Engine noise video please help
Thread Starter
TECH Apprentice
iTrader: (6)
Joined: Oct 2007
Posts: 371
Likes: 0
From: Newberg Oregon
Engine noise video please help Last edited by smokinponcho73; Mar 17, 2008 at 11:39 PM. Reason: video did not work, fixed now
TECH Addict
Joined: Nov 2005
Posts: 2,379
Likes: 2
If it's louder on the top then the bottom, it's valvetrain.
If it's rod knock it will be loudest from the bottom. The high pitch squeal sounds like pulley.
Also if it is rod knock, there WILL be metal shavings and brass colored bits in the oil. Oil pressure will fluctuate like crazy and drop well below 40 psi or even hit 0.
Also, while the transmission is disconnected, NOT a good thing to start up the car for a test of unusual sounds. Could very well be caused by the fact the transmission is disconnected.
If it's rod knock it will be loudest from the bottom. The high pitch squeal sounds like pulley.
Also if it is rod knock, there WILL be metal shavings and brass colored bits in the oil. Oil pressure will fluctuate like crazy and drop well below 40 psi or even hit 0.
Also, while the transmission is disconnected, NOT a good thing to start up the car for a test of unusual sounds. Could very well be caused by the fact the transmission is disconnected.
Trending Topics
Does it get louder as it warms up? Then it's a rod. Sounds too loud to be an accessory noise but to be sure, pull the belt and run it for a few seconds. How's the oil pressure under load? Sounds like a rod bearing to me though. It's making noise to the rhythm of the engine. That's usually a bearing. Valvetrain noise is usually half speed if it's isolated to one valve.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
#1 check oil for copper shavings
#2 Take front drive belt off and run.
#3 What is the oil presure doing?
It sounds to be coming from the top but like what was said before spun rod will tink the heads. Wish you best with it.
#2 Take front drive belt off and run.
#3 What is the oil presure doing?
It sounds to be coming from the top but like what was said before spun rod will tink the heads. Wish you best with it.
Thread Starter
TECH Apprentice
iTrader: (6)
Joined: Oct 2007
Posts: 371
Likes: 0
From: Newberg Oregon
oil pressure was fine. oh and i know the noise isnt from not having the tranny on there because it made it while i drove it and i was thinking it was the clutch so i pulled the clutch and thought we better start it to make sure the clutch was the noise unfortunatly it wasnt
TECH Addict
Joined: Nov 2005
Posts: 2,379
Likes: 2
I've got tapping way louder than that when my lifters start acting up... It gets loud enough to hear over the radio while cranked and driving at 70mph.
I've got great oil pressure and no metal shavings, used oil analysis after the fact is fine. It's louder at the top than the bottom. A little oil treatment for noisy lifters with German Castrol 0w30 quiets mine down.
If there's no metal shavings in the oil AND the pressure is fine and healthy, I'd go with collapsing lifter. Heck even piston slap makes an ungodly noise almost as bad.
Pulley sounds like it's on it's way out, disconnect the belt and try to figure out which one isn't spinning smoothly. Belt tensioner pulley and A/C idler pulley are likely culprits.
I've got great oil pressure and no metal shavings, used oil analysis after the fact is fine. It's louder at the top than the bottom. A little oil treatment for noisy lifters with German Castrol 0w30 quiets mine down.
If there's no metal shavings in the oil AND the pressure is fine and healthy, I'd go with collapsing lifter. Heck even piston slap makes an ungodly noise almost as bad.
Pulley sounds like it's on it's way out, disconnect the belt and try to figure out which one isn't spinning smoothly. Belt tensioner pulley and A/C idler pulley are likely culprits.
Thread Starter
TECH Apprentice
iTrader: (6)
Joined: Oct 2007
Posts: 371
Likes: 0
From: Newberg Oregon
would i be able to tell if a lifter has collapsed without pulling the intake, i got the valve cover off im about to pull out the pushrods and see if they are bent Thanks
I had a spun bearing on my older LS1 and it doesn't sound quite like that from what I remember. I jus' recently had a problem with my 3.8L V6 Daily Driver and it sounds jus' like that. Took it to a friend and said it was a lifter problem. After a few minutes of idle the noise goes away. I'm betting it's a lifter.
Also check the oil drain plug like everyone's said. If there is no metal shavings, I can't possibly see it being a spun bearing.
Also check the oil drain plug like everyone's said. If there is no metal shavings, I can't possibly see it being a spun bearing.
