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Compression Test Result HELP??

 
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Old 09-01-2011, 01:55 AM
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Icon5 Compression Test Result HELP??

I have a 2001 Prelude SH at almost 99,000miles. I live in 92277. The test was self done after the engine was driven.
Cyl 1: dry: 190
Cyl 2: dry: 110
Cyl 3: dry: 173
Cyl 4: dry: 95 wet: 120

What does this mean? Can low compression cause a misfire? How do i bring up the compression back to normal, or atleast close to it?
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Old 09-01-2011, 03:25 AM
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Re: Compression Test Result HELP??

Please help :(
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Old 09-01-2011, 03:35 AM
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Re: Compression Test Result HELP??

People say to do these at WOT. If these results are correct, it means your engine is about as healthy as a 90 year old diabetic on a sugar binge.

Could be the head gasket leaking compression or, more likely, your piston rings are fried.
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Old 09-01-2011, 03:48 AM
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Re: Compression Test Result HELP??

Yeah i did this WOT. Will a valve adjustment/clearance play a roll in a low compression result? Coz it hasnt been since whenever the first buyer did it, thats if he even did one.
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Old 09-01-2011, 03:56 AM
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Re: Compression Test Result HELP??

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Originally Posted by eMTy1989 View Post
Yeah i did this WOT. Will a valve adjustment/clearance play a roll in a low compression result? Coz it hasnt been since whenever the first buyer did it, thats if he even did one.
A valve adjustment is crucial to compression. If the valves are too tight, they can be stuck open all the time and will leak compression like crazy.
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Old 09-01-2011, 04:04 AM
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Re: Compression Test Result HELP??

Which could throw the possibility of cylinder 4 to be low coz maybe the valves on its side is tighter than the others? Im not leaking oil externally.
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Old 09-01-2011, 09:34 AM
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Re: Compression Test Result HELP??

Do a leakdown test next, it'll tell you exactly where you're losing compression.
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Old 09-01-2011, 10:01 AM
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Re: Compression Test Result HELP??

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Originally Posted by jkoni426 View Post
Do a leakdown test next, it'll tell you exactly where you're losing compression.

^^ this.

but the fact that the numbers increase after a cap-full of oil points to the piston rings. you may not be LEAKING oil, but you could be BURNING it. do you ever see a blue cloud behind you when accelerating? or eating oil abnormally fast?
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Old 09-01-2011, 12:08 PM
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Re: Compression Test Result HELP??

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Originally Posted by twokexlv6coupe View Post
^^ this.

but the fact that the numbers increase after a cap-full of oil points to the piston rings. you may not be LEAKING oil, but you could be BURNING it. do you ever see a blue cloud behind you when accelerating? or eating oil abnormally fast?
I still got to do a wet test on the remaining cylinders. So if they all increase in compression during the wet test, means that theres know leak??? I dont see a blue cloud when im accelerating, to my knowledge. But after i changed my oil and put the correct amount, a couple weeks later my dipstick reading is below than what i put in, from the initial time i checked it right after i changed the oil. But ive heard that preludes burn oil as the engine gets older by mileage. How would i be able to prevent this? Im guessing id have to buy a new engine or rebuild it.
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Old 09-01-2011, 12:10 PM
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Re: Compression Test Result HELP??

Quote:
Originally Posted by jkoni426 View Post
Do a leakdown test next, it'll tell you exactly where you're losing compression.
How much does a leakdown test run, specially in CA?
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Old 09-01-2011, 12:13 PM
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Re: Compression Test Result HELP??

Can someone put the valve lash adjustment DIY thread on here? Ive seen it on here but now i cant find it anymore. Please and thank you.
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Old 09-01-2011, 12:54 PM
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Re: Compression Test Result HELP??

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Old 09-01-2011, 01:03 PM
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Re: Compression Test Result HELP??

valve adjustment is in the helms maual, find it in the 5g resource section
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Old 09-02-2011, 02:41 AM
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Re: Compression Test Result HELP??

Tried to attempt the valve adjustment. Wasnt successful bcoz its a tight fit in the engine, couldnt hold the adjusting screw and at the same time tighten the locking bolt. Even if i woulda gotten rid of the camshaft holder/cover. The locking bolt ad screw was lower than the camshaft. So it took me 8+ hrs to only manage to i think correctly or close to the gaps specs on 2-4 valves. The rest i left the same. On that not:

(All Checked Before Attempt)
cyl 1
intake: 1 gap, the other no gap
exhaust: 1 gap and the other not.

