Go Back   Honda-Tech > Honda and Acura Model-Specific Technical Forums > Honda Accord & Crosstour (2003 - Current)
Sign in using an external account
Register Forgot Password?
Search


Welcome to Honda-Tech!
Welcome to Honda-Tech.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Honda-Tech community today!


Reply
 
 
 
submit to reddit
 
Thread Tools Search this Thread
Old 01-24-2011, 10:25 AM   #1
djh781997
Trial User
Garage is empty, add now
 
djh781997's Avatar
 
Join Date: Jan 2011
Location: Cali
Posts: 6
iTrader Rating: (0)
Default Pressure when removing oil cap

So I have a 2006 Accord 2.4 and I recently noticed that when I remove the oil fill cap while the engine is running, a lot of air comes out. It sounds like a second exhaust system coming out of the valve cover. Sounds like the valve cover has an aftermarket muffler. LOL There is no smoke coming out, just air. I am very experienced with engines and how they work so please do not tell me that this is blow by, PCV valve or plugged cat. I have not noticed any power loss, millage loss or change in how the car runs. The car has 140,000 miles on it and I service it religiously. If anyone has any ideas can you please help me out.
djh781997 is offline   Reply With Quote
Old 01-24-2011, 10:28 AM   #2
GoLowDrew
Member
Garage is empty, add now
 
GoLowDrew's Avatar
 
Join Date: Dec 1999
Posts: 39,325
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Quote:
Originally Posted by djh781997 View Post
So I have a 2006 Accord 2.4 and I recently noticed that when I remove the oil fill cap while the engine is running, a lot of air comes out. It sounds like a second exhaust system coming out of the valve cover. Sounds like the valve cover has an aftermarket muffler. LOL There is no smoke coming out, just air. I am very experienced with engines and how they work so please do not tell me that this is blow by, PCV valve or plugged cat. I have not noticed any power loss, millage loss or change in how the car runs. The car has 140,000 miles on it and I service it religiously. If anyone has any ideas can you please help me out.
Why would you do that? Keep that cap on while the engine is running. Your car is fine.
GoLowDrew is offline   Reply With Quote
Old 01-24-2011, 10:45 AM   #3
djh781997
Trial User
Garage is empty, add now
 
djh781997's Avatar
 
Join Date: Jan 2011
Location: Cali
Posts: 6
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

That is one of the tests I do on every car I check out/work on. Very fast and simple way to hear what the top end sounds like. No other car has ever done this. I have checked another 2.4 Accord and it does not do what mine does. I expressed in my post that I am VERY experienced with engines and I am looking for an experienced answer.
djh781997 is offline   Reply With Quote
Old 01-24-2011, 10:54 AM   #4
GoLowDrew
Member
Garage is empty, add now
 
GoLowDrew's Avatar
 
Join Date: Dec 1999
Posts: 39,325
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Ok, I was afraid that (newbies) would try this, and maybe have oil splash out. Carry on.
GoLowDrew is offline   Reply With Quote
Old 01-24-2011, 11:05 AM   #5
djh781997
Trial User
Garage is empty, add now
 
djh781997's Avatar
 
Join Date: Jan 2011
Location: Cali
Posts: 6
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Look pal, just because I am a noob on this site don't ever confuse me for being a noob all together. Ive been around engines a long time. This is not normal. Take your oil cap off and tell me what you hear. I guarantee you will not hear what I hear.
djh781997 is offline   Reply With Quote
Old 01-24-2011, 11:11 AM   #6
90sedan
Honda-Tech Member
Garage is empty, add now
 
90sedan's Avatar
 
Join Date: Jun 2005
Location: WA
Posts: 2,327
iTrader Rating: (0)
Send a message via AIM to 90sedan
Default Re: Pressure when removing oil cap

Excessive crankcase pressure, what else would it be? Perform a cylinder leak down test to confirm.

Quote:
Originally Posted by djh781997 View Post
Look pal, just because I am a noob on this site don't ever confuse me for being a noob all together. Ive been around engines a long time. This is not normal. Take your oil cap off and tell me what you hear. I guarantee you will not hear what I hear.
You misread his posts, he wasn't calling you a noob, he was referring to other people on this site.
__________________
SpeedFactory Tuning and Race Fabrication
90 Ef Sedan
vitara d16
90sedan is offline   Reply With Quote
Old 01-24-2011, 11:13 AM   #7
GoLowDrew
Member
Garage is empty, add now
 
GoLowDrew's Avatar
 
Join Date: Dec 1999
Posts: 39,325
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Don't get offended. You made it clear that you are an experienced person. My use of the word "newbie" was that there would be less experience people trying and experimenting. It was not calling you a newbie.

