What a Bad DAY
Thread Starter
Intermediate
Joined: Feb 2009
Posts: 25
Likes: 0
What a Bad DAY
SO I finally pulled out the corvette from storage today.. Brought it into my garage and replaced the radiator as it was leaking. Which wasnt as bad as I thought it was going to be..
anyways I had a neighbor come over to help me put the hood back on and he asked me if the car was always racing and never idling correctly. I told him yes and he pulled off a hose and then pluged the nipple on the carberator. When he did that the engine calmed right down and idled I thought it was going to be a great thing.... then I heard it.. YUP and knocking in the lower part of the engine.. I think a rod got screwed up or something...
NOW I NEED TO REPLACE THE ENGINE.. I was all excited about driving the car tomorow to work.. that isnt happening now.. DAMMMMMM
Just had to vent..
anyways I had a neighbor come over to help me put the hood back on and he asked me if the car was always racing and never idling correctly. I told him yes and he pulled off a hose and then pluged the nipple on the carberator. When he did that the engine calmed right down and idled I thought it was going to be a great thing.... then I heard it.. YUP and knocking in the lower part of the engine.. I think a rod got screwed up or something...
NOW I NEED TO REPLACE THE ENGINE.. I was all excited about driving the car tomorow to work.. that isnt happening now.. DAMMMMMM
Just had to vent..
Drifting
Joined: Apr 2008
Posts: 1,565
Likes: 2
From: Sparta Mo.
Pull the pan and try to move the rods one by one against the crank. You can feel a loose one even if it only has .005-.010 extra play. With oil on the crank, they shouldn't move at all side to side. They Will slide a little back and forth on the crank. Let it run a little bit. If the knock goes away after it warms up, it could be a wrist pin. If it does go away when it's warm, drive it. They can go like that for years. If it's a rod or main bearing, fix it right now!
Good luck, keep us posted.
Good luck, keep us posted.
Melting Slicks
Joined: Apr 1999
Posts: 2,521
Likes: 4
From: Windham, NH
I have also heard a knocking sound simular to a rod knock that was caused by a bad fuel pump. The pump produced sufficent pressure & volume for the car to run perfect but there was a broken spring inside it that caused the lever to slap the fuel pump push rod and made a sound VERY simular to a rod knock. It might be worth an hour of your time & $30 bucks or so for a new pump to eliminate it as a possiabulaty.
Jim
Jim
Drifting
Joined: Nov 2003
Posts: 1,874
Likes: 7
From: l In
You could have knocked off a piece of carbon on one of the pistons and that is what you are hearing. If a piece of carbon is forced loose at start up and wedges sideways it will sound like a rod knocking. Only cure is to run it out the valve and you will be good to go.
Just my $ .02 worth
Just my $ .02 worth
Racer
Joined: Mar 2005
Posts: 487
Likes: 0
From: Jacksonville FL
you can also test for a bad bearing by tapping on the rod caps with a metal rod. good ones sound fairly solid while bad ones will sound hollow.
good luck and i hope it's not a rod bearing. i wasn't so lucky...
good luck and i hope it's not a rod bearing. i wasn't so lucky...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Le Mans Master
Joined: Jan 2007
Posts: 8,011
Likes: 3,342
From: Omaha NE
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2023 C3 of the Year Finalist - Unmodified
2022 C3 of the Year Finalist - Unmodified
2020 C3 of the Year Finalist - Unmodified
You could have knocked off a piece of carbon on one of the pistons and that is what you are hearing. If a piece of carbon is forced loose at start up and wedges sideways it will sound like a rod knocking. Only cure is to run it out the valve and you will be good to go.
Just my $ .02 worth
Just my $ .02 worth
..
Thread Starter
Intermediate
Joined: Feb 2009
Posts: 25
Likes: 0
I brought it to a shop around here and he said that he doesnt think that it is a rod.. He also doesnt think that its the fuel pump.. He however has no clue what it is though.. Im just gonna drive it.. if it goes ill replace the motor with a 383 stroker that i know of for sale..
Hope everyone has a great weekend..
Greg
Hope everyone has a great weekend..
Greg
