I guess I don't understand exactly what ELC does. I thought it just keeps the car level front to back. if you put drop springs on the car and dropped it 1.5" or so, would the ELC still work to keep the car level? or would the air pump try to get the car up higher to it'* stock level? how exactly do the front struts work? I understand the rears are just air shocks, but what is so different about the front struts? I really would like to get rid of some of the wheel gap, but like the whole ELC thing.

The ELC does try to keep the car level front to back. If you replace the springs with lowering ones, it will try to get the car back to it'* preceived stock height. With the fronts, unless you have the CCR, they are just normal shocks with no air adjustment.

but how does the ELC work? I assume there is a sensor that sends the ELC system a voltage signal and that system is looking for a specific voltage range. if the voltage is too high or too low, it adjusts the rear air shocks to get into the desired voltage range that it has been told to be level. I assume this system works like any other electric sensor such as a TPS, CTS, MAF, etc. the voltage is interpreted into a value by a computer, and the correct action is taken based on that reading
now, if you put shorter springs on the car, why would the ELC system think the car is not level? after all level is level at any height. isn't the system just trying to adjust the car to be level front to back? or is there a exact height position the rear shocks are trying to achieve (i.e. 2" from fully extended) instead of a gyro type sensor? anybody know where this sensor(*) is? yes my car has the ride quality switches.

there is a "arm" and a sensor on the passenger rear side A arm....

all you would have to do it adjust the ELC arm and you would be good to go, it has a screw type adjustment

sweet, that was exactly the info I was curious about.

could I put truck spring on bonneville and would this mess up my elc system?
1992 bonneville sse
171,000 new tstat
02 sensor
I love her

not totally sure what you mean by a truck spring

The same springs that trucks use for stabilization.

so you want a 4x4 looking bonneville? the springs have to be the right coil diameter, height, and spring rate to work. other wise they won't fit at all or you will lift your bonneville instead of drop it.

Yeah I want to lift it up with bigger springs for some bigger rims. Any springs off hand that may work for this?