I thought I remembered reading a post that said the ECM needs to know if the vehicle is in gear or in P/N. I have just swapped out my manual transmission in my 88 vette for an auto and switched to 7730 ECM. Do I need to wire up the P/N safety switch in my shifter to the ECM or not. If so, does the P/N safety switch from the ECM go to ground when in Park or Neutral or ground when in gear or neither?

 

The park/neutral switch wire, (orange and black I think, goes to BD16) should be grounded when in park or neutral. In the manual transmission PROM the setting for park/neutral idle adders is set to zero. I've ran a TPI retro-fit w/700r4 since '94 and it's never been hooked up to my switch. Never made any difference.

The only thing is, (on a 730 ECM at least) without this wire hooked up you will never get over 800 RPM idle request from the ECM when the engines cold.

 

Thanks for the input, that is what I needed to know.