Ok, I thought that with bare-block you only had to run a Pressure Reg. Line, a Pressure Sensor Line, and Oil Injector Line.... well... not the case.

The Pressure Reg Line, goes to a solinoid... where do the 2 Vac lines from the solinoid go???

 

One from the manifold and the other goes to the pressure regulator. You need not the solenoid. It only blocks vacuum during hot starts. Its open and pulling a vacuum 99.9 percent of the time. You don't need it. Just plumb the vac line from the pressure regulator on the back of the secondary fuel rail to manifold pressure.

 

I second Hailers - there is NO driveability or starting problem swith the solenoid removed.

BTW, I'm assuming you're talking about the solenoid for the fuel pressure regulator, right?


Dale

 

Umm, im not 100 precent sure, but close enough, i think you haev it backwards, It only pulls a vac .01% of the time, when that happens it lowers the fuel pressure, the rest of the time, while not pulling any vac it at normal pressure, you were right though, its fine to cap off

 

No, its connected to manifold pressure virtually all the time. When its in that configuration the fpr *sees* the rise and fall in manifold pressure. If there is a large vacuum as at idle, the fpr will set the fuel rail pressure at approx 28psi(depends on the condition of the engine to some extent). When the solenoid is engaged, it cuts off the manifold pressure to the fpr, and the fpr sees atmospheric pressure, and the fpr will go to approx 38-40psi. That only happens during hot starting conditions. That has to be is the .001 precent range. Hardly ever.

I don't see why you'd want higher pressure during a hot start. Seems thats a formula for flooding. But I must be wrong, because it was designed like that.

Maybe I worded the first thread a little awkward. Bottom line the fpr sees manifold pressure 99.1 percent of the time.

 

Hailers, heres something for you to think about. Since I removed my PRC solenoid, my car simply will not flood. Nothing I can do will flood my car. I can turn it off before it warms up, and it starts perfectly fine. My car also starts right up when hot.

Could the PRC be the cause of the flooding problems with FC's?

 

mazdaspeed7.....seems that way. Question: where is the hose from the fpr going to right now?

 

First, I have removed ALL of the emissions crap. Second, I took the intake manifold off, and removed every vacuum nipple except 3. The ones I removed got the holes filled in with JB weld. The 3 remaining ones are for FPR, pressure sensor, and oil filler neck vent.

That does wonders for tracing vacuum problems. And my car runs better that it ever did with the emissions stuff. I dont have cats either, and my car doesnt smell at all. Ive seen many FC's with cats that smelled worse than my car.