Quote:
Originally Posted by 97-civic-ex
On the HX O2 sensors are the same for both cali and fed. Only ecu is different. ... If o2 sensors were different you would not be able to swap ecu's without swapping O2 sensors as well.
|
Yup. You're right. I was just searching. And both the Cali and the Fed MT HXs had the 5-wire wideband. But it seems the CVT HX had the 4 wire narrow band O2. So not all the HX models had that 5 wire!
It's just that Cali/Fed was no longer the important distinction. MT/CVT was.
Quote:
Originally Posted by 97-civic-ex
Edit:
Oh and a lean burn motor doesn't 'need' a wideband. The 3-stage p2j ecu runs the d15b with a single wire narrowband o2 sensor just fine with lean burn. It all operates in open loop anyway, which means the o2 sensor is out of the equation and it controls fuel based off a predetermined map/setting.
|
Seems this is true too. So interesting! Here is a guy with lots of gauges who swears lean burn is closed loop operation in all conditions except cold:
http://ecomodder.com/forum/showthrea...tml#post248581
But if you look further down on that first page you'll see Ryland state essentially what you have said, that it's open loop in the US market. Lots of variation. I guess the ECU uses stuff like the O2 and the knock sensor to keep abreast of what's happening with the engine while in lean burn so it can adjust other parameters to protect against engine damage?