EGR and AIR
TECH Fanatic
Joined: Jan 2005
Posts: 1,162
Likes: 0
From: St. Augustine, FL
Pro's :
- a little more space around the engine (only pro IMO)
Con's :
- wont pass emissions inspections
- will throw a code if you take out the air pump
- (This is straight out of a chiltons manual) : The EGR valve opens and closes in response to vacuum or electrical signals to admit exhaust gases into the air/fuel mixture. The exhaust gases lower peak combustion temperatures, reducing the formation of NOx. The valve is closed at idle or WOT, but is open between the two extreme positions. (Further into the reading it says this) : Too little or no EGR flow allows combustion temperatures to rise which could result in spark knock (detonation), engine overheating and/or emission test failure.
IMO, if you have a properly functioning coolant system on your engine, I dont think that last thing is an issue but, just thought I'd mention it since its in the book. I took it all off mine. I can see a difference but there's nothing much more than that.
- a little more space around the engine (only pro IMO)
Con's :
- wont pass emissions inspections
- will throw a code if you take out the air pump
- (This is straight out of a chiltons manual) : The EGR valve opens and closes in response to vacuum or electrical signals to admit exhaust gases into the air/fuel mixture. The exhaust gases lower peak combustion temperatures, reducing the formation of NOx. The valve is closed at idle or WOT, but is open between the two extreme positions. (Further into the reading it says this) : Too little or no EGR flow allows combustion temperatures to rise which could result in spark knock (detonation), engine overheating and/or emission test failure.
IMO, if you have a properly functioning coolant system on your engine, I dont think that last thing is an issue but, just thought I'd mention it since its in the book. I took it all off mine. I can see a difference but there's nothing much more than that.
Hes right about everything except the AIR pump won't throw a code if it has a good fuse in the junction block. It might be different on 93's thougg. I'd take out the AIR to free up lots of space on the drivers side but the EGR serves a purpose.
Joined: May 2004
Posts: 1,593
Likes: 267
From: Halfway back on the Highway to Hell...again!
If you do not have a bigger cam than stock, it will be a little harder on gas. A lager cam will allow self-egr with a longer duration. Any duration under 214@.050 will need an egr to optimize the engine performance. I got this info from a GM engineer at a Super Chevy Show. Oh, and he works with Jon Moss, go figure...
TECH Fanatic
Joined: Jan 2005
Posts: 1,162
Likes: 0
From: St. Augustine, FL
When I took the AIR pump out of my 96 SS it turned on the check engine light. When I scan it, I get a code pointing at the air pump. Maybe its different between OBDI and OBDII. I dont know specifics, just that mine got a code.
TECH Enthusiast
Joined: Oct 2004
Posts: 607
Likes: 1
From: Anna, OH
I took my AIR system off a few days ago, but kept the EGR. No code so far.
BTW, taking that steel crossover tube out that runs across the lower front of the engine is a big PITA! I had to cut it into 4 sections and each cut was very difficult.
Still, the end result was well worth it. I can't believe how easy it is to get to everything now! I didn't see any performance change though--as others have also said.
BTW, taking that steel crossover tube out that runs across the lower front of the engine is a big PITA! I had to cut it into 4 sections and each cut was very difficult.
Still, the end result was well worth it. I can't believe how easy it is to get to everything now! I didn't see any performance change though--as others have also said.
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TECH Enthusiast
Joined: Feb 2005
Posts: 633
Likes: 4
From: Phoenix, AZ
Originally Posted by LTSpeed
BTW, taking that steel crossover tube out that runs across the lower front of the engine is a big PITA! I had to cut it into 4 sections and each cut was very difficult.
The AIR pump is only for when the engine is cold to reduce emmisions. Once it is warmed up there is no use for it, hence why you hear it shut off after engine is warm. For emmision purposes, if they are smart enough they will see that it has been removed. But from my experience, they are not that smart.
You will not fail a sniffer because of the removal though, because you are supposed to have the car warmed up when you get there. EGR I would leave on because it actually does serve a purrpose, and you can barely see it on the engine. Also, it doesn't get in your way when working on the car.
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