6']['9

iTrader: (2)

I started the car yesterday after it sitting for a month or so. it started up pretty good but i did notice the idle was high right at around 1,5k. So i reset the tps and it came down and as soon as i restarted it i heard a knocking sound coming from the passenger side. When rev the motor a bit where the throttle cable is it seems to get louder n faster. It kinda sounds like a woodpecker hitting a tree if that makes any sense. But i have never heard this sound before so im not too sure where to start. Im thinking i should start checking the pushrods but i want to ask before i start taking things apart.


Thanks
Jay

1c62nv

iTrader: (3)

knocking or tapping?? Sound clip please

ExclusivePerformance

iTrader: (1)

A sound clip would help generously.

But to prematurely say what it might be, the main two things it sounds like are either rod knock or a valve contacting a piston. Both will increase with rpm.
A rod knock usually sounds deeper, with valve contact sounding more like a click or snapping your fingers.
Does the car have an aftermarket cam/springs/pushrods? A bent pushed or broken valvespring could be the culprit, even if stock. thats the easiest/cheapest out of the two to check and fix.

Just pull that valve cover and check the valvesprings first, then the pushrods.

6']['9

iTrader: (2)

It's more of a knock. When I get home I'll get a clip on my iPhone but I don't know if it will come up here. The car has heads n cam that were installed 2 years ago. It's pretty loud but only comes from the passenger header side.

Elite_Hot_Rod

Does the sound go away after the engine is warm? The LS1 is notorious for cold start piston slap, it's a common problem.

6']['9

iTrader: (2)

Nope it doesn't go away but its running fine after I reset the iac.

Ws6kid.

Piston SLAP! :S i have it =/

6']['9

iTrader: (2)

well i started it when i got home from work & now the noise is gone. Like i said before i havent started that thing in almost close to 2 months. but ill keep an eye on it and see how it acts if i get to drive it this week.

kp483

iTrader: (2)

Piston slap or maybe a bad lifter?

6']['9

iTrader: (2)

well after reading im gonna try n replace the Oring on the oil pump to see if that fixes it first.

SEB

iTrader: (12)

Man I know that AH **** feeling! Goodluck, Im sure its something simple as stated above

Bad Chad

iTrader: (94)

Is the oil pressure bad or moving around?

Pull the oil dip stick out and see if there is any metal in the oil.

6']['9

iTrader: (2)

Oil pressure is good, no metal on the dipstick or bubbles and the lifters are new when I did the H/C/I

Marcoz/28

dam 9 months later and your still trying to figure it out u must really have no time. sux bro.

6']['9

iTrader: (2)

yep the last time i drove it was in march so it does nothing but collect dust. it drove fine then

JMBLOWNWS6

iTrader: (17)

That sucks

Bad Chad

iTrader: (94)

If the oil pressure is good then there is no need in changing the o-ring on the oil pump

Manic Mechanic

iTrader: (3)

Exhaust leak at the header flange? These can sound very much like this. They will be louder on a cold start.

Vernon

6']['9

iTrader: (2)

Vernon how can I check that?

6']['9

iTrader: (2)

I can take a vid but I don't know how to post it