|
>>With the screw - is right/in lean or rich? is left/out lean or rich?
Neither - this is an air bypass screw, it just lets air past the throttle body. The DME will set the mixture accordingly.
Moving this screw simply adjusts the 'base idle'; from there the IAC (Idle Air Controller the cylinder shaped thing near this screw) will modulate additional air to stabilize the idle, and raise it during cold starts.
Turning the screw out allows more air past the throttle blade. If it's turned out too far, the IAC can't lower the idle enough to get to 800 RPM. If it's in too far, the IAC cant raise the idle high enough during cold starts.
HTH,
Chuck.H
'89 TurboLookTarga, 348k miles
|