Clicking/rattle sound
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Joined: 09-18-15
Posts: 747
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From: Battle Creek, MI
Clicking/rattle sound
So guys, I have a fun one. Haven't dug into it yet, but the car is getting parked for the year so I have time to go through it
Went to pick the kids up from school, and I noticed there is a rattle coming from under the car/under the front between 1400-2000rpm. It seems load dependant to a point, throttle too light or heavy and it disappears. It does seem to go up slightly with RPM, but again stops fairly quick.
It'll have to wait until I get it up to check exactly where it's coming from, but so far clutch in or out has no change(Edit: At Idle, off throttle no noise anyway), there is no rattle at startup/shutdown or tapping gas, and car drives fantastic and no obvious issues are noticeable. It has been <45k since the entire timing set was replaced including the VVT items.
Any ideas on things to check? I know it could be a shield, but just looking for ideas before I tear into it.
*Edited info.
Went to pick the kids up from school, and I noticed there is a rattle coming from under the car/under the front between 1400-2000rpm. It seems load dependant to a point, throttle too light or heavy and it disappears. It does seem to go up slightly with RPM, but again stops fairly quick.
It'll have to wait until I get it up to check exactly where it's coming from, but so far clutch in or out has no change(Edit: At Idle, off throttle no noise anyway), there is no rattle at startup/shutdown or tapping gas, and car drives fantastic and no obvious issues are noticeable. It has been <45k since the entire timing set was replaced including the VVT items.
Any ideas on things to check? I know it could be a shield, but just looking for ideas before I tear into it.
*Edited info.
Last edited by Tdubbs; Oct 8, 2024 at 10:15 PM.
Thread Starter
Senior Member
Joined: 09-18-15
Posts: 747
Likes: 96
From: Battle Creek, MI
Car up on stands, and so far I've narrowed where the sound comes from. Seems to be front side of engine, need to dig further but being as I am the only one who can drive stick it makes it a pain.
I had it in third gear on the stands, and just had her tap the throttle a few times, and it seems to be in the area of the timing chain.
I had it in third gear on the stands, and just had her tap the throttle a few times, and it seems to be in the area of the timing chain.
Thread Starter
Senior Member
Joined: 09-18-15
Posts: 747
Likes: 96
From: Battle Creek, MI
Just so nobody is hanging for an answer, I got sent out to Utah for a machine install so no info this week. I'm on vacation next week so plenty of time to tear it down.
I did have a quick minute to pop the valve cover off Sunday night, and the lobes for Cyl.1 on the intake cam looked a little scoured, and I did notice the top chain guide was shifting around on it's bracket.
I did have a quick minute to pop the valve cover off Sunday night, and the lobes for Cyl.1 on the intake cam looked a little scoured, and I did notice the top chain guide was shifting around on it's bracket.
Thread Starter
Senior Member
Joined: 09-18-15
Posts: 747
Likes: 96
From: Battle Creek, MI
Forgot to do this until now, but solved the issue.
It seems the timing chain tensioner was still strong enough to not rattle when mostly load free or starting, but once load was applied to the engine it gave up enough the chain would start slapping on the top guide. (theory based on noise location)
Before tearing it apart further I figured just try a tensioner quick and it has been quiet since. I'm still thinking of just going through everything to be on the safe side, only because I still don't like the marks on the rockers/cam lobes for cylinder 1-2 on intake and 2-3 on exhaust side.
Maybe I'll use it as an excuse to rebuild the head, we'll see.
It seems the timing chain tensioner was still strong enough to not rattle when mostly load free or starting, but once load was applied to the engine it gave up enough the chain would start slapping on the top guide. (theory based on noise location)
Before tearing it apart further I figured just try a tensioner quick and it has been quiet since. I'm still thinking of just going through everything to be on the safe side, only because I still don't like the marks on the rockers/cam lobes for cylinder 1-2 on intake and 2-3 on exhaust side.
Maybe I'll use it as an excuse to rebuild the head, we'll see.
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