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 ...
02-28-2010, 09:59 AM #1
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
02-28-2010, 10:02 AM #2
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...
02-28-2010, 10:12 AM #3
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)
02-28-2010, 10:30 AM #4
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?
02-28-2010, 10:31 AM #5
looking at it from the front.
02-28-2010, 10:34 AM #6
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.
02-28-2010, 10:38 AM #7
What would fail first, valve, valve spring, or push rod
02-28-2010, 10:39 AM #8
02-28-2010, 10:41 AM #9
I'll double check them again tonight....anyone know the torque settings for rocker screws?
02-28-2010, 10:46 AM #10
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 10:50 AM.
02-28-2010, 01:56 PM #11
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?
02-28-2010, 02:04 PM #12
02-28-2010, 02:20 PM #13
Should I keep the car grounded? or can I drive without pushing it?
02-28-2010, 04:38 PM #14
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?
02-28-2010, 04:49 PM #15
Send him a PM here on this board. User name is
03-01-2010, 12:15 PM #16
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.
03-01-2010, 01:13 PM #17
03-01-2010, 02:19 PM #18
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.....
03-01-2010, 02:44 PM #19
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.
03-01-2010, 03:02 PM #20
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 03:03 PM. Reason: added info
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