Few issues with my Z - Page 2 - ZR-1 Net Registry Forums

Paul Workman · 09-01-2014

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 · 09-01-2014

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 · 09-01-2014

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 · 09-01-2014

Quote:

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.

09-01-2014	#11
Paul Workman Join Date: Nov 2007 Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri Posts: 6,493	Re: Few issues with my Z 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. __________________ Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 09-01-2014 at 08:48 AM.

09-01-2014	#12
efnfast Join Date: Nov 2011 Location: Dunbarton NH Posts: 7,486	Re: Few issues with my Z 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.

09-01-2014	#13
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: Few issues with my Z 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 __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]