During testing of my O2 sensor, I found that the VW Temp II sensor seems to engage the closed loop operation sooner than an aftermarket type, which admittedly ran only a minute or so longer in closed loop. So even thought the O2 sensor must be at operating temperature, it appeared to me that the Temp II sensor in my case was the slower of the two in a cold engine start up. So if you want to experiment put a volt meter on the O2 sensor black lead and time how long the system is in open loop. You might also note the voltages just before the closed loop starts. If the volts are .7 or higher. you might need to adjust the AFM spring or or wiper arm. I believe Darrell's site contains the instructions. The theory being that the rich running engine will be leaned by closed loop operation sooner. Sincerely, Mark Keller 91 Carat |
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