Few issues with my Z

[Paul Workman]

Care of Marc Haibeck:



I believe if it is hunting like that, then one can assume the IAC is working; as the name implies, Idle Air Control: wouldn't "hunt" if it wasn't actively varying idle air flow - a scanner would be ever so handy here.

However, the Throttle Position Sensor comes to mind. As it happens, just a few days ago I had removed the TPS connector temporarily as part of another project, and forgot to reconnect it before I fired it up. Same symptoms you describe - I think? When I fired it, the idle speed took off, settling at closer to 2100 rpm and it began to hunt a little. So, you admit your TPS is "bad", then that would be the place to start eliminating troubles, methinks.

[efnfast]

I suspect the car in the picture is the car he wished he'd picked up 5 years ago.
I think I like the side pipes.

[Schrade]

If you got a TPS CIRCUIT DTC, then maybe before buying a new TPS, plug in a multimeter with backprobes (paper clips) in the TPS harness connector, to test voltage.



Then if range of voltage with IGnition ON, motor off, is not correct, check resistance of the TPS itself.

BASELINE:



Range of motion pegged

[XfireZ51]

Originally Posted by XfireZ51

Sorry but doesn't your ZR have the wrong rear end cap on it?

Tried deleting this after I realized it was pic of the 383 BigIke was describing.