anyone want to help this guy? 
Little help on bad case of piston slap
Thread Starter
On The Tree
Joined: Jul 2005
Posts: 153
Likes: 1
Little help on bad case of piston slap hey guys..ive got a very bad case of piston slap in my 02. 
42K on the odo. it seems to be most prominent at 1K to 2K rpm (the beginning of each gear especially 1rst and 2nd) 
. i run 5.75qts of mobil 1 5W30. i also notice that my gas goes pretty damn quick compared to my old LT1. question is..is there anything i can do to lesson the sound of the slap? thicker oil? anything? also do you think i could be getting bad gas milege bc of bad combustion due to the lack of seal betwen piston and bore? also do you think my PCM is picking up knock, thus retarding my timing bc of this piston slap. 
my LT1 would pick up crazy knock even with a LT4 KM. all comments and help is appreciated. thankyou 
42K on the odo. it seems to be most prominent at 1K to 2K rpm (the beginning of each gear especially 1rst and 2nd) . i run 5.75qts of mobil 1 5W30. i also notice that my gas goes pretty damn quick compared to my old LT1. question is..is there anything i can do to lesson the sound of the slap? thicker oil? anything? also do you think i could be getting bad gas milege bc of bad combustion due to the lack of seal betwen piston and bore? also do you think my PCM is picking up knock, thus retarding my timing bc of this piston slap. my LT1 would pick up crazy knock even with a LT4 KM. all comments and help is appreciated. thankyou
Originally Posted by Lvmyz28
well, you could buy a mustang. that's what most f-body guys are doing now since gm is so stupid. but that's about it!
That is a good way to spend $20K+ and run in the 14's..why would anyone with a LS1 want to do that???
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I would never buy a stang. I was just making a dumb comment to bring up the point that he can't do anything about it besides rebuild the motor, and use aftermarket pistons! It's the way the pistons are designed that makes them slap.
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Launching!
Joined: Dec 2003
Posts: 260
Likes: 0
From: Palm Bay, Florida
GM considers piston slap to be "normal" in our engines. They will not fix it unless you are losing a certain amount of oil. In my case I was losing almost a quart a month. When they took it apart they found that the rings on one of the pistons were lined up so that oil was coming into the intake. 
I actually complained and kept on bringing it back for "noises" so much that they gave me an 04 ls6 block because that didn't make the ls1 anymore
. Plus the fact that it went through an extended warranty company which didn't give me the GM run around.
I actually complained and kept on bringing it back for "noises" so much that they gave me an 04 ls6 block because that didn't make the ls1 anymore
. Plus the fact that it went through an extended warranty company which didn't give me the GM run around. 
I would change the brand of oil. My '02 had a bit of slap when I bought it. I think that why the previous owner gave me that deal. I put in Royal Purple oil instead of Mobil and it went away. Now I have Mobil in it again, but I cant hear anything now because of the heavy cam. 
Launching!
Joined: Dec 2004
Posts: 240
Likes: 0
From: New Jersey
The new gold GC 0W30 is not the same as the green. I just switched to Amsoil 5w40 and it quited my piston slap a little. You might want to try that or the Mobile 1 5W40 T&SUV. The 5W30 Mobile 1 you are using is too thin. My slap goes away when warm and I do not use any oil.
