Page 1 of 2 12 LastLast
Results 1 to 20 of 24

knocking sound, from valves (possibly)

This is a discussion on knocking sound, from valves (possibly) within the GTO forums, part of the Vehicle Specific category; Hi guys, I need some thread support on this one. I'm getting a ticking sound from what sounds like the ...

  1. #1
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    knocking sound, from valves (possibly)

    Hi guys, I need some thread support on this one.

    I'm getting a ticking sound from what sounds like the heads. I have an 05 GTO. I spoke to a mechanic over the phone and he said it's possibly a cracked valve spring. If I were to decribe the sound, it sounds like a tapping from the rockers on either a rod or spring. It's very faint at idle and sounds louder when the revs are dropping....I heard it for the first time two days ago, car is grounded now. When I removed the covers, the sound was louder. any one have this issue before?? what should i do???

    What side is bank1? or 2?

    Any info woulde be appreciated.

    Loz from Texas

  2. #2
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    Manual car? Did you over rev recently? You said you did remove the valve covers? No broken springs? Next easier thing to do would be to pull the pushrods and roll them on a flat surface to check for a bent rods.
    370 CI - Twin 6766 Turbo - Jakes stage 5 4L80E - MWC 9" - Holley Dominator

    Build in progress...

  3. #3
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    Pretty sure Bank 1 is always the side of the engine with cylinder #1. For our cars, this is the left side (1,3,5,7)

  4. #4
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    I did over rev recently....hm..

    I removed the last two rockers and rods but they looked pretty straight. Maybe i should just roll them. spring doesnt look bad, but not sure how to check. Bank 1 is left side from inside or looking at car from front?

  5. #5
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    looking at it from the front.

  6. #6
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    Thanks for the bank info. I've been getting P0237 code for bank one, but this was there for a while. Knock sensor (low voltage). Just recently I started getting an 02 sensor reading also..... more info for diagnosis.

  7. #7
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    What would fail first, valve, valve spring, or push rod

  8. #8
    Moderator 35th-ANV-SS's Avatar
    Join Date
    Oct 2008
    Location
    Wherever life takes me
    Posts
    12,465

    Red
    02 35th LE Camaro SS

    Quote Originally Posted by civenegas85 View Post
    What would fail first, valve, valve spring, or push rod
    If over rev'd I would think a push rod would bend first, if stock. They are supposed to be the weakest link. Could be wrong though.

  9. #9
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    I'll double check them again tonight....anyone know the torque settings for rocker screws?

  10. #10
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    Quote Originally Posted by civenegas85 View Post
    I did over rev recently....hm..

    I removed the last two rockers and rods but they looked pretty straight. Maybe i should just roll them. spring doesnt look bad, but not sure how to check. Bank 1 is left side from inside or looking at car from front?
    I would start looking there. Pushrods will make this noise, and are easy to bend [stock].
    Quote Originally Posted by civenegas85 View Post
    What would fail first, valve, valve spring, or push rod
    Stock, A pushrod will bend first. Some guys leave stockers in there for a fail safe. Valve spring shouldn't fail if set up correctly and used in the correct application.

    Quote Originally Posted by civenegas85 View Post
    I'll double check them again tonight....anyone know the torque settings for rocker screws?
    22 ft/lbs

    Roll them on a piece of flat glass. If they are really bent, you should be able to notice by just looking at them.

    Edit: Pull the fuel pump fuse and disconnect the two main coil connectors. Turn the engine over a few times and then recheck your rocker arm torque.
    Last edited by Hi-Po; 02-28-2010 at 11:50 AM.

  11. #11
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    Good info......what would be the part number for the pushrods. Where can I get them fast? and Where can I get the better price?

  12. #12
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    Mark at WWW.kyspeed.com can get them fast and cheap. PM him at marksls1ta. He get you you squared away.

  13. #13
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    Should I keep the car grounded? or can I drive without pushing it?

  14. #14
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    I'm gonna keep it grounded, plus i went to kyspeed.com and there isnt much regarding GTO parts, should I just look under Camaro parts?

  15. #15
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    Send him a PM here on this board. User name is

    Marksls1ta

  16. #16
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    I rolled the push rods today and they are straight. I just called my local GM Dealership and I just ordered 2 valve springs. I'll pick them up tomorrow. I know a few things for sure. It is not the rods, or the rockers. Next could be the valve or valve spring.

    To make sure it wasnt the rockers or the rods I actually switched the back two with the front two. I switched the rockers and the rods. When I put them back together and started it up again. The sound still came from the back (where sound originally came from). All the rods are the same size, 7.400" in length.

    Anyone have a how to on valve spring replacement?

    I know my way around an engine so I know I can do it myself, but it would save the time from learning as I go along.

    Thanks guys.....

  17. #17
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    Quote Originally Posted by civenegas85 View Post
    I rolled the push rods today and they are straight. I just called my local GM Dealership and I just ordered 2 valve springs. I'll pick them up tomorrow. I know a few things for sure. It is not the rods, or the rockers. Next could be the valve or valve spring.

    To make sure it wasnt the rockers or the rods I actually switched the back two with the front two. I switched the rockers and the rods. When I put them back together and started it up again. The sound still came from the back (where sound originally came from). All the rods are the same size, 7.400" in length.

    Anyone have a how to on valve spring replacement?

    I know my way around an engine so I know I can do it myself, but it would save the time from learning as I go along.

    Thanks guys.....
    I just made one for you, and others

    How to replace Valve Springs

  18. #18
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    Thanks, just looked it over and it does not look like rocket science, just gotta have the right tools and patience. I love my car so I'm ready to put in the time.

    Pix look great too, easy to understand. Now I just need the parts and tools. Any suggestions incase it's the valve that I need to replace? I may have to remove the head completely huh.....

  19. #19
    Veteran Hi-Po's Avatar
    Join Date
    Nov 2005
    Location
    Florida
    Posts
    10,461

    Black
    1999 TA WS.6

    Nope, its really easy Pictures help everyone feel confident going into an install.

    I don't know why it would be a valve. But yes, you will have to remove the head. Gonna have to remove the head to even look at the valve. But the chances of it being a valve are pretty slim unless on that over rev situation they hit the piston. Being stock pushrods, that's not likely to happen at all.

  20. #20
    Junior Member civenegas85's Avatar
    Join Date
    Feb 2010
    Location
    Houston
    Posts
    18

    Black
    2005 Pontiac GTO

    How can I be certain its a broken spring or valve? What should I look for. With the valve cover off, the springs are very difficult to move, could a small crack make the tension be too low?
    Last edited by civenegas85; 03-01-2010 at 04:03 PM. Reason: added info

Page 1 of 2 12 LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Slight knocking sound
    By silverWS6 in forum General Help
    Replies: 1
    Last Post: 04-30-2011, 07:30 PM
  2. Help: Knocking sound from rear end
    By PatrizioD in forum GTO
    Replies: 16
    Last Post: 04-10-2011, 11:31 AM
  3. Question: Knocking sound & burning a little oil
    By bull1112 in forum General Help
    Replies: 9
    Last Post: 05-17-2009, 06:46 PM
  4. Knocking sound with VID.
    By casperss in forum General Help
    Replies: 11
    Last Post: 09-10-2008, 05:26 PM
  5. Chattering/rattling sound. Possibly in my clutch?
    By LS1nterceptor in forum Drivetrain
    Replies: 0
    Last Post: 08-12-2008, 09:38 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •