83hockeywagon Posted February 19, 2015 Share Posted February 19, 2015 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. Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted February 19, 2015 Share Posted February 19, 2015 ... 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. Link to comment Share on other sites More sharing options...
Gloyale Posted February 19, 2015 Share Posted February 19, 2015 Generic exhaust often has O2 port, so could be replacement y-pipe on a non-feedback system. Link to comment Share on other sites More sharing options...
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