C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

C5 LS1 Engine noise HELP! (with vid)

Thread Tools
 
Search this Thread
 
Old Jul 21, 2013 | 01:08 PM
  #1  
Grantendo's Avatar
Grantendo
Thread Starter
7th Gear
 
Joined: Jul 2013
Posts: 7
Likes: 0
From: Pensacola FL
Default C5 LS1 Engine noise HELP! (with vid)

Hey guys, I am relativily new to the LS1 community. I just bought this 99 c5 targa about three weeks ago. After some spirited driving, it started making this noise:


Could it be a bad cat? It has been stalling on me and while we were installing a new exhaust, my friend pointed up that a rattle (like marbles in a tin can) was coming from near the cat. However, this sounds like its coming from the engine. It still makes the noise when I step in the clutch, and when I rev it. Its not really in sync with the revs, but it makes the noise more frequent under more rpms. What could it be??



Thanks guys.

Grant
Reply
Old Jul 21, 2013 | 04:48 PM
  #2  
VinnyT's Avatar
VinnyT
Le Mans Master
15 Year Member
 
Joined: Jan 2007
Posts: 7,364
Likes: 6
From: Rocky Mount Virginia
Default

What kind of oil pessure you running when hot?
Reply
Old Jul 21, 2013 | 06:59 PM
  #3  
thepitstop2010's Avatar
thepitstop2010
Racer
Supporting Lifetime
10 Year Member
 
Joined: Apr 2012
Posts: 282
Likes: 4
From: Dayton Ohio
Default

Any chance the balancer has separated enough to be contacting the steering rack?
Reply
Old Jul 21, 2013 | 07:41 PM
  #4  
Eagle_Gene's Avatar
Eagle_Gene
2nd Gear
 
Joined: Nov 2012
Posts: 2
Likes: 0
From: Pawhuska,Oklahoma
Default

it sounds like either a torque tube coupler or a busted flywheel to me???
Reply
Old Jul 22, 2013 | 09:24 AM
  #5  
warlock007's Avatar
warlock007
Pro
10 Year Member
 
Joined: Aug 2009
Posts: 662
Likes: 0
From: Loxahatchee FL
Default

sounds like the TT, put on lift use stethoscope to pin it down.

also pull the little rubber bell housing piece and with a light look up there and see if anything is loose. engine off first. if its all tight then start and check with scope.

Auto or 6 Speed? auto very possible the torque hub bolt is loose or fell out
Reply
Old Jul 22, 2013 | 07:03 PM
  #6  
Grantendo's Avatar
Grantendo
Thread Starter
7th Gear
 
Joined: Jul 2013
Posts: 7
Likes: 0
From: Pensacola FL
Default

Thanks for all your replies! It turned out to be a bad water pump. I pulled it out and there was a big puddle of water. In the process of putting a new one on now.
Reply

Get notified of new replies

To C5 LS1 Engine noise HELP! (with vid)





All times are GMT -4. The time now is 09:08 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE