Ok....on my 93 Silverado, I want to put a performer TBI intake on there, but I don't want the EGR Valve on there. I'm making a plate to block the EGR valve off. My question is>>> what do I do with the wires that go to the solenoid? Can i run them in a loop? Maybee leave them disconnected? I don't want that damn SES light to come on. What consequences (good or bad) will result in the EGR delete?

 

Your SES light will come on unless you get a chip that has the EGR function disabled. As far as the wires are concerned, you can do whatever you want with 'em. I would tuck 'em away somewhere in the engine compartment where they are out of sight.

-Mark W.
'88 SC Camaro w/ 305 TBI

 

Leave it in, they design it and put it on the car for a reason. Anyway, why go through all the hassle when it will not even give you much more power anyway

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Steve
88 Firebird TBI(WS6),TH700R4 - Open Element, Cat Delete, K&N filter 14*4 element, Flowmaster Catback Exhaust, 180 Stant thermostat, Accel cap and rotor

 

EGR = Carbon Buildup

 

As far as EGR functionality there is no performance added when you remove it. I usually take all mine off just beacuse it cleans up the compartment a little more. There are some guys on the chevelle board that even say you will gain performance from them? Who knows. I would say if you have a 500HP beast leave it off because you are failing emisions anyway. If you have a 200HP weakling, leave it on and dont worry about it.

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69 Chevelle 2dr hardtop blue, bench seats, 12 bolt w/3.73's muncie 4 speed. best 14.5@90

 

IMO, I'd remove it BUT I WOULD ALSO DISABLE THE EGR CORRECTION FUNCTIONS ON THE CHIP, ie spark and fuel. This will correct the drivability problems you will have from operating leaner and having too much spark advance when running with EGR disconnected. Trust me, if you are not going to run EGR, you gotta fix the PROM or you will have the ECU retarding the sparkk advance a lot under highway driving!!!

 

Yup, what fastbroker said. I removed mine to clean up the engine bay a litte, and because it didn't work out too good with the manifold I'm using. I am having some current drivabilty issues, so I can't really comment on any performance benefit, but there should be none.



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Jerry

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89 RS Lt Blue T-Tops T5
355 Crate, Compucam 2040
Pst Front Hotchkis Rear
Edle. TES 3" Flowmaster
Harwood hood, bla, bla, bla...
94 Z28, LT1 6M, Black
Most of the bolt-ons
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EGR is okay in certain vehicles but in most it's not needed for emissions. All the EGR is doing is letting the engine advance timing a little more to get better gas milage. If you have a 500hp engine you CAN make it pass emissions if you have everything tuned with a custom chip. You can pick up a check valve from a junkyard, put that inplace of the EGR and the eprom will detect the drop in vacuum and no SES light. This isn't a good way of doing it since the eprom is going to think you have EGR....so it'll advance timing and you'll get some knock you'll run lean etc.
EGR delete = new eprom burned

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, Jon (350 TBI!)
91 Red My website

 

That's not right, JP. The EGR function actually reduces emmissions. the added spark advance under EGR conditions is necessary in order to burn the inferior combustion chamber mixture, as EGR gasses are already burned and contain no O2, so they cannot burn. EGR reduces NOX, or something like that... If it didn't reduce emmissions, it wouldn't be on there... If you eliminate the EGR gasses from the equation but keep the EGR advance, the flame spreads faster under the non-EGR conditions so the added EGR advance causes knock, not to mention BLM and open-loop hissy fits caused from the fuel changes.

Trust me, been there, done that. Spent about 4 PROM's worth of time on EGR alone. Fun stuff.

 

I read somewhere that some corvettes use a different cam profile so they won't need an EGR valve to pass emissions.

 

You can get the same effect (exhaust gasses in combustion chamber mixture) in several different ways, cams being one variable, ie, properly timed valve overlap can allow exhaust gasses from the previous stroke to be entered into the combustion chamber when the intake valve opens.