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2008 Honda accord no compression 3rd cylinder.


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aztec
User

Sep 12, 2022, 7:01 AM

Post #1 of 6 (473 views)
2008 Honda accord no compression 3rd cylinder. Sign In

I have a 2008 Honda accord with a 4 cylinder motor. It has 30 pounds of compression in 3rd cylinder the rest are 180. It starts fine but vtc rattles at start up. I'm thinking broken valve but I've never worked no a Honda before. Is there anything I should consider before removing the head.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 12, 2022, 7:03 AM

Post #2 of 6 (471 views)
Re: 2008 Honda accord no compression 3rd cylinder. Sign In

Broken valve? If it dropped a valve it would have destroyed the piston and engine by now.

You would need to do a leakdown test on that cylinder to determine if it's a valve problem.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



aztec
User

Sep 12, 2022, 9:54 AM

Post #3 of 6 (454 views)
Re: 2008 Honda accord no compression 3rd cylinder. Sign In

Sounds like a good idea I'll do that next but I was wandering if there was a component on the engine that would cause a loss of in just one cylinder. I would think the VTC gear would affect all four cylinders. But this is the first Honda I've worked on. I looked at the Piston with a camera it looked good.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 12, 2022, 10:46 AM

Post #4 of 6 (438 views)
Re: 2008 Honda accord no compression 3rd cylinder. Sign In

There is no magic 8 ball or shortcut for this. Testing is what tells you where the problem is. Once you determine if it's actually a valve problem, then we look in that area.

You bring that cylinder up to TDC on compression stroke and then pressurized the cylinder with air and listen for where it leaks out.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Sep 12, 2022, 10:48 AM)


aztec
User

Sep 17, 2022, 7:01 PM

Post #5 of 6 (398 views)
Re: 2008 Honda accord no compression 3rd cylinder. Sign In

Cylinder 3 on top dead center has 30 percent loss at 100 psi. Other Cylinders were at 10 percent loss.the air loss is coming out the intake and exhaust out the other Cylinders. No air from oil tub or coolant reservoir.


Hammer Time
Ultimate Carjunky / Moderator
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Sep 17, 2022, 7:05 PM

Post #6 of 6 (395 views)
Re: 2008 Honda accord no compression 3rd cylinder. Sign In

That pretty much tells you that you have a valve problem.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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