the other day my friend was driving his car everything was fine then he starts the car and hears this noise we dont know if its the bottom end or a push rod or sumthing any thoughts will help us out alot thanks...


http://www.youtube.com/watch?v=e4Px7zlbonI

 

Valvetrain would be my guess, bent pushrod, collapsed lifter, rocker needle bearings, etc. Pull a valve cover or two.

 

hard to tell from the vid, Could be something in the valve train, as stated above pull the covers and check everything, It could also be a rod letting go, Either way I would not drive that car like that, whatever it is sounds real bad.. also where is your air filter assy?

 

ok we'll check that out thanks...

 

what would we be looking for when we pull the covers?..he hasnt drove it since it happened...its sounds extremely bad and where hoping its not the bottom end...it didnt have the assy when he bought it so he has to get all the pieces...

 

Sounds like a bent push rod, but thats more common for a m6 car, can see by the video its a a4. If its not a pushrod, then its something in the valve-train, like said above, pull the covers and start fishing around, you'll find something.

 

Sounds like a bad lifter.

 

sounds like the push rod hitting the valve cover, ive seen it before. maybe the rocker slipped off or broke a stud for some stupid reason.

 

Sounds more like a pushrod hitting the valvecover. Kind of fast to say lifter.

 

That's exactly what my Honda sounded like with a bent rod. Just my 2 pennies.

 

maybe its mad at you for calling it a bitch...... when you take off the valve covers it should be pretty easy to tell if its a rocker, one of them will look obviously different from the others

 

does this come from high miles or just a failed part that can happen to any LS1?

 

ok will do thanks bro


haha she's a bitch when she's bad and his baby when she's good l0l

 

IMO sounds like a spun rod bearing.

 

thats the worse case and where hoping it isnt but we'll kno by sunday

 

that sounds exactly like what my buddies didwhen he had a rocker arm loosen up after a cam swap. i would lean top end for sure. lifter, pushrod, or rocker

 

Ever figure it out?

 

He had some guy come take a look and the guy said its the rod bearings so he's just gonna get another LS1 short block...