I'm having an intermittent rich running problem with my 90 2.1 liter Westy. This was the same symptom that I had that was fixed 13 mos. ago with a new temp II sensor. This has been replaced with no effect. One other interesting thing that I noticed when attempting to install a wire to feed an oxygen sensor monitor was that just connecting an additional wire to the sensor causes an immediate rich running condition. I had a problem this morning when the engine was started cold with running rich also. Am I looking at a problem involving cleaning up some grounds again. I'm thinking that I may also need to test the voltage coming from the sensor and also at the ECU. Any ideas towards diagnosing this problem would be greatly appreciated.
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