Malcom: I beg to differ. I have a dash mounted LED (O2 sensor) monitor. I have NEVER seen the system go into open loop once it reaches operating temperature. In fact the higher the RPMs the faster the lean/rich cycles occur. >From the outer banks of North Carolina to the Smokies. Ken Lewis 86 VW Transporter Three Door Pickup
On Fri, 6 Jun 1997 02:32:51 -0500 mholser@Adobe.COM (Malcolm Holser) writes: >since the O2 sensor is usually not in use when driving up high (^; >You see, the system goes into an open-loop mode. bypassing the sensor >at something like 3000 rpm and above. Then engines make so little power >at altitude that you usually downshift and keep the rev's high. The >airflow meter, which kinda measures air mass, kinda compensates. I understand >the hot-wire versions do a better job. > >In closed-loop operation (normal driving) the O2 sensor will do a good >job of controlling for optimum burn, including compensating for altitude. > >malcolm >
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