| I have the same issue, but I also have a data tap into the Consult port and am able to monitor lots of information as this is happening. Also reference a much older post here. Bottom line is at part throttle, between coolant temp of 70-130 degrees, there is a massive timing pull (down to 15 degrees) and heavy hesitation. The Consult port reported water temp rises smoothly and there appears to be no issue with the water temp sensor. Unless that temperature displayed through the Consult port is being read from a different sensor. AFM voltage, TPS voltage, injector duty cycle all appear normal and don't jump around. I can hold part throttle when the temp is at about 128 and get massive hesitation with timing showing 15 degrees. Then, with no change in throttle position (as the car is accelerating slowly), as the temperature passes 130 it's as if a switch is thrown and the timing picks back up to ~40 degrees or so (depends on exact throttle position and RPM) and the hesitation is gone. None of the other readings (AFM/TPS/Injector duty cycle/battery voltage/etc...) change. I e-mailed the original (old) poster and got this response:
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"Jason,
Diagnostically there are no clues. I talked to a few seasoned Nissan mechanics about the problem. One of the isues was a variation in the resistance of the injector circuits. An older mechanic referred to these events as "soft" fails. His experience was the injectors failing. He had no specific direction to point me in other than to wait until for a complete fail. Ultimately mine car did. Thus far it appears to be related to two injectors burning out."
----------------------------------------------------------- My IACV is new, I have a new EFI harness installed, and all my injectors ohm out correctly, but they all have ~145k on them. My next test is to replace the injectors one at a time with new ones and see if I can isolate the "soft fails" to one injector, then strip that one down to see what the issue is. FYI 91ttzx, 130 degrees corresponds to where your stock temp gauge just barely starts moving up. If anyone has any more info, or if you have successfully killed this Z demon in the past, please post your data. Cheers,
Jason
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07:39:50 02/23/10
