no_other_lead
12/10/2007 7:43:47 PM
My 03 impala makes a knocking noise when it is cold and goes away when warmed up,i have had people tell me it is the lifters but im not sure.Can anyone help?
Gad1357
12/11/2007 8:52:13 AM
Its the lifters goes away after a couple of seconds? Next oil change put in a bottle of Z Max should get a little better.
rbarrios
12/11/2007 10:41:28 AM
not sure how prone the impala engines are to this..
but on the inline 6 trailblazers - and some other engines- they get what is called Cold Carbon knock.
cold engine in the morning- the engine knocks a little. once its warmed up- its quiet.
This noise can be quieted for a bit- by running a bottle of chevron techron to get rid of the carbon buildup.
Mine quiets down a bit. not entirely, but it does help.
if you try chevron- and it doesnt quiet down- then at least you cleaned your injectors, and you then proceed to another cause.
