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Subject Re: 94 300zx Unstable Idle at 750 and 2000 RPM
     
Posted by svwilbur on January 19, 2013 at 10:31 PM
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In Reply To 94 300zx Unstable Idle at 750 and 2000 RPM posted by svwilbur on January 19, 2013 at 07:24 PM
     
Message also one other thing I noticed. The drop in idle with the TPS connected occurs at the same time that the driver side Heated O2 sensor goes OFF during a O2 sensor test on the ECU diagnostic. When the light comes back on the idle goes back up. I think that was the way it went. May have been other way around. But I think it was lit most of the time and off only momentarily when idle went down. This is looking at the Check Engine light or the diag light on the ECU which pulses together in o2 diagnostic mode. This was at idle when the o2 sensors do not do much. Not sure if this is a result or symptom. Guessing it is a result of something else happening like the ECU telling AAC to open or close for some other reason.

     
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