High revving Z

[RossT]

Hi all,

My 280Z (carburetted) was fine yesterday but today ..... drove to work, she started revving high (approx 4500 rpm). Kept doing this even when warm (so I don't think the automatic choke). When I tried her before from cold she didn't do it while idling, but when I started driving she started doing it again. It's like having cruise control .... with my foot off the accelerator I can do 50kph!

I DON'T HAVE CRUISE CONTROL. Nor do I want it! Any advice??

Will I kill my Z by driving home from work??

[2ManyZs]

I had a similar problem with my 75 but I still had the FI. Not sure if it could be the same thing since you say you have carbs, but it may be. There is a switch or diode (not sure what they call it) in the back of the tach, it controls the idle speed. Mine would not idle down between shifts or when stopping at a light. It would after a while sometimes, I just changed the tach and the problem was cured. I'm not sure if it is replaceable or if it is even in use if you have taken off the Fuel injection. I believe it signaled the ECU, so this may not be your problem.

Only other thing I can think of would be the linkage binding somewhere, or perhaps one of the return springs has broken or is stretched.