EGR - Anybody here mechanical minded?

NeverEnough

lee678 wrote: »

its not assumptions, and were not talking decat and stainless, to assume theyre only fitted to reduce NOx is wrong, and to say blanking them off does no harm is wrong, for one your increasing the combustion temparature, two, your increasing the temparature on the exhaust valves vastly shortening there [ and there guides ] overall life, and finally three without getting too involved [ re technical] your putting your foot further down with these increased temparatures, millions of pounds spent in the design lab and someone puts in a cut out bean tin :rotfl:

Nonsense :rotfl:
I'd recommend those interested do a proper search on the subject. Thousands and thousands of car enthusiasts who know the engines inside out are definitely not wrong :rotfl::rotfl: I know who I believe and its certainly not you :rotfl::rotfl:here is some info from the T4 / T5 forum.


"EGR stands for Exhaust Gas Recirculation which does what it says.
It takes exhaust gas & (recirculates) puts it back into the engine via the inlet manifold under certain operating/engine conditions.
This reduces the temperature of combustion therefore cutting down on the amount of Nitrogen Oxide (NOx) that the engine produces.
On many engines the exhaust gas that is recirculated ends up as a sticky, soft tar like residue usually found in the inlet manifold or inlet ports if the cylinder head.
Sometimes the valves stick permanantly open which causes a misfire at idle.
Like a Catalytic converter the EGR valve is an emission control device & like a Cat Converter is fine when working correctly/on new engines.
As soon as the engine has seem some use/age or is used out of its normal running parameters these devices can prove troublesome.
Dont forget the pictures shown of my engine relate to a 1Z that has covered 130K and is 17 yrs old. Although it was checked before I removed it and therre were no (EGR) faults stored in the ECU.
Manufacturers fit these devices because they are forced to by ever decreasing emission regulations, not by choice.
NOx is a gas that is measured when a Manufacturer presents an engine/ vehicle for type approval, but NOT measured as part of the annual MOT in this country.
So will your vehicle fail the emmission test with the EGR valve blanked off? - No "

NeverEnough

lee678 wrote: »

its not assumptions,

It is. Proof of the pudding and all that. :rotfl:

lee678

you see, what i find, in my job, is people buy a £20 code reader, and find the fault egr valve low flow, then, rather finding out the reason , they just blank it off, if they had regular servicing, and used quality fuel, and treated engine management systems with respect, the need to purchase a replacement egr would be a lot further away, you quite clearly state in your post =
Dont forget the pictures shown of my engine relate to a 1Z that has covered 130K and is 17 yrs old. Although it was checked before I removed it and therre were no (EGR) faults stored in the ECU.
proof enough of the lasting capabilities of a egr in a looked after engine, maybe thousands have blanked them off, but theyve only done it in the majority of cases because the managment light has come on ! think back to what the original poster asked yes ? do these thousands of people [ your quote] blank them off befre the management light comes on ? no .

Joe_Horner

lee678 wrote: »

...millions of pounds spent in the design lab and someone puts in a cut out bean tin :rotfl:

Followed by another one bent to look like fan blades to "create a vortex in the mixture". Or get swallowed by the engine. :rotfl:

But the accessory guys always know better than those professional engineers in multi-million-dollar R&D labs who work every day to get a competetive edge over the other makers!


eta: Arcon, the advice from gkerr was good - if you're not sure what it does / how it does it etc then probably best to strike it from your list. You may be ok or you may end up with VERY expensive complications!

NeverEnough

lee678 wrote: »

you see, what i find, in my job, is people buy a £20 code reader, and find the fault egr valve low flow, then, rather finding out the reason , they just blank it off, if they had regular servicing, and used quality fuel, and treated engine management systems with respect, the need to purchase a replacement egr would be a lot further away, you quite clearly state in your post =
Dont forget the pictures shown of my engine relate to a 1Z that has covered 130K and is 17 yrs old. Although it was checked before I removed it and therre were no (EGR) faults stored in the ECU.
proof enough of the lasting capabilities of a egr in a looked after engine, maybe thousands have blanked them off, but theyve only done it in the majority of cases because the managment light has come on ! think back to what the original poster asked yes ? do these thousands of people [ your quote] blank them off befre the management light comes on ? no .

Thats simply not true. None of the many T4 owners I am aware of who did the EGR blanking ever had engine management light problems before they did so. My old T4 has been impeccably serviced and maintained over its long life, too and the management light certainly is not on and has never come on, but I also chose to blank off the EGR valve and am really glad I did.

i disagree entirely with you about EGR valve blanking and would advise people to read up on it if they are unsure. We are all entitled to have our own opinions. My T4 is a brilliant vehicle, over 12 years old and has done nearly 300 000 miles and has benefitted greatly from the EGR valve being blanked, together with having a free flow decat exhaust system fitted. I am sure it will outlast many other vehicles with their high tech EGR valves in situ.

bikingbarney

lee678 wrote: »

its not assumptions, and were not talking decat and stainless, to assume theyre only fitted to reduce NOx is wrong, and to say blanking them off does no harm is wrong, for one your increasing the combustion temparature, two, your increasing the temparature on the exhaust valves vastly shortening there [ and there guides ] overall life, and finally three without getting too involved [ re technical] your putting your foot further down with these increased temparatures, millions of pounds spent in the design lab and someone puts in a cut out bean tin :rotfl:

I fitted a blanking plate to vectra cdti as it was a well known cure for bad throttle pick up and also cured a flat spot around 2000rpm

another reason was to stop the exhaust gases and carbon build up in the inlet manifold as this was proned to breaking to.

Notmyrealname

bikingbarney wrote: »

you need to locate EGR vlave find where the plate is fitted, remove and drill hole in plate around 6 -8 mm then reift plate.

If you are going to do that on the Mondeo you might as well take out the blanking plate as the pipe isn't that much larger.

There are two types of EGR on the Mondeo. One is operated electronically, the other by vacuum. If its the electronic one (has a plug with wires on it instead of a vacuum pipe) then there's not a lot you can do other than live with the warning light if it comes on. If it is the vacuum one, make sure the vacuum pipe is blocked.

Blanking the EGR valves on the MK3 Mondeo TDCi is a good thing. It makes it behave better in accelerating and removes that dead spot around 2300 RPM.

Mankysteve

The question that's got to be asked is that the real reason for the fault code?

Yes it may be EGR valve that been blanked which isn't a big issue, but unless your going to go out there with a proper testing kit you want know if there are any other faults.

Strider590

The car will run better without the EGR valve. It's fitted to help the car meet EU emissions regs for new cars, once you leave the showroom the car never needs to meet these regs ever again and the EGR causes more trouble than it's worth.

Notmyrealname

lee678 wrote: »

egr s should not be blanked, they are there for a very important reason on todays modern engine, look it up

You should. All they are there for is to reduce emissions by recirculating exhaust gases back through the engine. They serve absolutely no other purpose. They don't improve performance or fuel economy.