palmersz28

iTrader: (4)

when i first crank my car up i believe what everybody calls piston slap? it sounds like its skipping but it doesnt do it long just on first crank up and in stop and go traffic after about 5 minutes after crank up it will stop what do yall think it is and what do can i do to fix it?

FamousWS6

yeah that sounds like piston slap. it sounds like a "clapping". alot of us have it, its a big thing for ls1's. some people have it worse than others. from what everything has been said about it, it doesnt really hurt anything. its just annoying. You cant fix it, without rebuilding the entire motor. the piston rings get hot as the car warms up ( duh ), and when the rings get hot, they expand and you no longer can hear your piston slap as bad. like i said, some people have it worse than others. like, my car, its pretty loud at first, and it never entirely goes away, it just quiets up alot, untill i revv it up again, then you can hear it as the rpms fall back down. then it goes away again. its odd. i hear, if you use a thicker oil, it can quiet it up. but ive never tried it yet. i wouldnt worry about it man.


Dave

lastofthebreedWS6

I had it since the day I bought my WS6 new. Around 15K miles one of my cats failed, I mentioned the slap to the dealer while it was there and wound up getting a new motor. It never seemed to affect performance, as stated above, I wouldnt worry a whole lot about it unless it got to a point where it didnt go away after reaching op. temp. Or of course, unless you start burning oil

samson_420

iTrader: (1)

You can't really fix it.

Just don't make it worse by getting on pedal before the car is warmed up.

palmersz28

iTrader: (4)

-ttt-

Shackleford

iTrader: (12)

Does it sound like a belt that needs to be lubricated or whatever?

palmersz28

iTrader: (4)

no no no its internal and sounds pretty nasty

qwk93ta

iTrader: (13)

Mine only does it when it is cold out....has not done it all summer.

palmersz28

iTrader: (4)

yep thats what it does only when the motor is cold

samson_420

iTrader: (1)

My Saturn's 2nd motor did it bad. It sounded way crazy untill it wormed up.

Shackleford

iTrader: (12)

Really? I guess I just need to lube my belt up. lol. But, the noise usually goes away once I've been driving for a little bit.

quadd2244

iTrader: (13)

I have been pretty lucky. I believe I heard somewhere that 99-00 cars had piston slap but cant confirm that and I know I know someone with a 2000 vette and it has zero piston slap. Hell even my Trans am its a 98 with 85k on the clock has ZERO slap even in the middle of winter if I have to start it to move it or something.

It doesnt affect performance at all I dont believe and wont be harmful but I really am not 100% sure on longterm damage

qwk93ta

iTrader: (13)

when it is really cold out mine will sound like a rod knock for about 30 seconds.

blue02bird

iTrader: (7)

mine does it the entire time the car is running. It sounds horrible going through drive-thru's

samson_420

iTrader: (1)

That sounds more like a knock.

ZMONSTER!

iTrader: (9)

shoot mine sounds like a freaking sewing machine on HGH and steroids. Of course cam and lt's will do that.

dailydriver

How can one tell the difference between rod knock and piston slap??

Do they sound exactly alike except that the piston slap goes away after warm up???

2LS1TA

My 02 WS6 does it all the time, too. I've had several ls1 f-bodies and they've all had it to some degree but my current one has it the worst.

blackcamarob4c

Yay my ex cop car(b4c) does that till it gets warmed up. but it does not effect the way it performs. No loss in oil pressure or anything. It is just the way it is with these alum block baddasses!!

2LS1TA

Yeah, but mine does it even when it's warmed up.