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P2004 - IMRC Intake Manifold Runner Control problems

All these abbreviations are confusing!! Can someone clarify I'm understanding this right?


This solenoid we're talking about changing (with the filter) is the Frequency Solenoid Valve? Why is it called that? I'm getting the impression it is there to control the Intake Manifold Runner Control? Why is it not an IMRC valve?

Anyway; the IMRC deals with this funny dual intake thing? So if it's got a faulty FSV it's open all the time, basically giving full air into both ports (as if it was at full power) so you're not getting the swirl needed for low power torque? And the engine thinks it's running on a high swirl high torque setting when it's actually running lean?
 
steve500 said:
Well i seem to have started have a little hesitation at around 1500 rpm. I am about to bite the bullet and get myself a FSV, but before i do has anybody else changed theirs and had a positive outcome. Thanks.
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Hi Steve

I had the hesitation you describe and yes, the Frequency solenoid was the cause, and is said to be the usual culprit. If you want to be sure, like me, have the valve manually checked by Honda to confirm it is faulty. Mine was checked at at Honda Holdcroft and I replaced it myself because it is easy as changing a lightbulb.

Estevao
 
Chris Hanna said:
Jesus! Having read this thread I now know why I am and have always been a petrol person!
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I think bog standard diesel engines of 10-20 years ago were considered more longer lasting and reliable than petrol at the time, but the performance was poor.

These modern high-performance diesel engines are full of cutting edge technology with turbos revolving at up to 150000 rpm and diesel pump pressures of 35000psi and more sensors than the Royal Mint!!!

For a fleet manager I guess the fuel cost savings on high mileages make the decision a no-brainer.

But personally as a second hand buyer looking for reliability I agree with you entirely.

However the world has "moved on" and gone diesel over the last 5 years while we have "stood still" ;)

....ever seen the film 28 Days Later ? :lol: :lol: :lol:
 
Yep they really are far more complicated than they ever were, and not as reliable as normally aspirated petrol cars. But they're not 'unreliable' either. They just need a bit of extra loving really.
 
It wouldn't be TA if us petrol dinosaurs weren't making these smug posts occasionally.

Or if you diesel owners weren't doing the same to us on fuel consumption and and VED threads...... :p
 
Wouldn't have it any other way Cliff ;)
 
F6HAD said:
Yep they really are far more complicated than they ever were, and not as reliable as normally aspirated petrol cars. But they're not 'unreliable' either. They just need a bit of extra loving really.
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Personally at times I was moving away from the 'extra loving' towards the 'killing to death with fire' solution for mine!
biggrin.gif


The problem is that if you do a lot of motorway miles it's very rare a petrol engine (with any decent performance) will add up financially, even factoring in the increased number of electronic widgets that, although they are the size of your finger, still cost almost as much as a base spec Laptop computer!
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joooe said:
Had exactly the same problem for a few months.
I did managed to clean the flap and the intake, but the error didn't go away. Checked all the hoses of the [font="Arial][size="2"]frequency solenoid valve (part nr 9 in the picture below), disconnected them all, cleaned all the electrical connections. Nothing. The error was still there.[/size][/font][font="Arial][size="3"] [/size][/font][font="Arial][size="3"] [/size][/font][font="Arial][size="2"]The car was running just fined, so I didn't bother for a while. When I cleaned the error the light always came on when the car was at normal operating temperature.[/size][/font]
[font="Arial][size="2"]I finally ended up buying a new [/size][/font][font="Arial][size="2"]frequency solenoid valve, but that didn't worked either. Either way I left the new valve in the car [/size][/font]
[font="Arial] [/font]
[font="Arial][size="2"]Then, one day the light went off by itself.[/size][/font]
[font="Arial] [/font][font="Arial][size="2"]Coincidence or not I had changed the fuel brand two days earlier. [/size][/font]
[font="Arial][size="2"]Still didn't know what happened. There's now more than 5 months and the light never came back. [/size][/font]
ph34r.gif

[font="Arial] [/font]
[font="Arial][size="2"]If possible clean the intake and see if the flap moves freely. Check the solenoid valve, clean it and check the vacuum hoses. I remember I even cleaned the EGR.[/size][/font]
[font="Arial] [/font]
[font="Arial][size="1"]Good luck.[/size][/font]
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Sorry to dig this up again. When coming to work this morning, the P2004 code showed up again. Cleaned it with the Scangauge when I stopped the car. Started it again, revved it a bit, waited and stayed off. Let's see what's next. I'll have to see if the part has a 2 year guarantee, because if it has, it's still on time.
Oh well.

 
Nuno - EGR OFF has sorted this on a few member cars now ;)
 
Thanks Fahad. Might be something to consider, but I don't have the equipment to upload the new rom to the ECU and here in Portugal we have the exhaust test in the car inspection. Can the EGR off compromise the exhaust emissions test?

On the other hand, the error is showing up more often.

Today, I cleaned the filter of the old (the first) IMRC valve and replaced the newer one with the old IMRC altogether. Off course it's even worse, the error shows up many times in a trip. Just tried to see if it was all about the filter.

Might try to put the cleaned filter in the newer IMRC and see what happens. But I doubt it will do any good.

Still, I have the invoice for the part and I hope it has a 2 year warranty. It ends at 19th Feb.
 
It doesn't affect emissions whilst not under load Nuno, so unless they have a way of testing your emissions under load, they won't change.

You could upload a new map yourself on this car with a basic cheap tool like the Galletto 1260 - less than £20 on ebay.
 
