Even after all the work, distributer rebuild, carb rebuild, new egr valve, replaceing all the vacuum leaks etc, I still had the afterfire, especially on the two-three upshift.  Today I broke down and put a quarter in each of the pipes near the reed valves, and viola!!!!! No more afterfiring, I mean this car sounds like a normal car, the idle is super smooth now.  I cannot believe that this was causing me so much frustration.  So again, thanks for the site, the old Brat is now going to be driven on a daily basis, still have to reseal the the oil pan and the c/s seal but super happy with this simple mod.

What's this now? Does this only apply to a specific era series engine?

If you do a search on here you can find out more and probably some pictures as well but basically you get to delete your ASV valves and everything associated with them.  The quarter goes in place of the metal tube down at the bottom of the head and you tighten it back into place with the original nut.  I did this on my former coupe and before that my sedan and never looked back.  Those reed valves never really work right at this point in life.  I believe they have something similar with the EA82 cars too but its been a long time since ive ventured under the hood of one of those.  

Here is a pic from my EA81 showing how a quarter happens to be a perfect fit to block off the Air Injection System at the exhaust manifold. 

 

 It is good to hear you fixed your Brat!

 

And yes, Thank you USMB! 

Edited November 26, 201312 yr by 81EA81

Hi...87 gl hatchback 4wd, anything else need to be done after blocking it off? Any cons, like pros and cons? New to Subaru...