Engine noise... help identify
#1
Melting Slicks
Thread Starter
Engine noise... help identify
Cold start up. The ticking sound is coming from the pass side as you will see in the video. The sound does not increase with throttle. It seems to go away mostly once the car is warmed up. What are your thoughts?
Last edited by bwill03z; 07-01-2016 at 06:33 PM.
#2
Pro
Sounds like either a lifter, or a loose rocker arm/adjustment needed, if it goes away once the car is warmed up its because the clearances are tighter from the heat expansion. Does it do it after the car is shut off for a few minutes and you start it from warm?
#3
Melting Slicks
Thread Starter
I don't know I will check and see when I get a chance. I never really noticed it until today.
#4
Le Mans Master
I can't listen to the video my PC audio is crapped out... but, I know there is an issue with valve springs breakage on some Z06 motors.
I would take an old broom handle/long screw driver and stick on where you think the sound is coming from and put your ear on the other end you will be able to hear EXACTLY where it is coming from if you keep searching for it and should give you a better idea of maybe what the problem is
I would take an old broom handle/long screw driver and stick on where you think the sound is coming from and put your ear on the other end you will be able to hear EXACTLY where it is coming from if you keep searching for it and should give you a better idea of maybe what the problem is
#5
Melting Slicks
Thread Starter
I can't listen to the video my PC audio is crapped out... but, I know there is an issue with valve springs breakage on some Z06 motors.
I would take an old broom handle/long screw driver and stick on where you think the sound is coming from and put your ear on the other end you will be able to hear EXACTLY where it is coming from if you keep searching for it and should give you a better idea of maybe what the problem is
I would take an old broom handle/long screw driver and stick on where you think the sound is coming from and put your ear on the other end you will be able to hear EXACTLY where it is coming from if you keep searching for it and should give you a better idea of maybe what the problem is
#6
Le Mans Master
#7
Melting Slicks
Thread Starter
Just looked at it again, the sound actually does get louder with throttle... once the car warms up it goes away. Let it sit for awhile turned off then cranked again... sound was back until operating temp.
Last edited by bwill03z; 05-07-2016 at 08:32 PM.
#8
Pro
Pull the valve cover and check the clearances of each rocker arm. One could be loose. And as your checking you can see if anything looks out of the ordinary.
#9
Melting Slicks
Thread Starter
If it is a lifter do you guys think a full Seafoam treatment might ne a good idea?
#10
Pro
It won't help if the lifter is collapsed and it might not be a lifter. You won't know what it is until you pull the valve cover and check the rockers/pushrods. Do the easy troubleshooting 1st.
Last edited by midnight01; 05-09-2016 at 04:50 PM.
#11
Melting Slicks
Thread Starter
Ok guys one more video. I believe this noise has slightly increased. Valve covered was pulled and nothing out of the ordinary. If this is a lifter then should I park the car until it's fixed or is it not that big of a risk to drive? Again, noise goes away once motor is warmed up. Here is the vid
Last edited by bwill03z; 07-01-2016 at 06:31 PM.
#12
Drifting
Member Since: Nov 2011
Location: Summerville South Carolina
Posts: 1,401
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I am on my second C5 and
Ok guys one more video. I believe this noise has slightly increased. Valve covered was pulled and nothing out of the ordinary. If this is a lifter then should I park the car until it's fixed or is it not that big of a risk to drive? Again, noise goes away once motor is warmed up. Here is another video from today
https://youtu.be/n6ru6Lpk22Y
https://youtu.be/n6ru6Lpk22Y
Dave
#13
Melting Slicks
Thread Starter
both sound like that when cold. This one has headers and they either amplify or increase the ticking sound. Goes away when hot. Since they both did it, I chalk it up to an engine characteristic and drive it like I stole it. Puts out dyno RWHP 342 and BHP 394+ or-, so I have to get on it alot to keep up with the Mustangs in our muscle car club. Runs right up to redline, idles smoothly at 550 and runs like a scalded dog, so why worry? If it blows, we'll put it back together!
Dave
Dave
#14
Pro
Ok guys one more video. I believe this noise has slightly increased. Valve covered was pulled and nothing out of the ordinary. If this is a lifter then should I park the car until it's fixed or is it not that big of a risk to drive? Again, noise goes away once motor is warmed up. Here is another video from today
https://youtu.be/n6ru6Lpk22Y
https://youtu.be/n6ru6Lpk22Y
#15
Melting Slicks
Thread Starter
if the noise goes away when the car is warmed up it is a clearance issue. A bad lifter will tick like that all the time hot or cold. I had a bad lifter in my Z28 that would make that noise hot or cold. get a stethoscope or a tube that you can press up to a few places so you can try and single out exactly which cylinder is the issue. Then you can check the preload on the rockers and also spin the pushrods to see if they are bent.
#16
Pro
Time causes clearance issues, spirited driving, e.t.c. back in the old days (lol) if you didn't have polylocks for your rocker arms they would have to be adjusted every 20-40K miles because the bolts loosen up over time due to vibration and high rpm driving. a bent pushrod when cold would also have different clearance. I'm not saying it is a bent pushrod just don't rule it out and not check them.
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#17
Melting Slicks
Thread Starter
So I was looking into this noise again. I used a screwdriver and tried to pinpoint where the clacking sound is coming from and it is def not coming from under the valve covers, but more of where the arrow is in the pic ( see below) thoughts??
#19
Melting Slicks
Thread Starter
If so, what's the solution for this? That is probably why I had excessive metal shavings on my magnetic drain plug on my last oil change. It was the first change with the mag plug so I can't compare to any previous oil changes.
#20
Team Owner
Ideally pull engine and clean contamination, replace all bearings.