12-24-2014, 08:09 PM
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#10 (permalink)
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Base Member
Join Date: Feb 2012
Location: North Carolina
Posts: 152
Drives: '15 370Z Solid Red
Rep Power: 15
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Quote:
Originally Posted by Perfikt
my issue has nothing to do with warming up. every time, regardless of how long it has been running previously, crank sensor plugged in, nothing (see video above). unplug sensor, starts second try. it works like that even for the first start of the day.
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My first guess is that the wire carrying the crank sensor signal is shorted (either a full short or partial short) to another wire going to the engine controller (not shorted to ground or to a voltage source), and the crank signal during cranking is distorting the signal being carried on that other wire. The Z apparently allows starting and running in "limp home" mode without a valid crank position sensor signal present, as evidenced by the conditions you describe. In my theory, if the crank signal is indeed distorting that other signal, the engine controller is too confused to be able to allow any ignition to occur (high possibility of engine/catalytic converter damage). Just my 2 cents.
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