Post by
Ace2cool »
https://forums.nicoclub.com/ace2cool-u95120.html
Fri Apr 22, 2011 3:36 pm
Could be the CAS or the PTU. They're the two things mounted on the exhaust cam intake covers on both sides. Since you have a 91, I would look to see if you have the old style PTU or the new style. There was a recall done on these due to a high failure rate of the old style.