Erifx

I have a 1987 rx7 sport. I can't figure out what this adjustment screw controls, so I have not move it. Not wanting to mess anything up.

lduley

iTrader: (1)

if your engine runs fine, leave it be

its essentially a fuel/air mixture screw, you turn it one way to lean it out, the other to richen it

satch

iTrader: (1)

It's the variable resistor and is used to fine tune the fuel mixture while idling. Usually, the slot in the screw is closer to the R (rich setting) than the L (lean setting). The screw only turns a bit past the R and L designations so don't force it if you plan on any future adjustments. Adjustment is made w/the initial set coupler jumpered and the engine fully warmed.