Engine Noise Diagnosis?
Thread Starter
Intermediate
Joined: Feb 2020
Posts: 46
Likes: 28
Engine Noise Diagnosis?
Edit! Just an updated, if anyone was curious, it was a broken exhaust manifold bolt! $400 fix, got the car aligned, new battery (dead because I didn't drive it for 3 weeks), $700 total repair. Going in on Tuesday.
Hey folks! Trying to diagnose some engine noise. Sounds like a mix of something whining, belt noise, intake, idk what. Most prevalent from 2K - 3Kish rpm. Any ideas?
Car has brand new quality belts and a new harmonic balancer. Its louder when its cold, and gets quieter once its warmed up but doesn't completely disappear. Doesn't seem to get faster with RPM, just louder.
Edit: 2nd better sound clip. You can hear it clearly at 40 seconds in when I bounce around 2 - 3k rpm. Sound recorder sitting right next to the engine on the passenger side, near the fuse box.
First 15 seconds here you can hear it when driving:
Hey folks! Trying to diagnose some engine noise. Sounds like a mix of something whining, belt noise, intake, idk what. Most prevalent from 2K - 3Kish rpm. Any ideas?
Car has brand new quality belts and a new harmonic balancer. Its louder when its cold, and gets quieter once its warmed up but doesn't completely disappear. Doesn't seem to get faster with RPM, just louder.
Edit: 2nd better sound clip. You can hear it clearly at 40 seconds in when I bounce around 2 - 3k rpm. Sound recorder sitting right next to the engine on the passenger side, near the fuse box.
First 15 seconds here you can hear it when driving:
Last edited by BigBabyMoses06; May 14, 2021 at 06:58 PM.
Le Mans Master
Joined: Jul 2010
Posts: 5,986
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https://www.youtube.com/watch?v=TAPu3Qny18Y
Hey folks! Trying to diagnose some engine noise. Sounds like a mix of something whining, belt noise, intake, idk what. Most prevalent from 2K - 3Kish rpm. Any ideas?
Car has brand new quality belts and a new harmonic balancer. Its louder when its cold, and gets quieter once its warmed up but doesn't completely disappear. Doesn't seem to get faster with RPM, just louder.
Hey folks! Trying to diagnose some engine noise. Sounds like a mix of something whining, belt noise, intake, idk what. Most prevalent from 2K - 3Kish rpm. Any ideas?
Car has brand new quality belts and a new harmonic balancer. Its louder when its cold, and gets quieter once its warmed up but doesn't completely disappear. Doesn't seem to get faster with RPM, just louder.
Le Mans Master
Joined: Jul 2010
Posts: 5,986
Likes: 719
7th Gear
Joined: Apr 2021
Posts: 7
Likes: 0
was the noise there, before you replaced the parts?? not 100% sure if yours has automatic belt tensioner or bolt type adjustment one??? I just got my Vette Saturday, but am a autotech and would be looking at the belt being too tight....
Thread Starter
Intermediate
Joined: Feb 2020
Posts: 46
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In the 2nd clip, in the first 15 seconds, its the kind of screechy noise that shows up. 3 seconds in and then very clearly at 7-10 seconds in.
And then in the first video, from 1:15 - 1:30, you can hear it mid rev, but Its most noticeable under load like in the first clip.
Last edited by BigBabyMoses06; Apr 12, 2021 at 08:39 PM.
7th Gear
Joined: Apr 2021
Posts: 7
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take the belts completely off and run it without them totally for few and see if you hear it still....thats how I diagnose engine noises or any kind of funny noise from front of engines. 25 year ASE and NISSAN tech veteran....at NISSAN dealership......
Last edited by C6-PHIL-NH; Apr 12, 2021 at 09:16 PM.
Thread Starter
Intermediate
Joined: Feb 2020
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https://imgur.com/jHpOeKF
https://imgur.com/7QYbW1f
Last edited by BigBabyMoses06; May 1, 2021 at 05:39 PM.
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Thread Starter
Intermediate
Joined: Feb 2020
Posts: 46
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Just an updated, if anyone was curious, it was a broken exhaust manifold bolt! $400 fix, got the car aligned, new battery (dead because I didn't drive it for 3 weeks), $700 total repair. Going in on Tuesday.
Thread Starter
Intermediate
Joined: Feb 2020
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Yeah, the rear most bolt next to the firewall. They said $400 max, with parts (gaskets / bolts), said its a pain to get to and could take up to 4 hours max. Idk, I thought that seemed fair but hopefully its less. Just watched a few videos and it actually doesn't look very hard at all.
Last edited by BigBabyMoses06; May 14, 2021 at 11:32 PM.
Melting Slicks
Joined: Nov 2011
Posts: 3,164
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From: Virginia
Yeah, the rear most bolt next to the firewall. They said $400 max, with parts (gaskets / bolts), said its a pain to get to and could take up to 4 hours max. Idk, I thought that seemed fair but hopefully its less. Just watched a few videos and it actually doesn't look very hard at all.
Thread Starter
Intermediate
Joined: Feb 2020
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Bolt sheered in half, not sure where it sheered exactly but they have to extract it. I unfortunately do not have the time or tools to attempt at the moment. I appreciate the feedback!
Melting Slicks
Joined: Nov 2011
Posts: 3,164
Likes: 258
From: Virginia
