90 with MiataLINK ecu -

I've lost control of my idle - only able to raise it from the current base which used to show 880rpm. The IAC/ISC value started falling to 15 and stays there regardless of the position on the throttle body screw. Used to settle around 30-33. My idle now runs 1200-1400rpm. Neutral switch is working.

When the IAC is unplugged the revs shoot up to 2k from 1200-1400. Valve shows 13ohms from terminal to terminal. Power wire is 13.5v at idle. Control wire shows 11.75v at idle - no change rotating the TB screw. That seems suspect...? Thoughts?

 

Seems to me like a cooked AIC are you adjusting it with ten gnd jumpered?

 

I don't know if it will fit on your FE or not, but I think I have a spare IAC in one of my parts boxes...

 

Figured I'd check before swapping it out. It's not acting fried in the sense that the idle rises when it's unplugged... then maybe it's sticking? or lacks full movement? The jumper ten/gnd doesn't apply with the Link.

I've got a spare one. My manifold is actually a 1.6 top half welded up to a sportage bottom half- so the 1.6 throttle body still applies. Figures this happens just before the emissions test which has an idle limit of 1250.

 

stoopid vacuum leak - big hose not connected to the back of the mani