Cyl 2:
Intake: both gapped
Exhaust: 1 gapped, the other no gap

Cyl 3:
Intake: no gaps
Exhaust: 1 gap, 1 not gapped

Cyl 4:
Intake: No gaps
Exhaust: 1 gap, the other no gap.
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Old 09-02-2011, 03:09 AM
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Re: Compression Test Result HELP??

They make a special tool to adjust the valves on a VTEC equipped engine. Those valves are crucial.
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Old 09-02-2011, 12:47 PM
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Re: Compression Test Result HELP??

with the right tools valve adjustment shouldnt take more than an hour

if you need to take it to a shop and can get it to palm springs i know the best prelude mechanic out here
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Old 09-02-2011, 01:54 PM
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Re: Compression Test Result HELP??

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Originally Posted by RandallSharp View Post
They make a special tool to adjust the valves on a VTEC equipped engine. Those valves are crucial.
Do u know what tool that is?
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Old 09-02-2011, 01:56 PM
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Re: Compression Test Result HELP??

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Originally Posted by UntoTheCruel View Post
with the right tools valve adjustment shouldnt take more than an hour

if you need to take it to a shop and can get it to palm springs i know the best prelude mechanic out here
How much do u think he'll do the valve lash adjustment for? Do you mind if i can get his number and ur name so i can tell him you referred me? PM me
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Old 09-02-2011, 01:57 PM
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Re: Compression Test Result HELP??

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Originally Posted by eMTy1989 View Post
Do u know what tool that is?
Don't quote me on this, but I'm pretty sure this is it:

Amazon.com: Schley (SCH88800) 12mm Jam Nut Valve Adjustment Tool: Home Improvement
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Old 09-02-2011, 01:59 PM
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Re: Compression Test Result HELP??

Can someone please break it down and tell me what a "Slight Drag" means when gapping the valves to the proper feeler on a valve lash adjustment?
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Old 09-02-2011, 02:01 PM
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Re: Compression Test Result HELP??

Quote:
Originally Posted by RandallSharp View Post
Don't quote me on this, but I'm pretty sure this is it:

Amazon.com: Schley (SCH88800) 12mm Jam Nut Valve Adjustment Tool: Home Improvement

Do u noe what stores i can buy thus from?
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Old 09-02-2011, 02:02 PM
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Re: Compression Test Result HELP??

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Originally Posted by eMTy1989 View Post
Can someone please break it down and tell me what a "Slight Drag" means when gapping the valves to the proper feeler on a valve lash adjustment?
It's really a matter of experience. It means the feeler gauge can move freely between the lobe and rocker, but you can feel it being tugged slightly. Just a little amount of resistance. Nothing that should cause the gauge to bend, but enough so you have to give a little effort. I always double check with 1 size lower and 1 size higher to ensure I'm in spec.

EDIT: You could theoretically buy it from amazon if it is the right tool? I'm NOT saying it is.
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Old 09-02-2011, 02:15 PM
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Re: Compression Test Result HELP??

Yeah i did the same with 1 gauge higher and lower. With the proper gauge it moves back and forth with a slight rub, with 1 gauge higher itll fit but u can hear the rub and id have to slightly pull it out. Should it be that itll fit the proper gauge and the gauge higher shouldnt even fit through without forcing it through?
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Old 09-02-2011, 03:31 PM
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Re: Compression Test Result HELP??

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Originally Posted by RandallSharp View Post
It's really a matter of experience. It means the feeler gauge can move freely between the lobe and rocker, but you can feel it being tugged slightly. Just a little amount of resistance. Nothing that should cause the gauge to bend, but enough so you have to give a little effort. I always double check with 1 size lower and 1 size higher to ensure I'm in spec.

EDIT: You could theoretically buy it from amazon if it is the right tool? I'm NOT saying it is.
Should it be that the proper feeler gauge will fit, but 1 feeler gauge higher wont even fit through unless u have to try and force it through?
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Old 09-02-2011, 09:14 PM
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Re: Compression Test Result HELP??

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Originally Posted by eMTy1989 View Post
Should it be that the proper feeler gauge will fit, but 1 feeler gauge higher wont even fit through unless u have to try and force it through?
Pretty much. I make sure the spec gauge drags and 1 higher doesn't fit.
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