I wanted to know what was the last year that the LS1 had a EGR system. I saw a 99 T/A and it had a cam and other bolt ons. It did'nt have the EGR valve So I guess he took it off cause I also saw that he 2000 a system. So if you get stuck with the EGR system how have is it to take off?

 

I thought that the 2001 and 02 models had the deleted EGR system because of the LS6 cam and Intake? My 02' Z doesn't have one.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by slppontiac:
<strong>I thought that the 2001 and 02 models had the deleted EGR system because of the LS6 cam and Intake? My 02' Z doesn't have one.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">This is correct.

 

Yes, 2000 was the last MY for EGR on F-bodies.

 

camarossls1 you are correct. 98-00 received the egr because of the ls1 intake. since the ls6 intake provision was made for 01-02 it was not necessary to run egr any longer.

 

Don't want to be splitting hairs here....

The EGR system on the 2001 and 2002 was eliminated because of the extended overlap time brought about by the new cam. The extended overlap yields more scavenging, and a cooler intake charge. The reduction in ignition temperatures reduces NOX emmissions.

from how I understand it.

<small>[ August 14, 2002, 02:54 PM: Message edited by: NoGo ]</small>

 

NoGo:
You got most of it.

EGR = Exhaust Gas Recirculation. Overlap basically achieves this since both valves are open at the same time. The "truck" cam in the 2001 and 2002 F-body has more overlap than the 1998-2000 cam, which negates the need for a separate EGR system.

As fas as a "cooler intake charge", I think its the other way around. The exhaust gas would heat up the intake charge.

--VIP1

<small>[ August 14, 2002, 10:21 PM: Message edited by: VIP1 ]</small>

 

OK, so help me out here people? Does the 01' and 02' F-bodies have the truck cam or the LS6 cam. I was told the LS6 cam, but I could be wrong? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

 

They have the LQ4 truck cam, NOT the LS6 cam. It’s the LS6 intake that they get, not the cam.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by VIP1:
<strong>NoGo:
You got most of it.

EGR = Exhaust Gas Recirculation. Overlap basically achieves this since both valves are open at the same time. The "truck" cam in the 2001 and 2002 F-body has more overlap than the 1998-2000 cam, which negates the need for a separate EGR system.

As fas as a "cooler intake charge", I think its the other way around. The exhaust gas would heat up the intake charge.

--VIP1</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Sorry for the confusion. The newer F-bods DID NOT come with the LS6 cam, my bad. RPM is correct, we only got the new fangled LS6 intake.

VIP1, back to splitting hairs.....

Recirculating the exhaust gas back into the intake charge doesn't "cool" the charge directly. The "cooling" effect takes place at combustion. The introduction of previously combusted gases into the intake charge loweres the COMBUSTION temperatures. This lowers NOX

Nerd mode ON

For example:

An intake charge made up of 100% clean air (with 21.0 normal atmospheric oxygen content) will combust at a temperature of around 3000 deg (just estimating).

An intake charge made up of 80% clean air and 20% previously combusted air will yield an overal lower combustion temperature. Previously combusted air containing a usuable oxygen content of 12% (if I remember correctly) and the normal atmospheric air of 21.0% will combine to give us an intake charge oxygen content of 19.2%. The lower oxygen content (among other things) does not contribute as much energy chemically to the combustion reaction, and thus lowers combustion temperature. Lets say this mixture gives us a firing temperature of around 2700

The production of NOX does not occur until combustion temperatures in excess of 2800 deg F. At these combustion temperatures, NOX begins to form and increases exponentially, with the increase of combustion temperature after this point. By keeping the combustion temperatures lower (via adding previously combusted gas with a lower contributable energy content) the NOX emmissions will be reduced.

Nerd mode off.

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

I deleted my AIR system and EGR with LS1 edit on my '00. I get no codes now. The EGR is not that hard to take off, 2 bolts hold the valve and bracket to the block, and then 2 more in the manifolds for one of the tubes and the one on the top of the intake. Just plug the holes, most places sell block off plates for these now and you just can get a plug from Ace Hardware, Lowes or whatnot. The AIR is alittle harder, and you have a pump on the driver side behind the signal light, its just 4 bolts, and then pull all teh damn hoses out. And plug the up as well. Its more time consumong than it is hard, but it is a hell of a lot easier to get my plugs and work on the passenger side now with all that BS off. I broke the vacum regulator in the back off and pluged the vacum line. Saved me all kinds of room. Its not hard though. Just tape up the lose connectors when done. Have fun <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

 

Well those EGR explanations are very thorough and informative. I heard that the EGR is only affective when the car is idling and the engine is cold. After the car is completely warmed up the EGR vavle is completely inactive. Someone correct me if I'm wrong.

I have no clue what the AIR system does. Can someone explain how it helps emissions?

Mike

 

AIR pumps fresh oxygen into the exhaust to light off the cats sooner. That’s it.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by buschman:
<strong>Well those EGR explanations are very thorough and informative. I heard that the EGR is only affective when the car is idling and the engine is cold. After the car is completely warmed up the EGR vavle is completely inactive. Someone correct me if I'm wrong.

Mike</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">The EGR system is active at all times during normal driving conditions other than "performance" driving (read: when you have the gas pedal mashed to the floor). When you go Wide Open Throttle, the EGR valve closes to cut the emmissions crap and give you maximum power.

I would assume that it is the opposite of what you have heard. The EGR valve would probably stay closed for the first moments upon start-up, then begin to open as the car gets into closed loop mode. But this is only my speculation. I don't have any proof to back it up.

<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

NoGo,
Splitting hairs huh? Your response post was much longer and more detailed than mine. It was a good description though and jogged my memory on the details of the process.

buschman,
The AIR system is only on for a short time after the car starts up, after that it turns off.

--VIP1