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Posted by 300ZMang on October 14, 2013 at 11:06 AM
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In Reply To 300zx dies after 15 to 20 minutes of driving or idling. posted by PARAZER on October 14, 2013 at 10:57 AM
     
Message Had a problem with an old NA of mine. It started fine and drove seemingly normal until one day it stalled out. It wouldn't fire back up. I sat and waited, let it cool down, then BAM it started up.
Come to find out I had a code for passenger o2 sensor (but it wasn't throwing a CEL).
Once the sensor got very hot, it would prevent the car from running or starting, but when the sensor was cool/cold it would start and run fine.
You didn't mention running codes, so do that first.
Also run the heated o2 sensor test if you can get your Z to operating temp and have it running before it stalls.
Also, change your engine temp sensor - $20 and easy to replace.
Maybe your "spark diagnosis" is related, maybe it's not.

     
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