2.2 OBD2 swap into ‘85 Brat

[el_freddo]

Not having a charcoal canister with the purge control still in use makes sense. 

From what I understand of this setup is the charcoal canister collects vapour from the fuel tank vent system which is then burnt off in the cylinders when the ECU determines the right conditions are present - usually a cruise and light load revs. 

No charcoal canister means no vapours which is effectively just sucking air and leaning out the fuel mixture. Add in a faulty valve that could be open all the time and you get your stumbling revs/misfire like running symptoms. 

[Greentractorfarmer]

I got ahold of a canister from an ‘83 today, and will try the your hookup layout, thank you! It feels like several symptoms are explained by the lack of charcoal canister.

Full disclosure, I had eliminated the canister five years ago when the 2.2 was installed to my 83 wagon. Because that swap had worked well, I just forgot about that until I saw the canister I picked up today. Which reminds me of having seen it in the original donor car.