99% sure it's a stuck valve, what do you think?
#1
99% sure it's a stuck valve, what do you think?
Last week purchased a 92 civic d15b7 and noticed it was puttering at idle and gutless as a stuck pig. Don't know who but someone forgot to put in the spark plug seals in the valve cover and so the plug recesses were full of oil. I figured this was the problem so I got new plugs, wires, cap, rotor, valve cover gasket kit, and went to work. Relashed the valves while I had the cover off also. Ran better afterwards but still had the putter around idle.
Did a compression test today, found out what the problem is, #2 cyl has no compression. I believe only a stuck valve or a hole in the piston could cause this kind of difference in numbers. Engine is tired (280xxx) but I just need it to pass emissions for winter is all (which it failed miserably)
My results:
Cyl #1
Cyl #3
Cyl #4
Cyl #2 (w/o oil)
Cyl #2 (w/ oil)
Spark plugs with their corresponding cylinder (around 170 miles on them)
Did a compression test today, found out what the problem is, #2 cyl has no compression. I believe only a stuck valve or a hole in the piston could cause this kind of difference in numbers. Engine is tired (280xxx) but I just need it to pass emissions for winter is all (which it failed miserably)
My results:
Cyl #1
Cyl #3
Cyl #4
Cyl #2 (w/o oil)
Cyl #2 (w/ oil)
Spark plugs with their corresponding cylinder (around 170 miles on them)
#2
B*a*n*n*e*d
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Re: 99% sure it's a stuck valve, what do you think?
It could be minor, it could be major. The only way for you to know is to take the head off and look. I don't think a "stuck valve" is even possible - if the valve doesn't move, the cam either would be able to rotate, or would snap the valve in half.
#5
Seagull Management
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Re: 99% sure it's a stuck valve, what do you think?
That said I highly doubt it's a stuck valve, if you want to check pull the valve cover and turn the engine over with a bar and watch the valves for that cylinder, if they all open and close you'll have to pull the head and check for a burnt valve, blown headgasket, broken piston, broken rod, etc.
#6
Honda-Tech Member
Re: 99% sure it's a stuck valve, what do you think?
If you have a compression tester and an air compressor you can make a leak down tester. Google can give you directions.
#7
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Re: 99% sure it's a stuck valve, what do you think?
A leakdown tester would point you in the right direction, but won't be 100%. Regardless, the motor will need to come apart to fix whatever the problem is, so this is one of those moments where it's safe to skip the leakdown and go straight to teardown.
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#8
Re: 99% sure it's a stuck valve, what do you think?
Thank you very much for the reply's everyone.
You may be right about it being bottom end. I am just hoping that it is in the head, thats a lot easier and I really dont feel like pulling the engine.
I'm afraid to pull the head off for what I will find, opening a box of frogs.
That said I highly doubt it's a stuck valve, if you want to check pull the valve cover and turn the engine over with a bar and watch the valves for that cylinder, if they all open and close you'll have to pull the head and check for a burnt valve, blown headgasket, broken piston, broken rod, etc.
I'm afraid to pull the head off for what I will find, opening a box of frogs.
#9
Re: 99% sure it's a stuck valve, what do you think?
Bingo
Finally got around to pulling the head. Ordered a new 200$ head from nwcylinderheads on ebay. Machine shop wanted 250$ to do the job and like 15$ per valve to replace if bad. From the looks of things I probably woulda been upwards of 300$.
Finally got around to pulling the head. Ordered a new 200$ head from nwcylinderheads on ebay. Machine shop wanted 250$ to do the job and like 15$ per valve to replace if bad. From the looks of things I probably woulda been upwards of 300$.
#10
B*a*n*n*e*d
Re: 99% sure it's a stuck valve, what do you think?
Wow, those valves look ancient. See people, this is why i say USE SEAFOAM! It will burn off those carbon deposits, and your engine will run loads better and more efficiently. this is first hand proof that engines gum up and need to be cleaned.
#11
Re: 99% sure it's a stuck valve, what do you think?
But you take the good with the bad. Replacing an O2 sensor is a lot more attractive.
Ironically, that cylinder's piston is immaculately clean. Explain that one to me?
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Re: 99% sure it's a stuck valve, what do you think?
That valve has been burnt for a while, I'd say more likely it looks like that because it's got no compression on that cylinder and the air fuel mixture isn't burning very efficiently than it is that all that crud lead to a burnt valve. If you look at the cylinder to the right you'll notice how much cleaner the valves are.
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