What does the EGR valve do?

Submitted: Friday, Jul 02, 2004 at 20:39
ThreadID: 14321 Views:1705 Replies:5 FollowUps:10
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Another question that perplexed me on the way home from Warrnambool. What does the EGR valve do? Apparently the Patrol has EGR valve seals that need replacing, and theyre metal I am led to believe. So over to the EO Knowledge base for elucidation. and thanx in advance
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Reply By: Member Eric - Friday, Jul 02, 2004 at 20:43

Friday, Jul 02, 2004 at 20:43
Exaust Gas recerculator . Allows exaust gas into the combustion chamber ,was introduced in the mid or early 80's & used to cool down cylinders & suposibly burn some unburnt fuel
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Reply By: Baz (NSW) - Friday, Jul 02, 2004 at 20:46

Friday, Jul 02, 2004 at 20:46
Bonz have a look at this.

Click here

Baz.

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Follow Up By: Member Eric - Friday, Jul 02, 2004 at 20:51

Friday, Jul 02, 2004 at 20:51
Ok I remembered 2 of its 3 usess lol forgot the preignition lol

It was a long time since my aprenticeship
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Follow Up By: Bonz (Vic) - Friday, Jul 02, 2004 at 20:54

Friday, Jul 02, 2004 at 20:54
THATS the problem my spark plugs have never been replaced in the 3.0l TDI..so whats it do in a diesel?
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Follow Up By: Member Eric - Friday, Jul 02, 2004 at 21:06

Friday, Jul 02, 2004 at 21:06
who said anything about spark plugs ?
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Follow Up By: Bonz (Vic) - Friday, Jul 02, 2004 at 21:09

Friday, Jul 02, 2004 at 21:09
Baz's link.
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Follow Up By: Baz (NSW) - Friday, Jul 02, 2004 at 21:36

Friday, Jul 02, 2004 at 21:36
Sorry i don't know more about it, didn't cover this in my motorcycle fixing days, i'll be down your way soon leaving to go to Eildon tomorrow then after Eildon heading for JohnRs for a few days, maybe i'll see ya if tour not doing anything.

click here

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Follow Up By: Bonz (Vic) - Friday, Jul 02, 2004 at 21:49

Friday, Jul 02, 2004 at 21:49
Heading to Melb for Challenge Marshalls meeting Sunday and back there Monday arvo, back home Tues nite, drop me an email if you're about and I might be able to find Johns place and catch up say gidday, tell a few yarns and whatever. I memmsg you my mobile no.

Regards
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Follow Up By: Baz (NSW) - Friday, Jul 02, 2004 at 21:54

Friday, Jul 02, 2004 at 21:54
No worries, haven't been to this part of VIC before looking forward to it.

Baz.
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Reply By: Bonz (Vic) - Friday, Jul 02, 2004 at 20:57

Friday, Jul 02, 2004 at 20:57
I have also heard that a failure of the valve renders the vehicle stationary? Is that correct?
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Follow Up By: GOB & denny vic member - Friday, Jul 02, 2004 at 20:59

Friday, Jul 02, 2004 at 20:59
goodday bonz
which area of western vic do you live in we used to live at penshurst

steve
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Follow Up By: Member Eric - Friday, Jul 02, 2004 at 21:07

Friday, Jul 02, 2004 at 21:07
not so
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Follow Up By: Bonz (Vic) - Friday, Jul 02, 2004 at 21:10

Friday, Jul 02, 2004 at 21:10
Terang is the BonzAbode, just north of JohnR's place.
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Reply By: Moz - Friday, Jul 02, 2004 at 21:09

Friday, Jul 02, 2004 at 21:09
Hi Bonz,
Its main role is (as has been said) to reduce the temperature in the combustion chamber. This reduces nitrogen oxides emissions (NOx) which are ozone depleting gases. With emission regulations becoming tougher overseas and locally, things like EGR systems are becoming more common.
The exhaust gas recirculation is controlled by valve with a small electric motor, this motor is ECU-controlled normally.
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Reply By: mitch - Friday, Jul 09, 2004 at 21:34

Friday, Jul 09, 2004 at 21:34
Just a bit more imfo on your egr valve.

When polutants became an issue to people it was discovered maybe 20odd years ago that while high combustion temps lead to a greater efficiency for petrol and diesel engines ( do any of you rember l think it was isuzu , had a ceramic engine , thats cylinders, a lined combustion camber and piston top ) high flame front temps ,remembering that your fuel burns in a controled fashon it dosnt explode , produced large amounts of nox so a meathod of lowering the flame front was done by introducing an inert substance , yourexhaust gas .

Early systems in the mid to late 70s yoused vacuum of the engine to this as high revs/vacuum produced high combustion flame front temps thus lots of nox.
High vacuum would open the egr valve thus introducing the gas that would delute the incomming charge of fuel,lowering the flame front temp and reducing the emmissins of nox.

N
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