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DPF and inlet manifold shutter valve

Camsti

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Hello there :)

I have a nice 2009 Honda Accord 2.2 i-dtec 8th gen. with 117.000 miles driven.

4 weeks ago it gave me the "DPF clogged with an explanation sign". I pulled over, and the car was transported to my mechanic. He sent the DPF to a professional cleaner, changed a temperature feeler in the DPF and I was set to go again.

One week later it again showed me the "DPF clogged with an explanation sign" I gave my mechanic another visit and he spent a lot of time with his tester (a proffesional tester that is - not the one you buy on Ebay!) but there was no errors to find.
Only thing he found was a warning for the inlet manifold shutter valve not working as it should.

He took the entire inlet system apart and cleaned everything, both the EGR-valve, the inlet manifold shutter valve and the inlet manifold shutter valve housing.

He drove a long trip using various driving styles and everything worked perfect.
I picked up the car the day after, and after only a few miles the warning came back.

Again, back to the mechanich, he did a lot of stuff, resetting etc. but still no errors. Another long test trip where the car drives like a dream.
When I got back behind the wheel and drove a few miles, the warning once again came back.

When the warning comes, the car goes in emergency programme and looses all its power.

Changing the inlet manifold shutter valve is of course an option but it is extremly expensive and it takes a lot of time to change it.

Does anyone have experience with other solutions? What can actually be wrong with the inlet manifold shutter valve? Honda says it is non-repairable, but perhaps they just want to sell me a new one?
If its possible, can a used inlet manifold shutter valve be found and is it recommended?

Actually my mechanic thinks that the inlet manifold shutter valve is working fine since the computer doesnt report any errors, and it is some kind of wrong-value somewhere in the system that causes the car to show the warning and go in to emergency programme.

According to the tester the DPF is working like it should regenerating every time it needs to.

Kind regars
Jan Overgaard
 

F6HAD

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Are you referring to the intake manifold runner control? That can be tested via a Honda diagnostic system or decent diagnostic machine. As for the dpf, that needs replacing with a genuine Honda item or removed and ecu flashed correctly. No other shortcuts or remedies I’m afraid.
 

F6HAD

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Imrc is the intake flap, regulates the flow of air in the intake creating turbulence and directing air down different paths to achieve low and high end torque depending on what the ecu mapping parameters are requesting.

The shutter valve as explained in that thread is part of the dpf cycle and is designed to force exhaust temps to raise when the ecu requests regeneration of the dpf.
 

Camsti

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Is it possible that the problem relates to the imcr? As far as I can see it is a lot cheaper and easy to replace, so if there is a chance that might fix the problem I would try that ...
 

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The two things are not related really and it’s difficult to advise without seeing the car myself. What are the error codes your mechanics diagnostic is picking up?
 

Camsti

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Thats the main problem. There IS no error codes :(

I realize it is next to impossible to advise about stuff like this without having the car ...
 

DazTheMe

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Having a DPF that keeps clogging wont throw any other codes as long as everything else is working fine. It will start to throw codes such as boost pressure ect if the clogged DPF starts to blowback in to the turbo and cause damage. I think you're thinking just because no error codes are thrown with the DPF warning light, that there's not a problem with the DPF, in reality it's far more likely to be the DPF than anything else.

I can't say I remember many or even any on this forum have problems with IMRC but recall a lot of DPF problems, my self included.

I don't know what your options are in Denmark, but I'd imagine just a professional clean or full replacement. Without sounding like a "know it all" or rude, I think looking for an underlying problem to the DPF light is reaching and will just lead to more damage if the DPF isn't replaced/cleaned/removed or whatever.

This is all my unqualified opinion wish you the best of luck though :).
 

Camsti

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Perhaps you are right.

Actually I am a bit happy that it properly isnt the IMRC .. My mechanich has reached the same conclusion. He thinks it has something to do with the DPF and the regeneration system. Perhaps it regenerates but doesnt finish the regeneration and therefore gives a warning.
 

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I hadn’t realised there are no codes. How is he diagnosing a faulty shutter valve without any clear diagnostic to either isolate the part or an error code relating to it?

Bottom line is it’s your dpf and you need either replace or remove if you want some headache free motoring for the foreseeable future.
 

Camsti

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He first thought it was the shutter valve because the values didnt change en the menu. Now he thinks it is something else because the car just went crazy.

First one of the glowing tubes (dont know the right english word for it - but the thing that preheats the cumbustion chamber) was faulty. No. 4 was totally black - but worked fine when testet for some reason.
Now there is a temperature feeler in the exhaust system (not in the DPF - is has already been replaced) which only reaches 76 degrees - which is very low after a testdrive ..

I love my Honda .. Still .. But the love is fainting :(
 
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