The Mitsubishi Pajero Owners Club®

DieselAddict · Posted: Fri Nov 19, 2004 3:01 Post subject: What is a clean EGR valve ?

I know you can dump the valve in diesel, kerosane, etc etc to soak the EGR valve, but having said that, can anyone kindly tell me what is a clean EGR valve? Is it like somewhere we push it we should be able to feel something moving?

I want to to know exactly if my EGR is in good working condition or not.

Please direct.

Thank you.

Adrian

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2112ian · Posted: Fri Nov 19, 2004 7:37 Post subject: egr

hi adrian, with the engine running, get some one to raise the rpm above idle speed and when the vacuum(from manifold) acts on the valve u will see it move the shaft and open the valve up to allow exhaust gases to re-enter the inlet manifold. if you get no movement the valve is clogged with carbon(common problem) and the EGR will need cleaning in STP injector cleaner(or such like!) mine was half blocked up when i took it off! I have since blocked off the valve (as do many bods on this site!) with a blanking plate(£5) this reduces smoking as the engine is no longer able to burn re-circulated burnt fumes, but haven't experienced a power increase as some people claim, hope this helps, ian g

DieselAddict · Posted: Fri Nov 19, 2004 8:51 Post subject:

Hi Ian

thanks for your info.

currently i have blocked the EGR, yes a little less smoke, but the pulling power has decreased, strangely. I have to foot the gas deeper .... which I dont like.

Mileage wise, I have done a lot of highways recently so it save a bit of diesel, but not as much as many claims .... that it has such a whopping difference ....

I m considering to shift back ... with a working nice EGR .....

Anyone are welcomed to input more views and experience.

2112ian · Posted: Fri Nov 19, 2004 8:59 Post subject:

cheers m8 , let me know how it seems when u switch back, considering this myself-ian Confused

DieselAddict · Posted: Fri Nov 19, 2004 9:27 Post subject:

One more thing ... sorry about my ignorance ...

after i clean it properly and thoroughly ... can I make the valve thing move by myself ?

when you talk about testing it , you mean you detach the valve from the vehicle and then start the engine and only connect the vaccum tube to test it ?

Thanks again.

2112ian · Posted: Fri Nov 19, 2004 9:36 Post subject: egr

hi again ,just run the engine with vacuum tube in place, u should see the shaft move within the EGR as the RPM rises..., to test the EGR with the engine off u would need to remove the Vacuum pipe from the rigid supply pipe and either suck on the pipe(and turn purple!!) or use a vacuum pump this will also act on the valve, and if all is well u will see the valve open(it works like it old advance/retard pumps on distributors on old cars!!) sucked many dirty pipes in my time!(no lads its not wot u think either Very Happy

)

DieselAddict · Posted: Fri Nov 19, 2004 9:43 Post subject:

sure ... Thanks again .....

dirty hands but smily yet purple face tonite ..... Shocked

helijohn · Posted: Fri Nov 19, 2004 10:20 Post subject:

I am one who has opted not to block off the EGR as I believe in the extra cooling properties with it functioning. So this means that I will obviously have to clean it now and then and I am curious as to what to look for specifically when the EGR is off the motor for cleaning and after cleaning. The detail info like what moves and where and how much and what pressure etc. Don't think I can leave it to soak overnight as the vehicle is in use late and early so what else is there to quickly clean it up?

DieselAddict · Posted: Fri Nov 19, 2004 10:26 Post subject:

Hello John

I dont understand what you mean by the "cooling property", can you explain a bit more about it or can you show me a link to it (if you have mentioned about it b4) so I can have a better understanding ?

many thanks.

Adrian

2112ian · Posted: Fri Nov 19, 2004 10:27 Post subject: egr

hi ,heli-john, cleadmy EGR in an hour with injector cleaner(kerosene) deposits were just sooty but i guess if your valve as never been cleaned before it may be more like carbon deposits u will have to deal with; let the valve soak for an hour or two then use elbow grease to clean it up, would recommend new gaskets when re-fitting and make sure valve moves freely when u push with your finger Very Happy

2112ian · Posted: Fri Nov 19, 2004 10:33 Post subject: egr

me again, as i understand it, with the EGR functioning the intercooler actually runs HOTTER because hot exhaust gases are being recirculated nito the combustion chambers negating the cool ,dense air supplied by the intercooler(to a degree anyway!) so with the valve blocked off you should get marginally more power from the beast

JayCee · Posted: Fri Nov 19, 2004 10:40 Post subject:

When you remove the ERG valve from the motor ,
Looking at the side you will see a metal shaft .
It's visiable .through the hole where the blanking plate would go.

At one is a bellows or diaphram with an attachment for the small rubber vacuum pipe....at the other is a concave shape where the
valve should open.
The inner section of this is about 25mm in diameter ..
It will probably be stiff or impossible to move .

Soak, scrape , wire brush , and press on this until it starts to move.
(To get mine moving initially I had to press it against an upturned 17mm socket..)

Keep working at it ..as unbelivably ..this should move by sucking on the small pipe at the other end . The vacuum it works at is about ..
Minus 0.4 Bar ..about the same suction as required to drink a pint through a very narrow straw.

JayCee · Posted: Fri Nov 19, 2004 11:22 Post subject:

2112ian · Posted: Fri Nov 19, 2004 12:35 Post subject: EGR

cheers jaycee we live & learn.... so whats your definative opinion..... to block or not to block?.. that is the question

JayCee · Posted: Fri Nov 19, 2004 12:56 Post subject:

Anything that helps to lower the combustion temp and the cylinder head temp is good news to me ..!

Mine is UN-blocked ..working freely , and hopefully protecting my wallet
from buying ANOTHER cylinder Head .

To each his own..
But ..I wouldn't risk it for anything longer than a quick visit to the MOT station..! Rolling Eyes

Joe