EGR valve.....
Burning Brakes
Joined: Feb 2004
Posts: 958
Likes: 1
From: In the Beautiful Shenandoah Valley of VA
It had one from the factory. Whether it should have one is probably up to you. It was designed to cool the combustion temperatures to lower Nox emissions. Removing it might increase emissions, possibly create conditions conducive to pre-ignition, and may be illegal if your state does vehicle inspections. None of these problems is difficult to overcome.
Steve
Steve
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
'73 was the first year for EGR across the board....it allows innert pre burnt exhause gasses into the intake to allow for leaner gas, and less incoming air, at those off idle light throttle traffic conditions....
it makes the engine behave like it's less displacement.....
I think it does nothing for economy, but hurt it....
disconnecting it without re doing the carb settings in the off-idle transferr circuit will make the car bog crazy in traffic, but run fine at WOT....assuming everything else is right....
the early intake manifolds were very restrictive of overall flow rates due to the extra passages taking up plenum/runner room in the designs....
EPA lovers think it all was great in cleaning up the 'air' but in fact it did nearly nothing, the clean up was due to DPFI and closed loop operation, but that's another thread....
it makes the engine behave like it's less displacement.....
I think it does nothing for economy, but hurt it....
disconnecting it without re doing the carb settings in the off-idle transferr circuit will make the car bog crazy in traffic, but run fine at WOT....assuming everything else is right....
the early intake manifolds were very restrictive of overall flow rates due to the extra passages taking up plenum/runner room in the designs....
EPA lovers think it all was great in cleaning up the 'air' but in fact it did nearly nothing, the clean up was due to DPFI and closed loop operation, but that's another thread....
