What Is This Part For?

[zakmuh]

Hi,

I have this solenoid valve on my 2003 Sorento D4CB engine and it looks like it should have a hose connected to it, but it's missing. In Kia diagram (21) it shows as 'Differential Chamber Assy'. It looks similar to the EGR valve.

What is the purpose of this part?



Cheers

[zakmuh]

I'm going to remove this unit this weekend and share some pics.

One thing though, when I pull that lever, it cut off the engine. Does that tell anything?

[227bhp]

Why are you going to take it off?

[zakmuh]

As you can see, the EGR valve (far end) and the manifold are clogged up. I need to clean all these, including the intercool and the hoses.

This manifold unit is different to most of the units fitted on UK models. So I'm struggling to find a diagram/pic from someone....

[227bhp]

zakmuh said:

As you can see, the EGR valve (far end) and the manifold are clogged up.

No I can't see they are clogged up and you never said which is why i'm asking. Don't worry about it though, it's a recurring theme on here, we like guessing games.
If I was to make a not very educated guess i'd say there will be a type of throttle flap inside the plenum which it is actuating. I think what happens is that at certain times it closes off the fresh air so the engine induces exhaust gasses as well or instead of.

I think your engine is fitted with swirl flaps and there will be an actuator for those too, but I don't think that is it. There is a feature representation on the net somewhere by the makers, it goes through some of the technical aspects of the engine, it may be on there.

[zakmuh]

Ta

Why exhaust gas is fed into the engine through the EGR valve, may I know please?

[SHutchinson]

To lower emissions

[227bhp]

EGR = Exhaust gas recirculation.

[zakmuh]

EGR feeds exhaust air which dont burn inside the combustion chamber, but it cools down the mixture to avoid nitric oxide forming.

So from what you're saying and what it is in my engine, the fresh air is fed all the time but EGR valve kicks in at certain pressure, like when speeding..

[SHutchinson]

Like when cold.

[iridebikes]

Could well be a flap to stop the engine running on if a fault in the turbo occurs (dieseling)

[zakmuh]

iridebikes said:

Could well be a flap to stop the engine running on if a fault in the turbo occurs (dieseling)

Yeah that makes sense, but I couldn't find any disconnected/missing hose in any other places in the engine room

[SHutchinson]

zakmuh said:

iridebikes said:

Could well be a flap to stop the engine running on if a fault in the turbo occurs (dieseling)

Yeah that makes sense, but I couldn't find any disconnected/missing hose in any other places in the engine room

It isn't.

[227bhp]

zakmuh said:

EGR feeds exhaust air which dont burn inside the combustion chamber, but it cools down the mixture to avoid nitric oxide forming.

So from what you're saying and what it is in my engine, the fresh air is fed all the time but EGR valve kicks in at certain pressure, like when speeding..

Yes it's an anti speeding device. If you go outside of the speed limit your engine gets clogged up and slows you down.
Always drive within the speed limit.

[tapkaJohnD]

Does the car have cruise control?
If so, I think this is the throttle for that. There's a diaphragm inside the container hat should be conneted to the intake manifold to sense the vacuum.

J

[227bhp]

tapkaJohnD said:

Does the car have cruise control?
If so, I think this is the throttle for that. There's a diaphragm inside the container hat should be conneted to the intake manifold to sense the vacuum.

J

How would that work?

[zakmuh]

SHutchinson said:

It isn't.

I just had a look and there is a flap inside and when I push that rod towards the engine, obviously that flap closes and then engine cuts off, which means...if that valve had a hose connected and vacuum activate, it will shut the engine down.

[zakmuh]

tapkaJohnD said:

Does the car have cruise control?
If so, I think this is the throttle for that. There's a diaphragm inside the container hat should be conneted to the intake manifold to sense the vacuum.

J

Yes, the car has cruise control option but it's not working at the moment due to faulty speedometer speed sensor.

I can't quite understand how this would relate to cruise control though

[Steve_D]

zakmuh said:

tapkaJohnD said:

Does the car have cruise control?
If so, I think this is the throttle for that. There's a diaphragm inside the container hat should be conneted to the intake manifold to sense the vacuum.

J

Yes, the car has cruise control option but it's not working at the moment due to faulty speedometer speed sensor.

I can't quite understand how this would relate to cruise control though

There may be other bits missing along with the pipe. Missing (or somewhere else in the engine bay) will be a vacuum control valve driven by the cruise control. It will adjust the vacuum going to the unit in your photo which controls the throttle setting.

Steve

[zakmuh]

Thanks

As it's drive-by-wire (DBW) system, CC is controlled electronically. It's a known problem for this model and it needs is replacing the speed sensor at the back of the transfer case

http://www.underhoodservice.com/tech-tip-kia-inter...