EGR valves why?

[Smallfry]

Quick question, was the (webasto type) pre heater functional?

I have Webasto pre or parking heaters on all my vehicles. What do you want to know ?

 

[mtt.tr]

Yes. We don't want to know anything from grubby types. Might know more than us, and spoil the agenda.

As I understand it, DPFs merely pulvererise big particles, into even more damaging small ones.

Dpf should consume the particles

 

[reb78]

Dpf should consume the particles

I thought it really just holds them and then dumps them in a slightly different format following some heat out of town where it 'doesnt matter'?

 

[minimutly]

1999 VW transporter.......took the egr off and installed a blanking plate under it......end off.......

Displays an endearing level of care for your fellow man that....

 

[minimutly]

Back in the 1990's I made this exact comparison in a presentation to a joint meeting with Departments of Transport and Environment - as usual Treasury declined to attend a meeting with us grubby industry types.

I offered a simple choice:

Continue the Duty subsidy on Diesel and Save the Polar Bears
Stop the Duty subsidy on Diesel and Save the Voters.

The decision was to gradually reduce the Duty subsidy on Diesel, But Gordon Brown took fright at the voter backlash as so many Voters has taken advantage of the Duty subsidy by buying dirty Diseasels.

As @Ubique points out the 2 most deadly emissions from Diseasels - PM 2.5 (fine particles too small to see) and NOx cannot be tested in the annual MoT test. I long ago stopped trying to educate Dieseasel owners who whine - but mine doesn't emit any smoke.

So how and what for are diesel owners entitled to a claim against the car suppliers (mydieselclaim.com)?

 

[m_c]

Never really understood the fuss over egr valves on diesels, they only work at idle,as soon as you touch the throttle the things shut.

Bob

EGR is active over most of the rev range.
Under high engine load to prevent NOx, and low load to improve fuel economy.

 

[8ob]

EGR is active over most of the rev range.
Under high engine load to prevent NOx, and low load to improve fuel economy.

Nothing that clever to operate an egr on my old bus, it’s got a micro switch on the pump that opens a vac valve which in turn opens the egr, touch the throttle and it’s shut. May be different on newer kit.

Bob

 

[rcx132]

EGR reduces the available oxygen which reduces the burn temperature and prevents the production of NOx.

NOx is one of the exhaust gas components which is proven to be detrimental to human health (IIRC it's one that was suspected to be a major contributor to cot death), which is why it's been a top target for emission reduction.

So glad this made it as the first answer. It's the most correct.

VOSA roadside checks, so if caught, they could remove the vehicle as it is no longer type approval compliant and fine the driver up to £1k. The same goes for DPF & SCR 'defeats'.

This is why I've never done any of the deletes. I care about my car and don't want it crushed by VOSA. Those road side checks are looking for dangerous modifications that aren't part of the MOT test.

 

[Trevorleach]

Back in the 1990's I made this exact comparison in a presentation to a joint meeting with Departments of Transport and Environment - as usual Treasury declined to attend a meeting with us grubby industry types.

I offered a simple choice:

Continue the Duty subsidy on Diesel and Save the Polar Bears
Stop the Duty subsidy on Diesel and Save the Voters.

The decision was to gradually reduce the Duty subsidy on Diesel, But Gordon Brown took fright at the voter backlash as so many Voters has taken advantage of the Duty subsidy by buying dirty Diseasels.

As @Ubique points out the 2 most deadly emissions from Diseasels - PM 2.5 (fine particles too small to see) and NOx cannot be tested in the annual MoT test. I long ago stopped trying to educate Dieseasel owners who whine - but mine doesn't emit any smoke.

I did read some time back, that the particles in Euro6 exhaust emissions are now so fine they are entering the food chain?

As for the no smoke thing, you wont find any 200tdi owner ever making that claim.

 

[mtt.tr]

I did read some time back, that the particles in Euro6 exhaust emissions are now so fine they are entering the food chain?

As for the no smoke thing, you wont find any 200tdi owner ever making that claim.

Or 300tdi in my case, would like to find a someone capable of setting it up correctly.

 

[Shox Dr]

So glad this made it as the first answer. It's the most correct.

This is why I've never done any of the deletes. I care about my car and don't want it crushed by VOSA. Those road side checks are looking for dangerous modifications that aren't part of the MOT test.

