Please explain EGR.......
Le Mans Master
Joined: Dec 1999
Posts: 8,540
Likes: 1
From: And on the fifth day, subpoenas were served to Obama senior staff
Re: Please explain EGR....... (fade_to_black)
The exhaust gas re-circulation valve allows, under certain specific circumstances, a small amount of exhaust gases to re-enter the combustion chamber for the purpose of decreasing combustion temperatures resulting in a decrease in the production of Oxides of Nitrogen (NOx). EGR is only active in certain circumstances, never at wide open throttle, and generally only at part throttle. An EGR failed in the open state will cause hesitation and bogging, rough running. A EGR failed in the closed state will cause knock (and resulting reduction of timing and loss of HP) and increase in mid load/rpm NOx.
HTH
Pete
HTH
Pete
Le Mans Master
Joined: Feb 1999
Posts: 7,254
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From: Custer SD
Re: Please explain EGR....... (fade_to_black)
It stands for Environmental Government Regulation.........no really, it stands for Exhaust Gas Recirculation. By admitting exhaust gas into the air/fuel mixture, oxides of nitrogen (bad) are reduced because the fuel mixture doesn't burn as hot (efficiently). Combustion temperatures are cooler than with if no exhaust gas were in there at all. It also has the same effect as an octane booster. Both reduce the tendency for knock. It has the same effect of richening up the air/fuel ratio, and in fact you can have a chip burned to do just that and shut off EGR. EGR heats up your intake charge and adds deposits to your intake passages and intake valves.
Team Owner
Joined: Jun 1999
Posts: 71,447
Likes: 6
From: Miami bound
CI 4-5-6-7 Veteran
Re: Please explain EGR....... (PeteL)
The exhaust gas re-circulation valve allows, under certain specific circumstances, a small amount of exhaust gases to re-enter the combustion chamber for the purpose of decreasing combustion temperatures resulting in a decrease in the production of Oxides of Nitrogen (NOx). EGR is only active in certain circumstances, never at wide open throttle, and generally only at part throttle. An EGR failed in the open state will cause hesitation and bogging, rough running. A EGR failed in the closed state will cause knock (and resulting reduction of timing and loss of HP) and increase in mid load/rpm NOx.
HTH
Pete
HTH
Pete
:confused:
Le Mans Master
Joined: Jul 2001
Posts: 8,184
Likes: 3
From: Santa Maria, CA
Re: Please explain EGR....... (90Ragtop)
$600.00? run! run far away. That valve could be no more than 120.00 at the dealer, 40-50 at the parts store. Plenum is EASY to get on and off. Valve is easy too. 20 minute job at most. Also see Juliet's thread.
Le Mans Master
Joined: Feb 1999
Posts: 7,254
Likes: 0
From: Custer SD
Re: Please explain EGR....... (fade_to_black)
$600!! Hope it comes with vaseline and they let you have a reacharound!! You can get a chip programmed to eliminate EGR for under $300. You can fix it yourself if it actually is the EGR valve for under $100. It's not all that hard to replace.
Le Mans Master
Joined: Jul 1999
Posts: 7,072
Likes: 4
From: Maryland
Re: Please explain EGR....... (PeteL)
An EGR failed in the open state will cause hesitation and bogging, rough running. A EGR failed in the closed state will cause knock (and resulting reduction of timing and loss of HP) and increase in mid load/rpm NOx.
~Juliet :seeya
