OK I think I have how it works here now,,use the reply got it.I've replaced the throttle position sensor,the fuel pump,the map sensor.I've done the fuel pressure check at the shrader valve,I've done what's called the deadhead check at the throttle body and still no pressure reading.I'm thinking if the throttle body fuel return is blocked and still no pressure maybe the pressure regulator is bad or the whole throttle body assembly.where mite I purchase a manual for this auto
If you had no fuel pressure the engine would not run or would stall even with your foot on the accelerator. This is idle related. Probably a simple adjustment, but I can't even remember the last time I saw an HT4100, so I can't tell you how to do it from memory. I think Carnut is still pretty current on this engine. See what he has to say when he stops by.
I forgot to mention she idles rough then quits,plugs where good,but I replaced them and wires,cap was not cracked or scored,rotor button was good.compression reading at the cylinders read between 139 and 149 psi .I was told that ,that is good across all 8 cylinders
Cap looked nearly new same for the button neither had no scoring.checked all the segments of the computer display,had trouble codes and replaced the codes that showed...think they were code 71. 52. And 27.. only one that showed was 52 meaning the power was lost to the ecm..
This engine is a throttle body 2 injector fuel system. On the driver side of the throttle body is an ISC (idle speed control) If thats retracted or has no power to it, the idle will be too low and the engine will stall. The TPS if misadjusted, will cause alot of running issues. It's not as simple as replacement only. It must be adjusted to .5 volts at base idle, did you do that? A faulty oil sender or connection to it will prevent the engine from starting. I think you're in over your head and more so without the factory manual. And again, please list the year and type of car in your profile signature, just click on your forum name and then click on view profile to edit it. The ISC is also adjustable and without the FSM you will have no point of reference! Attempting to adjust the ISC without the manual can possibly damage that circuit in the computer!
Like Ranger said the oil pressure switch won't make the car stall like that. Did you pull codes to see what's going on? I forget what ignition setup those have but a bad HEI can cause problems like that, so can a bad pickup in the distributor.