I want to up my idle when my AC is on by around 250-500rpm's. I know that some jeeps (police, government ones) had this option so does anyone know what mods to the CPU have to be made?...Tj

 

Anyone know this modd? or do I have to experiment a bit..lol...Tj

 

You're probably thinking of the "Extended Idle" switch - which set the idle up around 1000rpm by pressing a switch on the dashboard (mainly to provide additional alternator output, to drive lights/radio/&c on police models.)

I believe it's wired into pretty much any OBD-II PCM - the problem is that your 1994 is OBD-I. You'll find the mod covered in fair detail on NAXJA.

As far as a full DIY version, you may have trouble. You'll need to either have access to the stepper motor that controls the idle (the IAC - which already opens up slightly to keep the idle up with aircon load on,) possibly find a way to fool the PCM into thinking the aircon is on when it isn't (I haven't looked into this,) or use a friction-lock control cable to make a bypass hand throttle (these can be had at most industrial equipment supply houses - I used to put them on forklifts often to give better hydraulic performance at idle.)

 

Thanks for the reply, I'll have to do some research on this. I will write back on my findings, if any at all...Tj