A couple of days ago i installed a nitrous kit in my T/A, I gave it a 75 wet shot on a stock eng. When i hit the nitrous it took off smooth then i let of the throttle and the eng. cut off. I tried starting it, but it didnt start, after investigating i took off the bellow going to the tb and found that the fuel solenoid was stuck open, so it was basically choking. After removing the n20 fogger from the bellow and lettin it sit there for a while, it finally started, but it was making a loud knocking. . Ithought maybe a bent push rod. But then this weekend i took the valve covers off and everything seems normal. Anyone have any pointers or has had the same prob. Please HELP.

 

did you actually take the PRs out and check to make sure that they are strait?

 

how is your oil pressure ? if it is very loud it could be a spun bearing maybe it's just a p-rod.

 

Did it sound like this:

http://media.putfile.com/LS1-knocking

 

Ya for sure check the pushrods. But its probably not gonna be that simple.

 

Is the kocking coming from under the valve cover or from the oil pan. get a stechascope and check where it is coming from

 

MAKE SURE you pull all your pushrods out when you check. if you bent a pushrod, you may have damaged the lifter. when i bent a pushrod, i knocked the keeper out of my lifter.

 

ypull all the PR's and roll hem on a peice of Glass or a mirror

 

Yea it sounds very similar to that . What is it?

 

I would have to say the knock in the video is a rod knock for sure. If yours sound like the one in the video you have major problems

 

maybe fuel hydrolocd the motor

 

It was a broken piston skirt. This was the thread that I posted:
https://ls1tech.com/forums/texas-members/541772-engine-knocking-tapping-loud.html