Do you want to start over? I can clean up this thread.
GoLowDrew is offline   Reply With Quote
Old 01-24-2011, 11:20 AM   #8
djh781997
Trial User
Garage is empty, add now
 
djh781997's Avatar
 
Join Date: Jan 2011
Location: Cali
Posts: 6
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

OK, I'm sorry for the quick come back. I have been trying to find the answer to this for quite some time and all i have been getting is people giving me lame so called fixes. Gets a little frustrating. The best way to describe it is exhaust coming out of the valve cover. I hear all 4 Cly, not just one or two.That leads me to believe it is not a valve prob.
djh781997 is offline   Reply With Quote
Old 01-25-2011, 08:03 AM   #9
LPED
Honda-Tech Member
Garage is empty, add now
 
LPED's Avatar
 
Join Date: Nov 2007
Posts: 135
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

A engine in good shape will have a vacuum on oil cap from PVC system. If your feeling pressure it probably blowby or a PVC issue . you are getting excessive crankcase pressure as other post mentions. you need to check things out .

PS: the car could run fine and have smooth engine if all cylinders have same leakage, so you can't go by that .
Check leak down cylinder test and if PCV system is working ok .Also make sure hose from valve cover to rubber intake hose is clear all the way through .
LPED is offline   Reply With Quote
Old 01-25-2011, 12:18 PM   #10
djh781997
Trial User
Garage is empty, add now
 
djh781997's Avatar
 
Join Date: Jan 2011
Location: Cali
Posts: 6
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Comp. test. Good
Leak down. Good
PCV. Good
EGR. Good
Exhaust flow. Good
djh781997 is offline   Reply With Quote
Old 01-25-2011, 12:53 PM   #11
LPED
Honda-Tech Member
Garage is empty, add now
 
LPED's Avatar
 
Join Date: Nov 2007
Posts: 135
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Quote:
Originally Posted by djh781997 View Post
Comp. test. Good
Leak down. Good
PCV. Good
EGR. Good
Exhaust flow. Good
you say PVC is all good. So do you feel suction on the metal line going to intake rubber intake hose .meaning remove the end of metal pipe going into the large intake hose and while engine is running at idle you feel suction from the metal line that goes to valve cover (with oil cap on ) ?
If you loosen oil cap and rest it over opening does it pulsate up and down over opening with each cylinder firing .
Some engines are much louder with cap off .
LPED is offline   Reply With Quote
Old 01-25-2011, 01:33 PM   #12
Targa250R
be professional
Garage is empty, add now
 
Targa250R's Avatar
 
Join Date: Oct 2002
Location: Pittsburgh, PA
Posts: 14,842
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

So, what exactly is the problem here? I'm not really seeing anything to be concerned about, so I have no idea why you're asking about this.
__________________
1996 Accord | 1998 CB750 | 2001 Integra | 2012 Giant Anthem X29
Targa250R is offline   Reply With Quote
Old 01-25-2011, 01:34 PM   #13
hayabusa160
Honda-Tech Member
1992 Honda Civic
 
hayabusa160's Avatar
 
Join Date: Jul 2003
Location: nj
Posts: 4,145
iTrader Rating: (0)
Send a message via AIM to hayabusa160
Default Re: Pressure when removing oil cap

this is 100% normal. if you do this on any car with the car running you will feel air blowing out of the oil cap. it will also make a pretty loud puffing sound.


