Hi Chris, The vacuum system that controls the secondary port system on my car has developed a leak somewhere under the plenum. The breather box gasket and or breather hoses leak a good bit. The cost of the parts for these two issues are not significant, the labor to get to them is. Not that R & R on the plenum is any more complicated than an intake manifold swap on an old s/b chevy. To me the question is what else is under there that is a wear item affected by either number of duty cycles and or time in service. That answer I compare to the fact that every time one of those parts needs replacing you have to R & R the plenum. If you have a work space, which I don't, the Q is not relavent because you can just correct each problem as it comes up.
The clutch hyd system needed to be replaced because it sat more than it was used and developed leaks. I'm sure that system's problems were a combination of duty cycles and time in service and me wanting to actually use the car. There were some other issues like the speakers and CD player that were N/G when I got the car. Again, I felt if you use it alot you would be inclined to fix those minor issues because they would bug me as a driver. The owner never brought it back for the PROM update, again I feel because he didn't use it enough for it to bother him. Heck he just had the seat belt recall done about a yr before he sold it!
Maybe I'm wrong about all this but you know when something's wrong with your toys it bugs me & makes me want to fix it. Oh, it also still had the OEM rubber on it, 15 yr old tires! Don't get me wrong, I'm not sorry I bought a ZR-1! I just think had I thought about it a little more I might have saved some $ on the price and bought one with more miles and more fix'in done to it. Hind sight is always 20/20!
JMHO,
Tom
