(i have a 94 gsr)
what does the secondary butterfly (IAB) in GSR really does?
wich one is the wire i need to hook into the computer (from where in the intake is it connected)?

 

for the 4901580158th time:

secondaries


A20 i believe is the IAB pinout

 

awesome!!!!
one more question
this guy is telling me that since this my engine is a 94 model there is no connection to the ecu? (the ecu is a obd2 gsr p72)
is the obd1 gsr engine intake second butterfly actuated in a different way???
is he bs'ing me?
thank for the info!!!!

 

An OBD-1 engine with an OBD-1 ECU is the same. The ECU triggers the IAB. You've got an OBD-2 ECU in a '94?? I suppose it's a different pin on the ECU. So maybe he found that it's wired up wrong? Or maybe that guy just doesn't know...

IAB is pin A17 for '95, I don't know which pin for OBD-2.

 

Why would you want to disconect it?

 

a couple of guy have told me that it is vaccuum actuatedd

 

it is

 

The ECU uses a solenoid valve to apply the vacuum to open & close the secondaries. So... yes & no.

 

actually, when it there is no vacuum it opens the secondaries.