I have all the smog off my car with the EGR valve still on the intake. Is the valve staying open all the time? Do I need to remove the valve and cap the hole off? Sorry for all the questions, But thanks for the advice guys. Keep up the good work.

 

Need more info. The EGR if not operating correctly will cause rough idleing, loss of fuel economy etc,etc,etc. You simply cannot pull off the emissions equipment without having problems. If it is fuel injected you will have a whole host of problems. Give me more info, eng, year, FI or carb and I'll tell you what to do. I'll bet right now it's running like crap. PM me or put up a post. Dan

 

I have a 1988 GTA with a 350 TPI. It is stock except for a ported plenum, removed screens, cold air induction, flowmaster and removed smog. I took the AIR out of the manifolds and plugged them off, I removed the black boxabove the passenger valve cover and the hoses, and I also removed the smog pump. The EGR is still on the intake along with vacuum junction that bolts up to the coil mount. The cat is also removed. I hope this is enough detail. Thanks for your reply.

 

With the vacuum line disconnected from the EGR it should stay closed. That would be the way you want it if you are not going to use it. The problem is this, EGR dilutes the fuel/air mixture with exhaust gas to reduce peak combustion temperatures and the production of NOx emission. The ECM fuel delivery mapping takes into account this factor so operating without it may cause some driveability problems. The junction you refer to is the vacuum solenoid controlled by the ECM. It is controlled primarily by the VSS sender and TPS postion. EGR generally operates in the area of 40-70 mph, that is the time most NOx is produced. The problem here is that if you disconnect it you may fool the O2 sensor operation. Remember with an electronically managed engine all parameters are controlled by ECM programming. The AIR injection system or air pump is a pretty benign change, but disconnecting the EGR may and most probably will cause a problem. O2 operation looks at the amount of residual oxygen in the exhaust gas and anything that changes that will cause poor fuel mileage and generally poor performance. I would leave it alone unless you want to get into reprogramming the prom.