h23 manifold
Thread Starter
Honda-Tech Member
Joined: Jun 2005
Posts: 1,238
Likes: 1
h23 manifold
http://i23.photobucket.com/alb...1.jpg
1.okay why is there 8 ports/runners on the manifold? and why does only 4 of them have butterfly valve.. when does it open wot and when does it closes and how does it know when to do both..
2.if theres 8 ports how does that work when on the block theres only 4 ports...
3.also that black thing on the right is that a egr soleiond or switch. maybe theres a vaccum hose that goes to that so exhaust gase return into the runners maybe?
4. exactly where does the egr collects the gas from and if that fails does the engine gets 2 much and basicially choke it 2 dead?
i appreciate it..
1.okay why is there 8 ports/runners on the manifold? and why does only 4 of them have butterfly valve.. when does it open wot and when does it closes and how does it know when to do both..
2.if theres 8 ports how does that work when on the block theres only 4 ports...
3.also that black thing on the right is that a egr soleiond or switch. maybe theres a vaccum hose that goes to that so exhaust gase return into the runners maybe?
4. exactly where does the egr collects the gas from and if that fails does the engine gets 2 much and basicially choke it 2 dead?
i appreciate it..
Honda-Tech Member
Joined: Jan 2004
Posts: 10,629
Likes: 1
From: Further down the spiral, TX, usa
Re: h23 manifold (soon2bdropped)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by soon2bdropped »</TD></TR><TR><TD CLASS="quote">
1.okay why is there 8 ports/runners on the manifold? and why does only 4 of them have butterfly valve.. when does it open wot and when does it closes and how does it know when to do both..
2.if theres 8 ports how does that work when on the block theres only 4 ports...
3.also that black thing on the right is that a egr soleiond or switch. maybe theres a vaccum hose that goes to that so exhaust gase return into the runners maybe?
4. exactly where does the egr collects the gas from and if that fails does the engine gets 2 much and basicially choke it 2 dead?
i appreciate it..</TD></TR></TABLE>
1. It's a dual stage intake manifold. Search for IABs (intake air bypass)
2. See number 1.
3. Yes, that's the EGR valve.
4. WTF?
1.okay why is there 8 ports/runners on the manifold? and why does only 4 of them have butterfly valve.. when does it open wot and when does it closes and how does it know when to do both..
2.if theres 8 ports how does that work when on the block theres only 4 ports...
3.also that black thing on the right is that a egr soleiond or switch. maybe theres a vaccum hose that goes to that so exhaust gase return into the runners maybe?
4. exactly where does the egr collects the gas from and if that fails does the engine gets 2 much and basicially choke it 2 dead?
i appreciate it..</TD></TR></TABLE>
1. It's a dual stage intake manifold. Search for IABs (intake air bypass)
2. See number 1.
3. Yes, that's the EGR valve.
4. WTF?
H-T Order of Merit
Joined: Aug 2002
Posts: 9,172
Likes: 7
From: somewhere in MI
Re: h23 manifold (soon2bdropped)
just to add...
The H23 is a dual runner manifold. The 8 runners you see there merge further down the runners into 4 runners, from there it goes to the four intake ports in the head. 4 of the ports have those "butterfly valves" because they are closed at low RPM's to force the air to take the longer route giving you more torque at those lower RPM's. At higher RPM's those valves open to allow more air in and shorter distance giving you more power in the higher RPM's. The ECU and a vacuum tank/sensor located under the IM controls the opening and closing of the IAB's.
yes, that black thing is the top of the EGR valve. Exhaust gas passes back through the head via a passage, it then goes into the IM and to the EGR valve, the EGR valve then allows the exhaust gases to enter into the runners at certain times. The exhaust gases are not sent to the EGR valve through vacuum hoses.
The H23 is a dual runner manifold. The 8 runners you see there merge further down the runners into 4 runners, from there it goes to the four intake ports in the head. 4 of the ports have those "butterfly valves" because they are closed at low RPM's to force the air to take the longer route giving you more torque at those lower RPM's. At higher RPM's those valves open to allow more air in and shorter distance giving you more power in the higher RPM's. The ECU and a vacuum tank/sensor located under the IM controls the opening and closing of the IAB's.
yes, that black thing is the top of the EGR valve. Exhaust gas passes back through the head via a passage, it then goes into the IM and to the EGR valve, the EGR valve then allows the exhaust gases to enter into the runners at certain times. The exhaust gases are not sent to the EGR valve through vacuum hoses.
Thread Starter
Honda-Tech Member
Joined: Jun 2005
Posts: 1,238
Likes: 1
Re: h23 manifold (TouringAccord)
then how does the IM send gas into the egr.. thru a steel line or sumthing..
what happens if the egr valve fails all the exhaust gases gets stuck in the car and choke it?
what happens if the egr valve fails all the exhaust gases gets stuck in the car and choke it?
H-T Order of Merit
Joined: Aug 2002
Posts: 9,172
Likes: 7
From: somewhere in MI
Re: h23 manifold (soon2bdropped)
there is a cast tube in the intake manifold that runs from the flange/head to the EGR valve.
A car can be run without an EGR valve. You see people with block off plates where the EGR valve is supposed to be right? But for the car to run properly without an EGR valve the ECU has to be reprogrammed to not look for it. Thats why the car will run bad when the EGR valve fails, the ECU is throwing a code and goes into a sorta safety mode, at least thats my understanding of it. If the EGR valve fails the exhaust gases aren't going to "choke" the car.
A car can be run without an EGR valve. You see people with block off plates where the EGR valve is supposed to be right? But for the car to run properly without an EGR valve the ECU has to be reprogrammed to not look for it. Thats why the car will run bad when the EGR valve fails, the ECU is throwing a code and goes into a sorta safety mode, at least thats my understanding of it. If the EGR valve fails the exhaust gases aren't going to "choke" the car.
Trending Topics
Honda-Tech Member
Joined: Jan 2004
Posts: 10,629
Likes: 1
From: Further down the spiral, TX, usa
Re: h23 manifold (soon2bdropped)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by soon2bdropped »</TD></TR><TR><TD CLASS="quote">well if egr valve fails what happens and what does it do and why does it make the car run like ****..</TD></TR></TABLE>
It doesn't. Lots of people block off the EGR completely with no problems.
You have other problems.
It doesn't. Lots of people block off the EGR completely with no problems.
You have other problems.
Honda-Tech Member
Joined: Jan 2004
Posts: 10,629
Likes: 1
From: Further down the spiral, TX, usa
Re: h23 manifold (soon2bdropped)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by soon2bdropped »</TD></TR><TR><TD CLASS="quote">man i seen an egr go bad.. car ran like **** heard a bunch of knocking noise..</TD></TR></TABLE>
How did you see the EGR go bad?
How did you see the EGR go bad?
H-T Order of Merit
Joined: Aug 2002
Posts: 9,172
Likes: 7
From: somewhere in MI
Re: h23 manifold (soon2bdropped)
I haven't experienced an EGR valve go bad on one of my Honda's but on my girls Jimmy a carbon deposit got itself wedged in the plunger keeping it stuck open which threw a code and the engine went into a sort of safe mode. The car felt really sluggish and idled horrible, no knocking or anything like that though. I took the EGR valve off to find it was only stuck open and not faulty or broke, removed the carbon deposit to free the plunger and all was good.
Thread
Thread Starter
Forum
Replies
Last Post
