Truck stalls

I have a 1999 Ford f350 V10 I start truck and it runs for 20 minutes perfect and then stalls then I restart it and it stumbles and runs rich and no codes any ideas thanks

You've provided us with ZERO info. This is why there have been no replies. This is not the silver bullet forum. Give us some data and tests that you have done, along with history of the problem then maybe you'll get some help.
How do you know it runs rich after start up? What are your fuel trim numbers? How does it run under load? When it stalls does it immediately restart? Can you keep it from stalling with your foot on the gas pedal?

I have a wideband gague that tells me it goes rich the check engine light comes on but cant retrieve codes when it stalls I can restart it and it runs rich I have replaced oxygen sensors coils camshaft sensor new pcm new coolant sensor purge valve and fuel trims are perfect until it shutsdown then runs rich I'm thinking it's a fuel pressure regulator or fuel injecters any help would be appreciated thanks

Why can’t you get codes?? There probably is something in memory. Have you checked fuel pressure? Hold steady key off??

It shows a check engine light but reads no codes tried 3 kinds of scanners, fuel pressure is good replaced fuel pump,it only shows a engine light when running rich, runs perfect for 20 minutes then light appears, when it's cold first start runs perfect then runs really rich and stalls replaced cht sensor purge valve fuel pump coolant sensor replaced maf sensor replaced tps sensor replaced camshaft sensor replaced thermostat cleaned throttle body replaced pcm replaced fuel filter replaced air filter replaced oxygen sensors replaced fuel pump relays I'm thinking leaking fuel injecters or bad fuel regulator it's got a supercharger on it but I have bypassed the supercharger so I no it's not the supercharger it's the craziest thing I've ever ran into and throwing parts at it what do you think

Found out I'm having problems with coolant sensor I'm getting codes po118 po117 replaced with oem Motorcraft sensor all wiring is good and sensor is good but truck keeps throwing these codes and stalling I was told by this site I'm supposed to have 11 volts at coolant sensor but when you do research on it they say it's supposed to have 5 volts to sensor can you clarify and replaced pcm 2 times still shutsdown and throws po118 and po117 thanks

twinscrew9.0.twinscrew9.0 wrote:

Found out I'm having problems with coolant sensor I'm getting codes po118 po117 replaced with oem Motorcraft sensor all wiring is good and sensor is good but truck keeps throwing these codes and stalling I was told by this site I'm supposed to have 11 volts at coolant sensor but when you do research on it they say it's supposed to have 5 volts to sensor can you clarify and replaced pcm 2 times still shutsdown and throws po118 and po117 thanks

As you may already know, disconnecting the sensor should show -40 degrees F, and shorting the 5v reference/ signal wire to the ground wire with a paper clip should show the highest temperature on the scanner. Also, if your truck is equipped with CHT (Cylinder Head Temperature), check it as it can set these codes as well according to ALLDATA.
Service info from Alldata suggests that you disconnect the sensor and simulate 1.0v on the sensor circuit. The simulated 1.0v signal and scan PID voltage should be similar. If the voltage is not similar, check the related circuit and PCM. Let us know your fidings

So am I supposed to have 11 volts at coolant sensor or 5 volts I'm getting 11 volts thanks

According to AllData, you should have 5V.
Try disconnecting the PCM and see if you still have the 11V. What does the scanner show as temperature with key on, connected and disconnected?

According to you in a older post I am supposed to have 11 volts at coolant sensor because it's a gague driver and all the ford forums say you're supposed to have 11 volts

So I'm confused on which it's supposed to be

I will check ProDemand today.