| I don't know for sure cause its a 96 and OBD2 but I know for sure a few things about EGR. The EGR is there to reduce combustion temps so NOx doesn't go too high. By putting exhaust gas in the intake, its dilutes the intake charge and there for, you make less power and lower combustion temps. So a few good things about deleting it is: No power loss when the egr is functioning. Your plenum will stay cleaner, and less stuff to go wrong. If your EGR gets stuck open, your car will idle like crap.. The EGR is checked mostly by a temp sensor located in or near the EGR port. If the EGR is open, exhaust gas is hot and the temp sensor will see the "Rise" in temp and know that the EGR is indeed working. I've done the trick where you put a resistor in the place of the temp sensor and trick the ECU into thinking that the EGR is working. For a Z32 (OBD1 at least) its a 68K ohm resistor. I put in the a resistor in my 91TT because my EGR was failing and it was throwing codes. After I pulled the plug and capped my EGR, the resistor is keeping my CEL off.. But again my car is OBD1. I can't imagine that OBD2 is much different. Lastly, I was talking to a smog guy about EGR function and he told me that they can't check for EGR operation as its only in use during high temp operation of the motor. He says that if your NOx is high, then you have other problems but a good running car does not need the EGR to pass. They do look to see if the EGR is still there but good luck finding anything on our cars. You can't even really see our air filters, let alone the EGR. Hope that helps.
Ken 91TT P.s. Get a OBD2 scanner. You can pull any codes off the ECU and as long as you are code free, a non working EGR shouldn't make you fail a sniffer test.
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