TwinTurbo.NET: Nissan 300ZX forum - Yes - dying injectors can fail and then work,
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Subject Yes - dying injectors can fail and then work,
     
Posted by jzack on May 24, 2008 at 5:54 PM
  This message has been viewed 166 times.
     
In Reply To Possible PTU issue..random cylinder dropping posted by Mike87T on May 24, 2008 at 04:35 PM
     
Message back and forth for a bit. One of mine did that for 3 cycles over about 2 months before finally failing.

People sometimes have issues with the PTU sub-harness - the short harness that was used to adapt the newer style PTUs to the engine harness connector. Some folks elect to eliminate parts of that sub-harness and solder one end right to the main harness connection. You need the other end of that sub-harness to plug in to the PTU.

Try jiggling the sub-harness when the car is idling and see if anything changes (just be careful of the fan blade)...

     
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