EGR: Put it back or tune it out?
Thread Starter
Joined: Nov 2005
Posts: 7,615
Likes: 65
From: NYC
EGR: Put it back or tune it out? I’m a little old school and always hated EGR valves. My "new" car, the ‘99 TA, has some surging. Removing the EGR seemed to cure some of it but when I was at the dyno, they said I’m losing power due to the missing EGR. Of course, the SES light is on.
I know the 2002 cars had no EGR valve. Is there a way to tune it out via say LS1Tune and have the car run like a 2002? Or should I get a new EGR valve and put everything back in.
The surging is annoying. It’s like I’m letting up on the gas then hitting it again-all while holding it steady. Sometimes it’s not too bad. Could this be the TPS? It’s a high miler with 155K+. It runs good, no oil consumption or noise. I’m sure the O2 sensors are original, they’re next to be changed.
Thanks.......
I know the 2002 cars had no EGR valve. Is there a way to tune it out via say LS1Tune and have the car run like a 2002? Or should I get a new EGR valve and put everything back in.
The surging is annoying. It’s like I’m letting up on the gas then hitting it again-all while holding it steady. Sometimes it’s not too bad. Could this be the TPS? It’s a high miler with 155K+. It runs good, no oil consumption or noise. I’m sure the O2 sensors are original, they’re next to be changed.
Thanks.......
How did you seal the hole at the top of the intake manifold? Maybe it has a leak which is causing the surging. Oh, and definetely leave the EGR off and tune it out. Weight reduction and makes the engine bay less cluttered.
Thread Starter
Joined: Nov 2005
Posts: 7,615
Likes: 65
From: NYC
I used the GM seal for the intake manifold. Aftermarket plate for the exhaust manifold port. No leaks here.
After tuning it out, will it pass the emission test?
After tuning it out, will it pass the emission test?
Last edited by Paul Bell; May 19, 2009 at 12:12 AM.
My vote is to leave it off. One of the most popular mods for 98-00 cars is to upgrade to the LS6 intake, ditching the EGR in the process. I really don't think deleting the EGR will reduce power and upgrading the intake is a proven gain. Tuning to eliminate the CEL isn't a big deal and I'm sure there's a shop close to you that can handle it.
Thread Starter
Joined: Nov 2005
Posts: 7,615
Likes: 65
From: NYC
Hey 5.3, what's a CEL? It ain't in the LS1Tech Commonly Used Acronyms list.
OK guys, what do I have to do to tune out the EGR?
Is it worth it to purchase LS1edit?
OK guys, what do I have to do to tune out the EGR?
Is it worth it to purchase LS1edit?
If you have to pass emissions you better leave it on...EGR valves bring down the NOX values (I think) showed on an emissions test.
Even if its just a visual, anyone with half a brain should realize that the EGR valve is missing.
Even if its just a visual, anyone with half a brain should realize that the EGR valve is missing.
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TECH Resident
Joined: Aug 2003
Posts: 970
Likes: 4
From: England UK
As far as i know that when the engine is heated up the EGR valve is closed, so providing you car is warm for the emissions test they will know no different. I've passed emission tests with !EGR, !AIR but emission tests seem to be different depending on your area. I have tuned it out using HPTuners. Is there someone in your area with an LS1 with !EGR and passed?
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Verdad Gallardo Thread Starter
Joined: Nov 2005
Posts: 7,615
Likes: 65
From: NYC
I've ordered a new EGR valve and will be putting the whole mess back on next week. It's not a matter of the visual inspection, most places here in NYC employ low paid newbies to do the inspections and they wouldn’t know the difference between an engine and a squirrel on a treadmill.
When the inspection machine is connected to the car, it’ll see the codes from the missing EGR and the "not ready" code and it won’t complete the test.
When the inspection machine is connected to the car, it’ll see the codes from the missing EGR and the "not ready" code and it won’t complete the test.
Teching In
Joined: Aug 2007
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