Quote:
Originally Posted by djh781997 View Post
So I have a 2006 Accord 2.4 and I recently noticed that when I remove the oil fill cap while the engine is running, a lot of air comes out. It sounds like a second exhaust system coming out of the valve cover. Sounds like the valve cover has an aftermarket muffler. LOL There is no smoke coming out, just air. I am very experienced with engines and how they work so please do not tell me that this is blow by, PCV valve or plugged cat. I have not noticed any power loss, millage loss or change in how the car runs. The car has 140,000 miles on it and I service it religiously. If anyone has any ideas can you please help me out.
__________________
1992 honda civic hatch(sold)
2000 honda accord v6(sold)
2009 pontiac g8 gt
hayabusa160 is offline   Reply With Quote
Old 01-25-2011, 02:27 PM   #14
DeLucia
Honda-Tech Member
Garage is empty, add now
 
DeLucia's Avatar
 
Join Date: Feb 2010
Posts: 394
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

My brothers civic does it, my built and turbo gsr does it, my old integra did it, buddies LS integra did it, friends k series did it. Its perfectly normal
__________________
99 GT35r EM1
717whp 31psi Tuned by Synapse Motorsport
Synapseturbo.com | RLZengineering.com
DeLucia is offline   Reply With Quote
Old 01-26-2011, 12:52 PM   #15
djh781997
Trial User
Garage is empty, add now
 
djh781997's Avatar
 
Join Date: Jan 2011
Location: Cali
Posts: 6
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Turns out after further review of the EGR valve, it was stuck open. No I did not have a check engine light or any other symptoms of a bad EGR valve. Replaced the EGR valve and NOW it sounds "normal" when I take the oil cap off while the engine is running.
djh781997 is offline   Reply With Quote
Old 01-26-2011, 03:11 PM   #16
LPED
Honda-Tech Member
Garage is empty, add now
 
LPED's Avatar
 
Join Date: Nov 2007
Posts: 135
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Quote:
Originally Posted by djh781997 View Post
Turns out after further review of the EGR valve, it was stuck open. No I did not have a check engine light or any other symptoms of a bad EGR valve. Replaced the EGR valve and NOW it sounds "normal" when I take the oil cap off while the engine is running.
Hope you checked all the EGR passage ways cause a open EGR valve should make vehicle idle real bad, rough . A lot of times the passages get caked up .
LPED is offline   Reply With Quote
Old 01-27-2011, 02:21 PM   #17
DeLucia
Honda-Tech Member
Garage is empty, add now
 
DeLucia's Avatar
 
Join Date: Feb 2010
Posts: 394
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

The egr has nothing to do with pressure in the valvecover
__________________
99 GT35r EM1
717whp 31psi Tuned by Synapse Motorsport
Synapseturbo.com | RLZengineering.com
DeLucia is offline   Reply With Quote
Old 01-27-2011, 03:01 PM   #18
someone else
It Wasn't Me!
Garage is empty, add now
 
someone else's Avatar
 
Join Date: Aug 2004
Location: On the Wagon...In the gym. WA
Posts: 2,234
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

Quote:
Originally Posted by djh781997 View Post
Turns out after further review of the EGR valve, it was stuck open. No I did not have a check engine light or any other symptoms of a bad EGR valve. Replaced the EGR valve and NOW it sounds "normal" when I take the oil cap off while the engine is running.
I really doubt this. I've had several Hondas with EGR valves stuck open come through the shop and they all barely ran and wouldn't hold an idle.

Pressure from an open oil cap is normal. Leave your oil cap off and go for a drive then share your results.

Don't actually do that. It makes a huge mess.
__________________
Scars are a reminder of how not to do it next time.
someone else is offline   Reply With Quote
Old 01-27-2011, 03:51 PM   #19
__oversea
Honda-Tech Member
Garage is empty, add now
 
__oversea's Avatar
 
Join Date: Apr 2006
Posts: 4,265
iTrader Rating: (0)
Default Re: Pressure when removing oil cap

I have seen lots of older camry's with stuck EGR open. It barely idle and dies.

Anyways, It's perfectly normal pressure coming out of oil cap. lol
__oversea is offline   Reply With Quote
 
 
 
submit to reddit
Reply

Tags
1990, accord, acura, cap, egr, exausht, explain, hoda, integra, oil, pressure, remove, removing, smoke, system, valve

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump



All times are GMT -8. The time now is 11:04 PM.



2008 Copyright, InternetBrands Inc.
Powered by vBulletin® Version 3.7.4
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.

Honda and the Honda marquee are registered trademarks of the American Honda Motor Company, Inc. Neither American Honda Motor Company nor its subsidiaries or affiliates shall bear any responsibility for Honda-Tech.com content, comments, or advertising. Honda-Tech.com is not affiliated with American Honda Motor Company in any way. American Honda Motor Company does not sponsor, support, or endorse Honda-Tech.com in any way. Copyright/trademark/sales mark infringements are not intended or implied.
Emails & Contact Details