| I just wanted to share this in case anyone was to run into the same problem. My daughters 94' Z was having a problem where once the motor got hot it would run REAL rough. When this occured it was almost impossible to get the car started after shutting it off. From dead cold it would start ok. The car had been having a high idle problem even when you adjusted the idle adjustment screw all the way in so I decided I would start at servicing the IAA and AAC using the info at this link. [ http://home.swipnet.se/e-solutions/IdleTech.html ] There are three connectors involved in this and all three were heavyly corroded. After thoroughly cleaning all the connections and completing the rebuild on these items the idle adjustment worked flawlessly but after the motor got hot it was right back to the REAL rough problem again. The engine ran and sounded as if either the timing was out or one or more injectors were cutting out. A timing light revealed the timing was ok when cold but became very erratic when the engine got hot. To rule out if one or more injectors stopped operating I used my engine stethoscope to listen to each of the injectors and I could hear all them clicking away just fine (a quick way to tell if they are operating but not a way to tell if they are spraying properly). To make sure the PTU wasn't failing when it got hot I swapped in a known good PTU but the problem was still there. I had already pulled the connector to the CAS and checked it for corrosion but it was very clean. Not able to see the inside of the connector on the CAS I removed the CAS to inspect it and my first impulse was to spin the shaft and WALA! The shaft did not spin freely at all. It had a very grindy feeling. Luckyly I had a good CAS lying around, installed it, adjusted the timing and idle and all was fine. From how bad the CAS shaft rotation was I was supprised it even worked at all. Hope this info helps!
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