Seen far more often these days, sitting on the hardshoulders. More so than the police. The cynic in me says there's more money in VOSA violations than traffic

 

[Morrisman]

EGR's primarily control NOx emissions, so wouldn't have any effect upon smoke. NOx is also not a measured emission at MoT test.
Whilst it's true that a lot of vehicles 'get through' an MoT with blanked or disabled EGR systems due to the tester not being allowed to remove covers, the same is not true for VOSA roadside checks, so if caught, they could remove the vehicle as it is no longer type approval compliant and fine the driver up to £1k. The same goes for DPF & SCR 'defeats'.

I've seen primarily vehicles that do short, low temperature, low energy journeys, (commuting, school runs, etc.) with EGR related problems, vehicles that get up to a decent temperature for a sustained period on a regular basis suffer less.

I've just pulled the 'Air Injection System' off my bike, that theoretically adds air into the exhaust ports to help combustion of left over fuel, in the exhaust system, to save the planet.

In reality it simply dilutes the exhaust at idle, to defeat emissions testing. And all done on a mass production scale....

 

[Guineafowl]

I've just pulled the 'Air Injection System' off my bike, that theoretically adds air into the exhaust ports to help combustion of left over fuel, in the exhaust system, to save the planet.

In reality it simply dilutes the exhaust at idle, to defeat emissions testing. And all done on a mass production scale....

View attachment 404897

Is that what the US calls a smog pump? Been around for ages, I thought.

 

[GRW]

My main complaint about EGRs, other than another thing to go wrong and often expensive and difficult to replace, is the amount of gunk they put into the intake. Soot mixed with turbo oil is very hard to remove, even with oven cleaner.

We’ve always run diesels, but I think with EGRs, DPFs and AdBlue, and diesel prices, the next one for the wife will be a petrol.

I’m keeping my Td5 Defender, which had its EGR blanked many years ago

The OH's car was changed to a petrol 4-years-ago (2011 low miles Kia Rio 1.4), & I recently bought a 1999 85k miles Skoda Octavia 1.6 petrol to knock around in.
Both deliberately petrol over diesel. You dont get diesel mpg, but you avoid a lot of the modern diesel expensive issues (dpf, dmf, turbos, injectors, injector pumps etc) - so as well as petrol being cheaper per litre (& less purchase cost for the car in the first place), your running costs overall & risks are better IMO with a petrol car now.

 

[Bullet2012]

I have Webasto pre or parking heaters on all my vehicles. What do you want to know ?

If the system was working on the vehicle. As per my question to the poster.

 

[Morrisman]

Is that what the US calls a smog pump? Been around for ages, I thought.

Yes, I've had them on 1970's Chevy motors, it's not new.

 

[Ubique]

The OH's car was changed to a petrol 4-years-ago (2011 low miles Kia Rio 1.4), & I recently bought a 1999 85k miles Skoda Octavia 1.6 petrol to knock around in.
Both deliberately petrol over diesel. You dont get diesel mpg, but you avoid a lot of the modern diesel expensive issues (dpf, dmf, turbos, injectors, injector pumps etc) - so as well as petrol being cheaper per litre (& less purchase cost for the car in the first place), your running costs overall & risks are better IMO with a petrol car now.

I'm of the same mind, my vehicles have been Diesel since the late '90's due to the distance I was travelling, since 2015 the distance has dropped to a tenth of what it was, but I've still habitually used diesel vehicles. Over the next few years we'll be encouraged/shamed/taxed away from diesels, then petrol engines so I'm going to get the petrol version of my current car in the new year.

 

[Bornfree]

Took it for a run today after fitting the new EGR. The EML has gone out, just need an emissions test now to see if it will pass the MOT. Not sure it will as there's still some black soot/smoke coming out.

 

[Ubique]

Take it for a longer run in a higher gear than usual to get the exhaust temperature up so the carbon/soot is dried and pushed out.

 

[doubleboost]

I tested a van a few weeks ago it had its EGR removed .
This is a fail as it was easy to see it had been removed.
A blanking plate can not be seen so no fail.
Personally i hate the things as well as DPF filters and AD blue.
If i had let it go and the car had been respected it would be serious
"bend over" time for me .