NastyNate65

I have owned my 98 Z28 since last march (09) and I did not notice any noises or knocking until about december when it got really cold outside. Long story short, every time I start it up when its below freezing, and for the first time of the day, I hear a knocking noise coming from the engine that usually goes away after about 30 seconds. It sounds like oil is not getting all the way through the motor right away. Any one else have this same issue? Thanks for any suggestions

kinglt-1

iTrader: (26)

Sounds like a typical ls motor to me...

FASTEDDIE Z

iTrader: (4)

yep !! My 98 does the same thing cold . Typical

bjamick

iTrader: (31)

Yup, my 5.3 truck does the same thing.

99LS1Bird

im in Louisiana so we dont have those problems but ive heard to run a thinner oil during the colder months of winter like 5-w20 instead of 10-w30

NastyNate65

Thanks guys, thats a huge relief!!

It runs great regardless, so thats why I was curious

TurdsOfMayhem

iTrader: (4)

Mine hates anything close to 50, lower than that, I swear I have a diesel...

kinglt-1

iTrader: (26)

It really don't matter what the climate is... LS engines are known to knock on cold starts, wheather it's 80 or 20 outside. It's called "piston slap" and it's normal, long as it goes away when the engine comes up to temp.

fearthisss

iTrader: (6)

some do it some don't all the ls motors i have owned made that noise till the engine got some heat in it and both were owed till 150000 miles and still going

01'SSLSX

this is typical. u are hearing piston slap, it goes away when engine is warmed up

allmotr_ss

mine does the same thing i was a bit worried at first but i was told that its normal some call it the "ls1 Knock"