Bigblueone,
What did your mechanic to set the lower chamber pressure to .4 below primary pressure?

To the group,
I've been fooling around with an 89 300CE and have made some interesting observations. The o2 sensor output was about .8 volts at idle and went to about .1 at about 2000 rpms. I installed a used EHA and the o2 output liked to stay at about .8 idle and high speed. I hooked up the gas analyzer and it was < than 1 percent at idle and 2.5 at cruise. I installed another used EHA and o2 readings were the same, but cruise CO went to < than one percent. I don't know yet what all this means, but maybe the EHAs get unreliable with age and maybe someone has messed with the screw in back. I'll fool with this as I get more time and post back.

Peter

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