EGR "un-delete"
Thread Starter
Instructor
Joined: Mar 2012
Posts: 170
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From: NH
EGR "un-delete"
I have a 93 LT1 that a PO deleted the AIR and EGR system on. Fortunately the headers they put on have the tapped holes for the AIR tubes. I do not intend to add the AIR system back in as emmissions are not a concern, but I would like to add the EGR back in. I should be able to get away with just the pass side AIR tube that goes from the header to the intake manifold right? I could then just block off the check valve. OR, do I need to have the drivers side AIR tube connected as well for some reason? I would think that the EGR system wouldnt care that it is only getting the exhaust gas from one side, but I just wanted to check. They left the EGR valve, solenoid, and vacuum lines intact, it is just the AIR pump and associated plumbing that is missing. I was able to locate a pass side AIR tube, just wondering if I need to pick up the drivers side one as well.
Le Mans Master
Joined: Mar 2001
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From: Life is just one big track event. Everything before and after is prep and warm-up and cool-down laps
Cruise-In III Veteran
Cruise-In IV Veteran
St. Jude Donor '12
IIRC the stock tube from the passenger header had a port for the driver side to connect to.
I guess you could make it work with a home made tube to the intake.
I guess you could make it work with a home made tube to the intake.
Thread Starter
Instructor
Joined: Mar 2012
Posts: 170
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From: NH
Well I can buy the pass side tube for ~$50-60 used so no need to do anything homemade to the intake. The question is, can I just block off the port to the drivers side or do I have to have that drivers side tube too? I guess it would be if something had to be balanced for some reason, I dont know just trying to see if I am missing something. I recently found out that the cats are hollowed out, so I have no use for reinstalling the entire AIR system, I want just the bare minimum to make the EGR work in order to improve milage and prevent detonation.
Pro
Joined: Aug 2009
Posts: 725
Likes: 4
From: Plano, TX
Personally, If you don't have visual emmision testing then I would leave it deleted. Those EGR valves are known to stick open and cause a huge vacuum leak. At $75 a pop they are expensive to replace.
If you must, then your plan will work with only the passenger side tube. The EGR valve and doesn't know where the exhaust comes from so it shouldn't set any codes.
If you must, then your plan will work with only the passenger side tube. The EGR valve and doesn't know where the exhaust comes from so it shouldn't set any codes.
Race Director
Joined: Apr 2000
Posts: 15,344
Likes: 4,008
From: Texas
I have a 93 LT1 that a PO deleted the AIR and EGR system on. Fortunately the headers they put on have the tapped holes for the AIR tubes. I do not intend to add the AIR system back in as emmissions are not a concern, but I would like to add the EGR back in. I should be able to get away with just the pass side AIR tube that goes from the header to the intake manifold right? I could then just block off the check valve. OR, do I need to have the drivers side AIR tube connected as well for some reason? I would think that the EGR system wouldnt care that it is only getting the exhaust gas from one side, but I just wanted to check. They left the EGR valve, solenoid, and vacuum lines intact, it is just the AIR pump and associated plumbing that is missing. I was able to locate a pass side AIR tube, just wondering if I need to pick up the drivers side one as well.
If the car runs fine, this sounds like a waste of time, money and effort.
Thread Starter
Instructor
Joined: Mar 2012
Posts: 170
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From: NH
I doubt the car was re-tuned, it had the factory PROM. Wouldnt it have an aftermarket PROM if it was tuned? Also, I have had to replace the ECM/PROM, so now I know for a fact it was not tuned. The car does run fine generally, but the SES light has come on during highway operation for the EGR System and I can see that it is intermittantly retarding the timing quite a bit when I data log so the KS circuit is having to take over. I am going to have the car tuned hopefully by the end of the summer because it has headers and a 52mm Throttle body so I could in theory leave the EGR out, but I figure its a good thing to have in there and for about $60 and an hour or two I can put the motor closer back to the way it was intended. From my research, it seems that the EGR is actually a good thing to have in there and not a very good thing to remove, right?
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Its your car, but if it runs ok, I would leave well enough alone...I deleted my egr and air and saw no change in my knock counts or gas mileage. Small block Chevys ran for years without egr valves and had no problems at all......but its your car...
....WW
....WW
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