at certain times it pulls exaust gas from the exaust crossover in the heads and puts it in the intake, right?

 

yep that's how it works, controlled by vacumn and a senser now, the first ones were just vacumn controlled

 

Reduces your NOx buy reducing your combustion temperatures. It also reduces your MPG requiring you to burn more fuel, and expel more gases… hmmm EPA hmmm

Ron

 

The Lowdown on Code 32 (EGR)
http://sethirdgen.org/egr.htm



1985-1989 V8:
http://sethirdgen.org/egrii.htm

 

Welllll, actually, to be nitpicky, it's controlled by the ECM through the EGR solenoid, which meters the vacuum controlling the valve. On TPI cars, MAF vehicles also had a temp switch installed in the EGR valve that allowed the ECM to determine if the EGR valve is functioning properly. Later SD (TBIs are SD, too) cars got rid of that switch because the computer was now smart enough to figure it out on its own. No real "sensor" involved.