[Paul Workman]

Originally Posted by zr-1.R1

excuse my ignorance, I am a neophyte.
if I remove the plenum, and the secondary valves, insert the liquid stop screws, pull the bolt, then the car will give me error 61? and I change gas emissions?

First, the ECM must be programmed for operating without the secondaries:

The new calibration will allow zero vacuum = OK (so no code 61)

At idle, only 1 injector is signaled "on". Above idle (>1%), the new calibration signals both injectors on but divides the dwell = 1/2 for each injector to provide the proper fuel.

Emissions might change. The tuning must be precise.

On a 1990, the POWER switch must ALWAYS = FULL POWER (VERY important!) For 1991-95 the ECM is programmed for the secondaries to always be "on".

All of the secondary circuitry may be removed (shown in PINK) and the plenum vacuum connection is plugged.

Note: On a 1990 ZR-1 the #11 "switch differential pressure" is located under the ECM. on 1991-95 the switch is under the plenum.

Note:...Please forgive me, but I don't understand what you mean by "insert the liquid stop screws, pull the bolt" = ???

Does this help?