ZR-1 Net Registry Forums - View Single Post - TPS re-install boo-boo (snappics); HELP???

Schrade · 07-26-2013

No - no tune problem there Franke; I was just checking out why the 'off-idle sag' that you referred to in the other thread.

No one posted why the pot appears (in mine anyway) to be exponential vs. linear through the range of motion. That appears to account for why the slow response to the gas pedal.

Further reading shows that the TPS has to be adjusted by getting a volt reading with ignition on, and rotating the TPS, with upper and lower securing screws slightly loose, then 'rolling it', until spec 'idle' voltage shows on either the Tech 1 (no got), or on scan software (also no got (yet) ).

I can backprobe the TPS 5V reference feed and return sockets to get that done. I can do a vid, but I've never posted vids to Y/T.

Modding the TB butterfly shaft cam pulley, to fix the TPS, response will take some thought here, IF it can be done at all...

07-26-2013	#4
Schrade Join Date: Dec 2012 Location: NC Posts: 1,783	Re: TPS re-install boo-boo (snappics); HELP??? No - no tune problem there Franke; I was just checking out why the 'off-idle sag' that you referred to in the other thread. No one posted why the pot appears (in mine anyway) to be exponential vs. linear through the range of motion. That appears to account for why the slow response to the gas pedal. Further reading shows that the TPS has to be adjusted by getting a volt reading with ignition on, and rotating the TPS, with upper and lower securing screws slightly loose, then 'rolling it', until spec 'idle' voltage shows on either the Tech 1 (no got), or on scan software (also no got (yet) ). I can backprobe the TPS 5V reference feed and return sockets to get that done. I can do a vid, but I've never posted vids to Y/T. Modding the TB butterfly shaft cam pulley, to fix the TPS, response will take some thought here, IF it can be done at all...