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Discussion Starter · #1 · (Edited)
Hi everybody,

I’ve recently bought a Honda Civic 2006 2.2 cdti sport. After a while it gave me an “Check System” error with the little engine icon with exclamation mark. I hope someone could help me out with this problem.

I did take an OBD2 readout on it, and it gave me the following fault code:
P2006: Intake Manifold Runner Control Stuck Closed Bank 1

The car has some history. It’s been used for 3 years and in 2009 (150.000 kilometers driven) it had a massive injector malfunction. The car has been standing still till now. The recently replaced the 4 injectors, oil, coolant, EGR valve controller, cylinder head, head and gaskets. It drives fine, but since I never driven a Civic before, I don’t know if the motor runs in optimal condition.

After some internet research myself I’ve found some interesting information. But since I’m not a mechanic myself (But I’m pretty handy) I really could use some personal advice.

What I’ve found out is that number one suspect is the “Swirl valve”. It suppose to let extra air into the cylinder to swirl the air-diesel mixture around for a better explosion (right?). My guess is that if this is stuck the engine still runs smoothly but less economical. My second guess is that since the car has not been driven for the past 4 years, the valve is a bit stuck. Maybe a tiny bit corrosion, or solidified oil…

My question: Is it possible for me to see if the “Swirl valve” or control rod works without taken of the complete manifold? And if it’s stuck, what can I do to un-stuck it. Is it possible to detach a hose to see the actual “Swirl valve” and may I spray it with some WD40? If it’s possible, a picture from the engine with an arrow where to look would really help me.
 

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Discussion Starter · #2 · (Edited)
Okay, I’ve narrowed it down. I’ve inspected the engine and found some problems.
Here’s a picture to make things more clear.

If I Rev the engine the valve control rod (Point 2) keeps the valve closed. If I shutdown the engine, nothing happens. But when I remove tubing 1 (on picture) the control rod moves and opens up the valve completely. This moves freely, so no stuck valves here. Somehow the vacuum in the tubing isn’t released. I suspect of a malfunction in item number 3. I’ve looked it up and it’s called a “Throttle Body EGR CONTROL” or “VACUUM VALVE EMISSION” I think this thing releases vacuum.
But when I look at the separate part on internet images, it has some kind of cylinder on it:

In my car it has an extra tubing (point 4 in picture). I think this cylinder is some kind of air filter. But where does the tubing go to in my car? Some unified air filter or something?
Do you guy’s also think the problem is part 3?
 

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It could very well be the solenoid (item number 3). My 2008 civic had this item replaced under warranty. My engine light would also come on, don't know what the code was, but the diagnostics indicated it was the cause.
 

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Discussion Starter · #4 · (Edited)
Hi Justdev. Thanks for the reply.
Has this item the same name as: "EGR valve controller"? (this supposed to be replaced).
Or is the EGR Valve the same as the Swirl Valve?

 

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IMRC issues are usually the solenoid. It isn't worth cleaning/freeing the IMRC as you have already proved it isn't stuck by disconnecting the vac line. The solenoid relieves the vacuum by admitting air, hence the cylindrical filter.

The swirl valve does not allow extra air into the cylinders, but allows the ECU to 'disrupt' the airflow from the inlet manifold to the cylinders in such a way as to make it either smooth (laminar) or swirly (tubulent)... this helps combustion across differing rev ranges and engine loading.

The EGR valve controls how much exhaust gas is recirculated into the inlet manifold and has very little to do with the IMRC, other than the recycled gases flow though the IMRC and deposit soot, oil and other crud.
 

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Discussion Starter · #6 · (Edited)
So these are separate things. Just to be clear, point 2 on my picture is the swirl valve control rod and not the egr valve control rod right? And the "solenoid" has nothing to do with the "EGR valve controller" right?
 

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So these are separate things. Just to be clear, point 2 on my picture is the swirl valve control rod and not the egr valve control rod right? And the "solenoid" has nothing to do with the "EGR valve controller" right?
Correct on all accounts.
 

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It might be worth checking the filter isn't blocked... I've heard of this causing a problem, but I have no personal experience of this problem.

