Egr vacuum question

[Pajero]

I Am having some trouble with heavy smoke on my 94 Paj 2.8l I had cvi do a "pajero tune" which has helped some but sometimes when i drive to work its smoking like mad and then when I drive home 9hrs later it drives nice and clean......I noticed someone had blocked the EGR valve but just the vacuum line, so I decided to clean the egr valve and replaced the vacuum line, but I dont think I'm getting any vacuum to the egr checked it as the truck started and also by reving the motor but it does not seem to open...


Any Idea's would be awsome.

Thanks

Joe

[jessef]

Block it.

[pajerry]

Is blocking it really benificial?

I have no smoke or power issues, but if it can only help than why not?

[Green1]

Is blocking it really benificial?

I have no smoke or power issues, but if it can only help than why not?

While the EGR is technically not required on these engines, they were designed to have it there, as such I don't believe that blocking the EGR is ever the best solution. blocking it is simply the "easy" way to eliminate the smoke and other issues caused by an EGR that is malfunctioning, a better way would be to clean it and leave it in place. If yours is working fine, leave it be!

After reading a lot of posts on the UK site, the general consensus seems to be that a blocked EGR works better than a jammed/dirty EGR, however a properly working one is better yet.

[Pajero]

But what would cause the EGR not to open, is there problems with the vacuum solenoids?

[loki]

But what would cause the EGR not to open, is there problems with the vacuum solenoids?

they can get stuck open and possibly closed with a carbon build up.

[Pajero]

Cleaned the egr valve but dont think there is any vacuum to it as i dont see the valve open at all even at start up or reving the motor

[EnviroImports.com]

you wont notice it open or close unless its failed in the open position, when they do, your intake manifold is Sucking in as fast as it can, your exhaust.
the theory is that when you start to drive from a stop, you get a shot of unburnt fuel so for the first "suposed to be" 5* of your throttle the egr gets vacuum and opens up, so you get that thick with fuel load of exhaust back into your intake manifold, burning it properly on the second pass.

when it gets gummed up, sticky, or just fails when it feels like it, they are pumping 1200+degree exhaust into your intake , and that doesent make for good combustion... or good performance , but does make for some great black smoke....

Put a egr blanking plate on and a intake blocking plate and you will get more power, and slightly better milage, but only noticably better if your egr is failing on you....
on another note, its a GREAT time to put in a pyrometer as when i put my egr plates in both my delicas, I put a 1/8npt fitting and a pyrometer in so i dont shut off my van with the exhaust temp to hot and cook the oil in my turbo. ......hope thats not to much info
Noel

[Green1]

and slightly better milage

experience on the UK site actually indicated the reverse, you get worse milleage unless your EGR was failing. Once again, a functioning EGR is better than a blocked one, a blocked one however is better than a broken one.

[DelicaFreaka]

Block it.....you will not regret it..........................Kirk out.

[bionic]

....frankly I cannot believe this is still a topic. Follow the countries that import the Mitsubishi diesels from japan and they are blocked from the factory.(Austrailia for instance) The EGR is simply NOT there and has a delete plate on the intake ....no adverse effects..no worse milage....and one hell of a lot less smoke and problems. Ask yourself why you feel that blowing hot exhaust gases into the intake would help anything (but emmissions control). The EGR is not an exhaust cat....if you really want to help the environment, install a high efficiency cat....not the same- but equal. JMO

[Green1]

And I still can't believe that people refuse to believe that Mitsubishi would have designed an engine assuming that the EGR would be there...
considering that these vehicles come with it from the factory, and they don't all smoke horribly at that point, and considering that the engines are designed to have one, it's incredible that anyone would think that the engine would be BETTER with it removed!

keep it clean, and it will always be better than not having one.

It should alsobe noted that several people on the UK forum reported that they had problems with black smoke STARTING after they removed the EGR... something about the vehicle being tuned for having one, and about not messing with something that isn't broken...

[bionic]

..perhaps a re-read of the above. Mitsubishi does NOT install the EGR system for use in all countries who do not require it. Not all factory specifications are done with performance in mind..even THEY know the performance drawbacks of pollution control devices. In BC we dont require the EGR system to pass pollution control as we are only looking for very basic signs of incomplete combustion (carbon cloud)....you will get better combustion with more oxygen to burn the fuel for this issue.
..please advise that some on this site are experienced /knowledgeable people not just newbies to vehicles -diesel or otherwise. Not just weekend warriors.
P.S. If some guy reports smoke only after blocking his EGR...he srewed up something. There are many components to the fuel delivery system- even on an IDI diesel. Some people can screw up anything.

[Modsqwad]

Experiencing heavy black smoke on start up and warm up with severe lack of power. Removed and cleaned the egr then blocked the
vacuum hose so it would stay shut. No more smoke better power so immediate problem solved. However the manifold bolts did not
play nice and stripped some threads coming out. Cleaned up ok with a tap but definetly not perfect and nowhere to buy a hilecoil down
here. Next trip to Canada I will block it and fix the threads and maybe do the EGT gauge at the same time. I think the moral is to do away with it. Stock factory engineering is nice when it works but I won't spend a fortune to maintain a failure prone system designed
to reduce NOX in some countries other than Canada. A 91 diesel in Canada did not need EGR so I see no reason not to get rid of it.
Andy Wilson
Sayulita Nay.Mx.

[Green1]

..perhaps a re-read of the above....

I have read what you said, it doesn't make you right.
The EGR is mounted on these vehicles, and the vehicles ARE designed to operate with it. Mitsubishi knew these vehicles would have an EGR and adjusted things accordingly. the fact that some vehicles don't have one in no way changes the fact that these ones DO.

Mitsubishi does NOT install the EGR system for use in all countries who do not require it

Can you tell us EXACTLY what other modifications they make when the EGR is not present?

In BC we dont require the EGR system to pass pollution control as we are only looking for very basic signs of incomplete combustion (carbon cloud)

Just because you don't need it doesn't mean you are better off without it. there are an awful lot of things that you don't require that you are still better off to have and that the engine was designed to have.

P.S. If some guy reports smoke only after blocking his EGR...he srewed up something. There are many components to the fuel delivery system- even on an IDI diesel. Some people can screw up anything.

According to everything you've said, this is a simple mod that is very difficult to screw up, which implies that a LOT of people must have "screwed up" a very simple procedure because many people in the UK have had an increase in smoke and a decrease in power after blanking their EGRs when there was nothing wrong to start with.

You can remove it if you want, and you won't likely damage anything by doing so, however you will never do as well in these vehicles by removing it as by having it operating properly, that has been well established on the UK site. These vehicles HAVE been tuned with an EGR in mind.

..please advise that some on this site are experienced /knowledgeable people not just newbies to vehicles -diesel or otherwise. Not just weekend warriors.

I'm not sure what you mean by this, but if it is trying to imply that I don't know what I'm talking about, I assure you I did plenty of research on this subject a couple of years ago.