PFS Purple ECU and A/C
 

I have a PFS Purple ECU on a 94' FD. A/C worked PERFECTLY when i first bought the car, it wasnt until the MOMENT i installed the PFC that it f'd up my AC.

It has been like this for months...i just dont use the a/c much but now its hotter than godzilla shit and i want my a/c

this is the deal -

- turn a/c on, car's idle does not raise, idles for about 30 seconds then the idle starts boucing, bouncing, BOUNCING, BOUNCING!!, until its bouncing like 1k rpms up and down and then it stalls....

-if im driving in gear a/c works great..only the car can't idle with it on..

-now if i hold the gas down a little to keep the idle around 1200rpms no bouncing nothing!

I know for a fact if i unplug and run the stock ECU it will run fine...so any ideas?

Check the PFC forum:
https://www.rx7club.com/power-fc-forum-47/power-fc-c-fix-435420/

ive seen that thread man, but i have a PFS Peter Ferrel Piggy Back...im afraid to do the mod

my car's a/c works fine the car just doesnt idle...people with the pfc have the a/c not engage at all

So which are you using: the Power FC or the PFS piggyback?

Ok, so I'm assuming the "PFC" in your message was a typo.

I've never heard of anyone having A/C problems with the Purple Motor Eater. Are you sure you don't have a grounding issue?

WHOOPS typo

yes definately the purple motor eater...although its not eating my motor

maybe its due to the fact that I dont have an airpump? my grounding is great (ground kit)

Why not just switch to something easier like a M2 ECU?

Well, removing the airpump with a stock based ECU will cause the idle to get a little lumpy (and it will be worse with electrical load). Try increasing the idle RPM to around 1100 rpms and see how the car does.

Does the idle improve with an electrical load? I know that on occasion, for no reason whatsoever, my idle will 'hunt' up and down a bit, but simply turning on the parking lights smooths it right out.

Due to the mapping of the ecu, the parking lights make it idle a little higher and probably takes it out of the hunting rpm range it was in. Not 100% sure but I think it was 750, then 850 and then 950 for idle rpm based on what was on, nothing, electrical load, and A/C.

hunts sometimes...mainly occurs when i try to adjust the idle up...anytime i move the idle screw ontop of the throttlebody to raise the idle, the car will raise it for about 2 seconds then bounce between the previous and the new setting until it stalls (same thing when a/c comes on) so therefore i cannot adjust my idle i have to move it back down

Are you sure the PFS unit works properly? i.e. have you tested it on another car?

i know the person i bought it from and he had the same a/c issue but his car ran great...the only other issue is it seems to run way to rich on setting 2 for 12lbs...at 12lbs on setting 2 the car stutters up high so i have to run 12lbs on setting 1