engine knock
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Heel & Toe
Joined: Feb 2006
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engine knock
I have a stock 350. I have noticed recently there is a knock in the engine starting to be heard. When the engine is cold, you can't hear it. As it warms up it gets louder. I am a novice at this! Any suggestions? Thanks
Thread Starter
Heel & Toe
Joined: Feb 2006
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Thread Starter
Heel & Toe
Joined: Feb 2006
Posts: 16
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Thread Starter
Heel & Toe
Joined: Feb 2006
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Melting Slicks
Joined: Jul 2004
Posts: 3,291
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From: Avon, Indiana
What year is your car? My 80 was pinging under load only after it was warmed up. Turned out the vacuum hose to EGR was hooked up wrong.
If a later model, check that the doors in the horns on the air cleaner open once the engine is warmed up.
If a later model, check that the doors in the horns on the air cleaner open once the engine is warmed up.
Thread Starter
Heel & Toe
Joined: Feb 2006
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knocks
The vet is a 75, It was also suggested that I un hook the EGR. Thanks
Team Owner
Joined: Aug 2004
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From: Hamburger Hill...MAY 69
St. Jude Donor '08
Team Owner
Joined: Aug 2006
Posts: 24,125
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From: Columbia Missouri
I full aware that a rod bearing may be a long shot considering none of us can hear it in person. It's so hard to determine what someone else calls a knock, when it may be a ping, clatter, slap...whatever.
It may not be a rod bearing...it's just something to consider as he goes over the findings and symptoms.
Team Owner
Joined: Aug 2004
Posts: 22,437
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From: Hamburger Hill...MAY 69
St. Jude Donor '08
:
With so many metal to metal parts making contact ...Ive had a faulty mechanical fuel pump sound like a busted wrist pen..
I full aware that a rod bearing may be a long shot considering none of us can hear it in person. It's so hard to determine what someone else calls a knock, when it may be a ping, clatter, slap...whatever.
It may not be a rod bearing...it's just something to consider as he goes over the findings and symptoms.
It may not be a rod bearing...it's just something to consider as he goes over the findings and symptoms.
With so many metal to metal parts making contact ...Ive had a faulty mechanical fuel pump sound like a busted wrist pen..
Advanced
Joined: Jan 2007
Posts: 51
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From: West Jordan Ut
If its a rod bearing, It will show up in the oil presure. If the oil presure drops at an idle (when the engine is up to operating temp) & increses with rpm thats a good indication of a rod bearing problem.
Racer
Joined: Jul 2003
Posts: 455
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From: Buffalo New York
Instructor
Joined: Jul 2006
Posts: 206
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From: Washington DC
hate to say it, but sounds like you've got a thrown rod... is the oil pressure reading normal? drain the oil and look for any shavings also. If the sound gets worse or louder when you rev its probably a thrown rod... If this is a daily driver and you need it for work, find out which cylinder(s) is/are knocking by pulling the fuel and spark plug from each one until the noise goes away. Leave the plugs and fuel cut from the bad cylinders... it will be LOUD and annoying as hell, but it will keep it going a little longer...
If your engine is carbed I have no idea how or even if you can cut the fuel to individual cylinders...
If your engine is carbed I have no idea how or even if you can cut the fuel to individual cylinders...
Last edited by karioth; Feb 14, 2007 at 03:29 PM.
Burning Brakes
Joined: Sep 2006
Posts: 851
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From: Palm City, FL
The oil pressure on my vette goes down at idle and up with rpm... and I have no rod bearing issues with it.
I also had a rod knocking on my truck and never noticed the oil pressure doing anything out of the ordinary as the oil pressure goes up and down on this depending on rpm too... even before the rod issue.
On my 99 Camaro same thing.... no rod bearing issues, but the oil pressure goes up and down with rpm.
Is the oil pressure changes somehow differnet than what you might see normally?
Melting Slicks
Joined: Aug 2003
Posts: 2,135
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From: Dayton Oh
Pull the valve covers and check to see if a broken spring, bent push rod, etc.