Plain Jane OEM nothing to see here rebuild

[RETed]

Originally Posted by JustJeff

Can someone explain the PRC (Pressure Regulator Control)? I've seen some emissions removal that use it and some that do not use it. I have been trying to keep it.

I understand that it sits inline between the LIM and the dampener on the secondary rail. But what exactly does it do? I've seen in the FSM "shuts vacuum between dynamic chamber and pressure regulator"

Orange one?
I have a brief description here:
http://fc3spro.com/TECH/PROBLEMS/EM/solenoids.htm

It's basically for emissions and starting, although IMO it contributes more toward a flooding headache upon hot-start cranking.
Basically what it does is vent the FPR to atmosphere on cranking (hot only?).
This causes the FPR / fuel rails to run at a slightly elevated pressure ~40psi.
(Otherwise, cold-start cranking pressure is around 36 - 38psi.)
Mazda claims this is to combat vapor lock on hot-start.
It causes more fuel to be injected into the engine upon cranking on hot-start.

I will tend to pull all of that emissions crap on most of my customer's cars.
I've personally done it to my FC, and I've never had a problem cranking - hot or cold - as long as the engine has good compression.


-Ted