Help diagnosing a small ticking noise... 3rd-2nd
05-08-2010, 12:11 PM
#1
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Jul 2008
Posts: 726
Likes: 0
Received 0 Likes
on
0 Posts
Help diagnosing a small ticking noise... 3rd-2nd Was out having some fun last night and I accidently went from 3rd-2nd 
I caught it right away and pushed the clutch in. the motor now makes a very quite ticking noise, and it seems to be coming from the passenger side. It ticks very lightly at idle, almost like an exhaust leak and follows the rpms as they go up and down. (gets slightly louder as it goes up) I was reading and from my understanding it could be a pushrod being slightly bent.... I have checked the oil and there seems to be no signs of any metal shavings. good oil pressure. does not sound like something from the block to me, sounds more like valvetrain noise. the motor is still very healthy (minus the noise) has no problems starting up and still runs just like before. drives fine and still smooth with NO misfire of any sort. me get some ideas please!
Lee
edit: bolt-on ls1 with 90k. stock cam/heads/valvetrain
edit edit: Ok, so 3 of the 16 pushrods were bent... the louder noise that was there before is now gone. but there is still a small noise. it sounds almost like a sewing machine/exhaust leak... and it wasnt there before. any input as to what this noise could be? i torqued all the rocker arms to 22ft/lbs according to the service manual. but this noise is bothering me! Help!!!
I caught it right away and pushed the clutch in. the motor now makes a very quite ticking noise, and it seems to be coming from the passenger side. It ticks very lightly at idle, almost like an exhaust leak and follows the rpms as they go up and down. (gets slightly louder as it goes up) I was reading and from my understanding it could be a pushrod being slightly bent.... I have checked the oil and there seems to be no signs of any metal shavings. good oil pressure. does not sound like something from the block to me, sounds more like valvetrain noise. the motor is still very healthy (minus the noise) has no problems starting up and still runs just like before. drives fine and still smooth with NO misfire of any sort. me get some ideas please!Lee
edit: bolt-on ls1 with 90k. stock cam/heads/valvetrain
edit edit: Ok, so 3 of the 16 pushrods were bent... the louder noise that was there before is now gone. but there is still a small noise. it sounds almost like a sewing machine/exhaust leak... and it wasnt there before. any input as to what this noise could be? i torqued all the rocker arms to 22ft/lbs according to the service manual. but this noise is bothering me! Help!!!
Last edited by bongva; 05-20-2010 at 02:13 PM.
05-08-2010, 12:56 PM
#2
Teching In
Join Date: Mar 2008
Location: Apopka , Fl
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
You bent a pushrod. I did the same thing at the track just missed a gear 2-3 and bent three of them. They bend pretty easy from my understanding. My car make the same noise just as you are describing.
05-08-2010, 01:17 PM
#6
Teching In
Join Date: Mar 2008
Location: Apopka , Fl
Posts: 42
Likes: 0
Received 0 Likes
on
0 Posts
I see ok, so should i just pull off the passenger side? or pull off both sides?
05-08-2010, 11:32 PM
#7
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Jul 2008
Posts: 726
Likes: 0
Received 0 Likes
on
0 Posts
so when everything goes back in, do i have to do a vavle lash? im kinda confused on the going together part.... is there a write up for it?
2 out of 4 push rods were bent on the passenger side, driver side will be tomorrows project. just gonna throw in some oem's for now, need the car asap and a buddy of mine gave me some of his old ones. thanks smok'nz!
2 out of 4 push rods were bent on the passenger side, driver side will be tomorrows project. just gonna throw in some oem's for now, need the car asap and a buddy of mine gave me some of his old ones. thanks smok'nz!
Trending Topics
05-20-2010, 02:12 PM
#8
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Jul 2008
Posts: 726
Likes: 0
Received 0 Likes
on
0 Posts
Ok, so 3 of the 16 pushrods were bent... the louder noise that was there before is now gone. but there is still a small noise. it sounds almost like a sewing machine/exhaust leak... and it wasnt there before. any input as to what this noise could be? i torqued all the rocker arms to 22ft/lbs according to the service manual. but this noise is bothering me! Help!!!
05-20-2010, 02:28 PM
#9
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Jul 2008
Posts: 726
Likes: 0
Received 0 Likes
on
0 Posts
it kinda varies with engine speed, but as it gets a little higher in the rpm, say 2000-2400rpm i cant hear it anymore, it stays the same noise level and doesnt get any louder as the rpms go up.
05-22-2010, 09:51 AM
#11
Any change in your oil pressure levels from before the incident? Bad lifters can affect oil pressure.
There are other things, as you probably know, that can cause ticking noises on LS motors like an exhaust leak as you have already mentioned and a loud fuel injector.
There are other things, as you probably know, that can cause ticking noises on LS motors like an exhaust leak as you have already mentioned and a loud fuel injector.
05-26-2010, 10:17 PM
#13
TECH Fanatic
iTrader: (11)
Join Date: Sep 2005
Location: fort walton beach,fl
Posts: 1,954
Likes: 0
Received 0 Likes
on
0 Posts
sewing machine sounding operation is normal, bending push rods are not. once they are bent it allows lifters to bounce off of cam and if left unchecked can result in lifter failure chances are you are fine, if it gets louder then be worried. valve float also happens during an over revv and can bend valves from piston collision which bends push rods. there is some power unlocked when hardened PR's are installed. be more carefull.do a compression check
05-26-2010, 10:45 PM
#14
TECH Resident
iTrader: (5)
Join Date: Nov 2008
Location: Arkansas
Posts: 999
Likes: 0
Received 0 Likes
on
0 Posts
You're absolutely sure it's not a header leak? There was a guy over on performancetrucks.net that had the same problem (3rd-2nd). He has an S10 with a t56. I'll try and find the thread and post it up tomorrow. He said the replaced the header gasket and it went away. Might be a start. Especially if you've had them on there for a while. Shouldn't hurt to replace them...
Oh and by the way. Your car ran really good that night you guys came down to The Fort. I think we are going to come up there in a couple of weeks. I am at least when I get my car together.
Oh and by the way. Your car ran really good that night you guys came down to The Fort. I think we are going to come up there in a couple of weeks. I am at least when I get my car together.
05-26-2010, 11:03 PM
#15
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Jul 2008
Posts: 726
Likes: 0
Received 0 Likes
on
0 Posts
sewing machine sounding operation is normal, bending push rods are not. once they are bent it allows lifters to bounce off of cam and if left unchecked can result in lifter failure chances are you are fine, if it gets louder then be worried. valve float also happens during an over revv and can bend valves from piston collision which bends push rods. there is some power unlocked when hardened PR's are installed. be more carefull.do a compression check
05-26-2010, 11:04 PM
#16
TECH Enthusiast
Thread Starter
iTrader: (7)
Join Date: Jul 2008
Posts: 726
Likes: 0
Received 0 Likes
on
0 Posts
You're absolutely sure it's not a header leak? There was a guy over on performancetrucks.net that had the same problem (3rd-2nd). He has an S10 with a t56. I'll try and find the thread and post it up tomorrow. He said the replaced the header gasket and it went away. Might be a start. Especially if you've had them on there for a while. Shouldn't hurt to replace them...
Oh and by the way. Your car ran really good that night you guys came down to The Fort. I think we are going to come up there in a couple of weeks. I am at least when I get my car together.
Oh and by the way. Your car ran really good that night you guys came down to The Fort. I think we are going to come up there in a couple of weeks. I am at least when I get my car together.
thanks again man! what were you in?
