Valve stem vs. valve spring
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Joined: Dec 2018
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Valve stem vs. valve spring
My mechanic told me that my valve stem is bad.
He didn’t actually take a look at it, just said 2 cylinders aren’t running correctly.
whatre the chances he’s wrong and it’s the valve spring instead of the stem.
Its so much easier to replace the spring 😂
or how how can I tell which one it is?
He didn’t actually take a look at it, just said 2 cylinders aren’t running correctly.
whatre the chances he’s wrong and it’s the valve spring instead of the stem.
Its so much easier to replace the spring 😂
or how how can I tell which one it is?
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And how can I tell if it’s the valve stem. Or is that not likely
Team Owner
Joined: Dec 2000
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From: SE NY
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If replacing a spring or two I'd replace them all along with the keepers.
I've heard that if you squirt a little oil into a cylinder and repeat the compression test. If compression drastically improves it's rings, if not it's valve stem.
I've heard that if you squirt a little oil into a cylinder and repeat the compression test. If compression drastically improves it's rings, if not it's valve stem.
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From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
I went back and read through all the prior posts the OP put up. Assuming all is for real, the OP really needs the set of books on basic engine mechanics telling him solutions that require mechanical knowledge is just a waste of keyboard strokes.
https://www.corvetteforum.com/forums...need-help.html
So either the OP is an absolute newb, never ever exposed to a car that didn't start on the first key turn, never had an issue,
or
something else is getting stroked.
https://www.corvetteforum.com/forums...need-help.html
problem: the car won’t start. It clicks like a machine gun. Click click click click click. That used to happen all the time, but the car has been sitting for awhile and now the car doesn’t even turn on (like the dashboard and battery thing). I tried jump starting it and it worked for a little bit but seemed to die again. I don’t know what that could have been or why it’s happening.
The battery is about 2 months old; it’s new.
The battery is about 2 months old; it’s new.
or
something else is getting stroked.
Last edited by drcook; Jul 1, 2019 at 08:23 AM.
Melting Slicks
Joined: May 2013
Posts: 2,692
Likes: 349
From: Sacramento California
I agree, start at the beginning and tell us why you took it to your mechanic in the first place.
You can't simply say that a valve is bad just by confirming a couple misfiring cylinders. I think your mechanic is jerking you.
You can't simply say that a valve is bad just by confirming a couple misfiring cylinders. I think your mechanic is jerking you.
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From: Mission Viejo CA
What we have here is an 18 year old, who has had no exposure to auto mechanics, but is anxious to learn. My best advice: find a local Corvette group, and hope someone has the patience to help you! It's tough for us to figure out a problem, when the problem can't be explained with clarity.
Second suggestion: Fill out the information in your Personal Profile. You may discover there's someone in your home town that would be willing to help you.
Second suggestion: Fill out the information in your Personal Profile. You may discover there's someone in your home town that would be willing to help you.
Thread Starter
Advanced
Joined: Dec 2018
Posts: 71
Likes: 7
What we have here is an 18 year old, who has had no exposure to auto mechanics, but is anxious to learn. My best advice: find a local Corvette group, and hope someone has the patience to help you! It's tough for us to figure out a problem, when the problem can't be explained with clarity.
Second suggestion: Fill out the information in your Personal Profile. You may discover there's someone in your home town that would be willing to help you.
Second suggestion: Fill out the information in your Personal Profile. You may discover there's someone in your home town that would be willing to help you.
i took it to the mechanic because the engine was misfiring and causing backfire. He then told me it was because 2 cylinders weren’t running correctly. He said it was the valve stem. But I think it is just the spring.
Melting Slicks
Joined: May 2013
Posts: 2,692
Likes: 349
From: Sacramento California
Cylinder misfires are generally caused by 3 things: fuel issues, spark issues, low compression. (A valve issue could cause low compression.) But still I don't know how either you or your mechanic can conclude it's a valve / valve spring issue based only on the symptoms of misfire and backfire. Backfire could be caused by the camshaft/lifters/pushrods or a spark or fuel-related issue. It could even be something as simple as spark plug wires switched onto the wrong plugs.
Last edited by DGXR; Jul 1, 2019 at 05:28 PM.
Thread Starter
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Cylinder misfires are generally caused by 3 things: fuel issues, spark issues, low compression. (A valve issue could cause low compression.) But still I don't know how either you or your mechanic can conclude it's a valve / valve spring issue based only on the symptoms of misfire and backfire. Backfire could be caused by the camshaft/lifters/pushrods or a spark or fuel-related issue. It could even be something as simple as spark plug wires switched onto the wrong plugs.