April 24, 2013

Bye bye EGR proportional

There were several different ’emissions control’ systems implemented on the SAAB 99 engine starting in 1975. My car has one of the more reasonable designs which is called EGR proportional. Rather than using an air pump which can rob power, it uses a more passive ‘air pulse’ which recirculates exhaust back into the intake system.

I developed an exhaust leak and discovered that one of the pipes had cracked. I took it to Troll Motors and Nate made me feel confident that I should just remove it and cap off the fittings.

I’ll likely not remove all of the EGR proportional, but this piece has to go.