calvin280zxt Posted February 17, 2014 Share Posted February 17, 2014 Just installed a wide band as I plan megasquirt this year. My car has always been a gutless bag during warmup from about the bottom of the temp gauge to a third of the way. It's like a lightswitch all of a sudden it goes from super rich 10-1 to max lean 20-1. Sometimes dies and then just like it came it starts to run fine at 13-1. stock (as far as this is concerned) 82 280zxt. I don't know much about these funky l-jets but I can only assume there is a after start 'table' and once it switches to warmup it leans out then once close to opp temp it goes to a run table and all is well. But what coul cause this only during warmup Quote Link to comment Share on other sites More sharing options...
ttodhunter Posted February 20, 2014 Share Posted February 20, 2014 Hmmm... So many possibilities. Is the O2 sensor heated/ heater wire hooked up? If the sensor isn't warmed up, it may give a false lean reading. If that's not the case, and it's definitely engine temperature related, you're right about the "table". That table is controlled by the coolant temp sensor which alters a circuit in the ECU which in turn adjusts injector pulse width and maybe opens the IAC. That said, there are three things to check out- CTS, ECU, IAC. My $.02. Quote Link to comment Share on other sites More sharing options...
calvin280zxt Posted February 20, 2014 Author Share Posted February 20, 2014 No heater on these old o2 sensors. Gonna check some sensors but I can't think why it wouldn't always affect it Quote Link to comment Share on other sites More sharing options...
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