, almost every one I see in the shop has this noise. In fact I don't even notice it because because I hear it so much, it is just how these sound. I think this has been present in earlier times but the blocks were significantly heavier then and that muffled the noises better than today. Couple that with how much quieter todays vehicles interiors are and you hear things that you did not before. At 98,000 miles I would just ignore it and drive it, most likely it will never cause you trouble."

I have 97K miles and i have to say truck runs just as strong as day one. With so many people stating they have 200K and higher miles on these motors with that noise and the motor has never been opened that makes me feel a little bit better.

 

[chauncey0337]

You're kidding, right? GM says this is normal? Where? Is there documentation of warranty claims being denied? I would seriously be shocked. If this is normal, then why isn't it happening to every LS motor out there?

Of course GM says it's normal. You think they want to recall thousands and thousands of vehicles because of an engine noise.
Not sure if warranty claims have been denied but I've heard of GM extending warranties to pacify some owners. Most say it mainly occurs in aluminum blocks because aluminum expands 2x more than cast. Google it and prepare to be shocked.