miacamaro305

hey guys im having a big problem my engine is making a loud knocking noise. at idle its fine at 1500 rpm till 4500 it knocks like crazy.the car still has power so i dont think it killing power but the noise ohh its ugly wat the hell can it be?knock sensor?vavletrain?wat?

rjmcgee

Sounds terminal.

Rod bearing maybe.

ede

why don't you listen to the engine and try to pin point the loation of the knocking a bit more. then maybe remove valve covers or whatever covers the noise.

Iroc n roll

To expand a bit on what ede is telling you to do, try taking a long screwdriver and putting the butt to your ear and the tip of it on different parts of the engine to pin-point the sound. I know it sounds kinda silly and your friends might make fun of you if they watch but it works. Sound travels faster through denser materials (here iron vs air) so it'll give you a better idea of the actual location of the sound. Are you getting any codes? Come back when you pin-point the sound we will be able to be more helpful.

Stekman

A little better than a screwdriver, well to some at least, is a length of heater hose. I have a 2' section of 5/8" heater hose i use specifically as an automotive stethoscope.

ede

yes i realized last nite after i typed this and got off line i should of said with a screwdriver or piece of hose. even better yet is a mechanics stethoscope.

miacamaro305

the noise happen once i played with the timing went away for like 3 weeks then my car turn off and battery died and next i charge the batt and when on the knocking started and has not gonne away even with paying with the timing?

Iroc n roll

You gotta find out where its coming from for us to be of any real help.

90tbi305

well never mind guys the noise was a bad rod, so the engine blew so i will be rebuilding it in the next 3 weeks and putting a lt1 cam for better specs

DonP

Do you think the bad rod was caused by detonation from playing with timing or something else?