Quote:
Originally Posted by Discseven
Gilles... Way I set dual wideband up here is to see & record O2 data using LogWorks. No controller is connected to ECU so engine is now constantly open loop in regard to O2. Early on in this expedition---in the "which way to turn..." thread that I recall you were a part of---there was input that a 3.2 does not need the closed loop provided by a connected O2 sensor for the engine to run correctly. I checked this proposal by disconnecting my O2 sensor and running a mileage test. No difference in mpg or performance with or without the O2 sensor connected. Given my 10 mpg city, perhaps this discounts the credibility of my engine's results in this regard. That said, given the credentials of those who offered this input, I doubted only because I'm an empirical monger.
I did swap the O2 sensors side-to-side in the exhaust after seeing the first trace lines... (green is 1-2-3 side / blue is 4-5-6, scale is lambda.)
Had to question if imbalance seen was a sensor or controller fault or truly the exhaust O2 levels. I also swapped the Innovate controllers. Readings did not change for each side of the engine. I concluded hardware was working correctly.
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Karl, one more thought after seeing this chart. The lean side has some spikes in it as well as being higher. Could this be a leak somewhere on the intake side? A crack, gasket, hose, or something else?
I may be overlooking this answer, but could the DME be reading the lean side to over correct fuel dose and driving down the mpg? You probably wouldn't feel this in the power of the engine, but it would definitely show up in fuel use.