Posted by Paul Howd on September 10, 2012, 9:57 am, in reply to "Toyota Avensis 1.8 1999 - Poor Lambda behavior # "
Message modified by board administrator September 11, 2012, 2:33 pm|
Right, here goes. irrespective of whether the car is eventually repaired, I would like to know what is going on. So here are some traces. I have also attempted to record the emissions at tailpipe but I didnt make such a good job of those (only one pair of hands) Cold Idle.  corresponding emissions CO 0.56% CO2 14.48 HC o2 0.9 NOX 125 Lambda 1.023 A bit later  Corresponding emissions HC 148 CO 0.37 co2 14.48 o2 0.8 NOX 79 Lambda 1.02 This is where it starts to get wierd.  Corresponding emissions HC 308 CO 0.461 co2 14.15 o2 1.08 NOX 73 Lambda 1.024 Later  Emissions HC 424 co 0.47 co2 14.06 o2 1.20 NOX 76 lambda 1.027 And eventually it does this...  HC 424 o2 1.75 co2 13.82 co 0.363 NOX 80 lambda 1.06 The transition from switching to constant is quite sudden but happened just as the scan went to a new page These were all at idle. At speed, once hot, I got this  the red trace corresponds to throttle sensor. I amm affraid that at this point I wasnt so good at taking emissions readings  when you release the throttle it does this.  Short term fuel trim 3.06% Long term trim -0.8% Live data states operation in closed loop! So what is happening here and why??? |