F6HAD said:
It doesn't affect emissions whilst not under load Nuno, so unless they have a way of testing your emissions under load, they won't change.

You could upload a new map yourself on this car with a basic cheap tool like the Galletto 1260 - less than £20 on ebay.
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From what I've seen, they rev the car up quite a bit (and for a few seconds) to do the test, probably 3000 rpm or around there, while the probe is in the tail pipe.
 
joooe said:
From what I've seen, they rev the car up quite a bit (and for a few seconds) to do the test, probably 3000 rpm or around there, while the probe is in the tail pipe.
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That's not under load though, the engine is just spinning it doesn't have the torque of moving 2 tons of metal attached to it's flywheel!
 
Really? Didn't know that.
If not, I can always put the original file in the day of the car inspection.
 
Dont worry guys.
Mine gets MOT'd at a Honda garage every year. Passed everytime ;)

Also they dont rev the engine to 3000.... Unfortunately they litterally red line it and hold it on the limiter for 3-5 seconds.

its not a nice thing i would ask any engine to do and TBH i think its cruel on the engine.
I ALWAYS ensure that the moment i get out the car the car goes in for its MOT so i know the engine is nice and warm..

too many times i have seen cars left for hours only to be ragged to death to get them warm for the mot :(
 
Just discovered that in Portugal they don't measure CO2, they measure something like fumes density.
 
^^ Yup and that's similar to the smoke test here, it won't fail mate.
 
Thanks! I'll be leaving the car to Honda for diagnose, if the IMRC it's still under warranty.
Otherwise, Fahad your egr-off service can become a solution.
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Jesus, cleaned the air intake ports yesterday and... why do we even bother to have an air filter!!!
I had cleaned it before and the first time it was worst, but either ways this is crazy! Gunk all over the place!.

Noticed something strange though. I also removed the pipe that comes from the EGR and that connects to the intake port. The odd thing is that the side of the pipe that connects to the intake port is full of gunk, but the side that comes from closer from the EGR is dirty alright, but it's just a sooth thing, not gunk. Why does it transforms itself into gunk when arrives at the air intake port? Air? Turbo's oil spray?
Also cleaned the MAP sensor and pipe. And even dismantled the port valve position sensor and gave it a spray with contact cleaner.

Took a spin afterwards, and p2004 didn't showed up. As always, it shows up when the car is at normal operating temperature (around 74/76ºc, as scangauge tells me). But I'm yet to test it from cold, like overnight. Might test it today.

Either way, the car runs perfectly, but the error keeps showing (I even made a video of the valve working - closed when idling, open when accelerating, and you can clearly see it move freely).

Car is booked for Honda tomorrow, let's see.
 
Just in from a ride of about 40/50 miles. Tried everything, the cruising around mode at low speeds, let it iddle for a good while, to rise temperature, turn the engine off, turn it on again, give it a good run at 125 mph for 5 minutes.
No light.

I bet will stay off until the 19th February, right when the solenoid warranty ends.
These things drive me crazy.
huh.gif
 
Yesterday money on my way to work it lighted up and I didn't clear the error.
In the afternoon, returning home, star the car and after a few seconds the light goes out.
Today morning is on again.
Arrrrhhhhhhgggggggg
 
And another video with the P2004 error ON and then OFF.
[font="arial][size="2"]In the first part of the video, the P2004 error is detected by Scangauge II.
When the lights go out in the garage, I clear the error and then the IMRC starts to work properly (moving)[/size][/font]


 
Nuno don't waste money on a new part yet ;)
 
Well, they will want to test if it's a problem related to the EVR valve (yes, EVR), the one that controls the vacuum to the IMRC.
Will leave the car tomorrow with them again, to see if they can get that part out of other Accord i-ctdi and test it in my car.

huh.gif
 
Very stubborn I am, Yoda style.

Here's my testing just an hour ago.
So they say it can be a faulty EVR (green in the picture) and not the IMRC solenoid (seen yellow).
Now, with the error showing up in the dashboard, at idle, the valve is open (should be closed) , I disconnected the red tube and checked for vacuum and I could feel my skin being sucked. Connected the tube to it's place and removed the blue tube and checked for vacuum and there is none.
Cleared the error, checked for vacuum and could feel it in both tubes.
To me it seems clear that the IMRC solenoid is not letting the vacuum pass through. This guys at Honda should know better, right?
e3200.jpg
 
When my IMRC was tested and they found it faulty, the mechanic took the bottom hose from it that connects to the butterfly diaphram, pulled the hose off and stuck a screw in it unti I got a new imrc.

It worked fine, but through up a fault on the dash.

It would be the blue circle in that photo.
 
Hi, i'm new here and looking with interest at this post as I have exactly the same problem. Intermittent light on dash and terrible hesitation under 1500RPM and problems with holding higher gears due to loss of power and then it surges in around 2000rpm. Had the code read and came up with P2004 IMRC valve incorrect position. Having a new soleniod valve fitted tomorrow so will advise on outcome. Interestingly had codes read a week ago at Honda dealer in Wigan and no advises given but charged nearlt £40!!. Went to Honda specialist in Golborne ( Am i allowed to plug a garage here??) and only charged me £20 and gave me a print out of the codes and then spent half an hour going over various 'common' problems to look out for and avoid with this engine.. i call that good service. If I can plug this garage here let me know as it could save other Norhwest members a fortune..... Will update tomorrow.
 
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