For interest, there is a similar EVR controller for the turbo boost control (I believe it might be interchangeable with the IMRC swirl control unit on Civics, so might be a useful swop?). Sorry for not being sure, but I have a slightly different (& older) version of the i-CTDi in my Accord... EGR is directly electrically-operated on my car (and some of the pipework appears to be different).
 

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Inlet Manifold Runner Control (Swirl valve).

There is two air paths into the engine.
One to each inlet valve.
The IMRC has a throttle plate that closes one air path.
This forces the air past the EGR air path and then past one valve only.
This assymetric airflow forces the air in the combustion chamber to spin or swirl

This IMRC valve can adopt any angle...allowing more or less air through the 2nd air channel like a throttle plate.
It only works upto around 3k rpm and upto mid fuel loads.
Beyond this it is fully open to allow maximum airflow.
 

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Discussion Starter · #11 · (Edited)
Hi everybody, thanks for the explaining and the addendum to my picture. A mechanic has replaced the solenoid (although I have warranty on the car, I'd like to understand the inner workings of the engine and maybe I can do some investigation on my own to help the mechanic a bit), but according to him the problem still existed. replaced it again with the original solenoid, and switched the rubber tubes on it. According to the mechanic, the problem was resolved, but when I drove it home the "check system" error came back after a 4 km drive. I have taken a look at the swirl valve, but it stays indeed close no matter what rpm. Same P2006 error code.

So there has been some messing around with the tubing, I haven't changed the original tubing, but maybe it was wrongly wired when they assembled the engine after the injector replacement. I truly can't figure out how the tubing is worked out. Makes no sense to me how everything is connected. Is there some kind of diagram picture online?
 

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Discussion Starter · #13 · (Edited)
Okay, I probably have found the error. I have found a schematic picture of the vacuum lines. And I believe the mechanic made a mistake. On my 2006 Honda, there are no air filters on the solenoids. And the mechanic connected the air inlet of the turbocharger boost control with the air inlet of the IMRC solenoid valve (See the red line on the drawing).



This is a single line without a T connection. If I detach this hose, the IMRC Valve seems to work okay. Of course I don’t know how exactly it supposed to react, but it does move when I push the throttle. Although it never seems to fully close, even when the engine just idles. The p2006 code does not come back if I reset it, but don’t know for sure because I haven’t driven with the car yet. Strange I didn’t get any turbo solenoid valve control errors, looks to me this shouldn’t work either this way.

Obviously there needs to be an air filter on this line before I test drive it. But where was this line original connected to in a 2006 Civic? Probably a main air filter somewhere. Anyone?

Thanks.
 

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So every circuit/solenoid should have:
1. Air in > from filter
2. Vacuum in > from pump.
3. Air/Vacuum line > to device

It looks like what should be a plugged T piece has been used by mistake.
4. Plugged T piece if fitted.

Looks like the IMRC circuit has a remote filter.....where the other solenoids have the filter built in or attached.
 

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Discussion Starter · #15 ·
The EGR solenoid has his own black cilinder filter attached. So, no line to a unified filter somewhere.

I've test driven the car with a temporary made air filter, and it looks like its been fixed. No engine errors anymore and it seems like I have more power. There also was a noise I only could describe like a waste gate flushing (I know the car does not have a waste gate). This is also gone, so i guess something is changed in the turbo system also. Also the fuel consumption progress bar act way more quickly then before. If I push the throttle it imidiately shoots up the fuel consumption, before the adjustment there was more lag between pushing the throttle and see the progressbar moving. So the fuel consumption has gone up when I accelerate, but when I keep a steady speed, the fuel consumption progressbar indicator gives me one stripe less :)
 

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What have you connected your temporary air filter to? Each EVR/solenoid should have its own air admittance filter.

But glad to see you are getting some success!
 

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Discussion Starter · #17 ·
Hi, sorry didn't realize there where some questions. I've eventually solved it by giving each solenoid its own "air" filter. I've used small moped petrol filters, and works great.
 

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Thanks for updating. So these solenoid valves are basically pneumatic 3/2 valves.
 

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Thanks for all this guys. My motor is throwing up the same code too. Doesn't seem to make much difference to performance but I think the MPG is suffering.
So have we decided what the problem is? Perishing hoses? Blocked fillers? Not enough fillers?
Could a clogged egr throw up this fault and code?

Sent from my Nexus 7 using Tapatalk
 
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