I've been studying the forums, HTKYSA, and a factory manual to learn as much as I can about my Hitachi and the associated emissions systems. I may have given myself information overload. I have a simple question to check my newly obtained knowledge.

 

My situation: 83 GL wagon, 4wd, may or may not be a California model. The O2 sensor is gone (port plugged). The emissions/vacuum system has been modified by a po. I can't find an ECM. It has either been removed or I simply can't find it.

 

My question: From what I have read here and in the manuals, my hitachi will run rich if it is not receiving feedback from the o2/ECM?

 

I read someplace that the hitachis are jetted rich and the ECM leans out the mixture to suit conditions. The car runs rich. Am I correct in my thinking?

 

The caveat: Compiling parts for a weber swap in a couple weeks.

... The caveat: Compiling parts for a weber swap in a couple weeks.

 

Yes, the Weber Swap is Awesome, but in the meantime, you can check your main fuel Jets on the craptachi carb, to be set at ~ 116 for Low stage (Primary) and ~ 140 for High stage (Secondary) then you can forget about the electronic control / vacuum operated High stage (Secondary), and Modify your craptachi carb to have it Mechanically operated, like in the Webers; taking ideas from this Writeup / Video on this link:

 

~► http://www.ultimatesubaru.org/forum/topic/147163-mechanical-conversion-on-hitachi-carburetors/

 

Good Luck! ... Kind Regards.

Generic exhaust often has O2 port, so could be replacement y-pipe on a non-feedback system.