Join Now
International Automotive Technicians Network
Re: Help me help my old man neighbor with a '79 T-bird
Posted to Emissions Forum on 10/17/2012

I agree with Robert and Olle.

I've seen it dozens of times; the EGR flows too much for whatever reason, and drops manifold vacuum far enough to cause power enrichment.

CO and NOx are typically caught in a see-saw battle on those old vehicles. You just need to find a way to find a happy medium, and I would start with a properly calibrated EGR valve.


Michael Barry
Quick Stop Smog & More
Sacramento, California, USA