Blanking Off Egr Valve ?

[local hero]

Just a bit confused by this, A few forums reccomend it, and even Anchs has hinted at it..But in my ignorance would not a blanked off EGR be the same as a blocked (gunged up) one? obviously i am wrong so what are the percieved advantages of doing it ? has anyone tried it ? and would doing it throw up a fault code? not something i am considering, Just curious....Stew

[jedi134]

Maybe this is the answer to the 2AD problems?

In Landrover world we have no exhaust gas entering the intake, it goes straight out the back, knocking down trees on its travels :D

[CharlieFarlie]

Stew. Many People blank off EGRs on Fords in fact its a very common thing to do and the 2,2 diesel in the Transits are notorious for needing frequent changes.. There are kits with blanking plates readily available.

But the Rav 4 one is so easy to take apart and clean there would be little or no gain.. Blanking off may mask any blockage problems that indicate other issue with the engines ??

Not sure Mate but I would rather do an occasional clean and inspection which keeps an eye out for other issues at the same time..

[anchorman]

It is dead easy to do.

I know a lad who made stainless steel blanks for each end of the pipe and it runs very nicely (technically, it should run better without the diluted charge) and it has been through 2 MOTs.

[Cyker]

@localhero: You're kinda right - It would have a similar effect to the EGR being blocked up with soot, but the blocking up is not the problem with the EGR - The problem is it getting jammed open and feeding exhaust gasses into the engine ALL the time instead of only when the engine is under light load.

The only reason to clean it out is to reduce the risk of it getting jammed open, but blanking it off would make this problem moot so it is an option; The only risk is to do with failing some emissions tests in the MOT or whatever but AFAIK they measure emissions at high load, not idle, so I don't think it would ever be an issue.

If you did blank it off, NOX emissions will go up but everything else (particulates, CO, etc.) goes down plus the engine will warm up slightly faster and have more power at the lower ends of the torque/power curve.

I personally wouldn't bother unless mine kept getting jammed open as under normal operation you can't really tell since it closes anyway when you demand more load from it.

[BMH]

blanked egr using 3mm alu /threw up eml after 15 miles approx /rav now seems smoother and no hesitatation rite up to max rmp/mpg still not conclusive early days.

[gjnorthall]

MPG will be down if the EML is illuminated. The issue is that the valve must be cleaned and freed before blanking off - otherwise it will register a fault code.

[battleaxe]

said this in the past no engineer would say there is a beniefit to an engine to put filth back through it, crap going through your turbo viens into the v/vs then the cyl. no wonder these motors carbon up, !Removed! Brussels cause this country so much aggravation, anyway mine been blanked for 6000 mile now no light on dash, it anything it picks up better when cold,

B-A

[BMH]

MPG will be down if the EML is illuminated. The issue is that the valve must be cleaned and freed before blanking off - otherwise it will register a fault code.

hny to all replies /forgot to mention /gave egr valve a good clean and was working freely /checked all pipes etc before fitting blanking plate.eml on because ecu not sensing valve in circut /no flow /will try it for a few weeks trial and see what happens?

[gjnorthall]

From an operational point of view - the car will run fine without recirculation - it's simply an emissions control system. If the valve is working correctly - albeit blanked off - you should be able to extinguish the warning lamp.

[bigend]

said this in the past no engineer would say there is a beniefit to an
engine to put filth back through it, crap going through your turbo viens
into the v/vs then the cyl. no wonder these motors carbon up, !Removed!
Brussels cause this country so much aggravation, anyway mine been
blanked for 6000 mile now no light on dash, it anything it picks up
better when cold,

+ 1 to right marra. Keith

[the fox]

At least someone knows what they are talking about (Long live the blankers)

[gjnorthall]

EGR is used for a good reason - on a diesel it reduces combustion temperature which in turn reduces the emission of NOx. EGR systems can be troublesome but fortunately technology is moving on, and some manufacturers have already introduced far more robust NOx control systems. The UK is failing to meet it's obligations in terms of exhaust emissions and in London, for example, 95% of NO2 emissions arise from vehicle exhausts. One of the issues is the shift in the % of diesel cars over the last few years. Like it or not, we are likely to see further tightening of the MOT test to check that vehicles have fully operable emission control systems as originally installed and such systems haven't been modified or disabled.

[battleaxe]

Well GJ correct me if i'm wrong but the EGR V/V only work when the engine is not up to temperature, so when your diesel goes for an MOT it has to stand till the sniffer (tester) decided your engine oil is up to it's correct temperature to take the reading, so at this point the EGR V/V has no reverence in the test, and I'm nearly sure the test is for CO2 emission only, maybe I'm spouting rubbish but imho what I has stated is true, get our politicians out of there gas guzzling limos and Londons smog may be reduced by 75%

Geordie

[gjnorthall]

The MOT emissions test for diesels only checks for smoke, and the pass level depends on the age of the car. The conditions for the test are defined, and include the engine oil being up to temperature. The EGR system reduces NOx emissions - this is a mix of harmful colourless gasses that are not checked as part of the MOT. Gas guzzling limos are bad news and I suppose a start has been made at tackling the issue by penalising high emission cars by charging much higher road tax. The drive will continue to make cars more fuel efficient thus reducing overall emissions - at the same time, more and more technology will be built into cars to minimise the release of harmful emissions from exhausts. MOT tests will become more stringent in order to ensure that emissions control technology is working and isn't being removed or bypassed by vehicle owners.

[battleaxe]

so remove the blank at test time, try reading Clarkson in the Sun today, to me cars get the blame for everything, an easy cash cow like alcohol, are vehicles not banded today according to the crap they emit? oh and by the way who pays for the road tax on government transport, could it be the cannon fodder who struggle day to day or the likes of people who pay £47.00ish for a hair cut