Hydroboost - stalls with brakes pressed and full lock.

[Papikev252]

I recently replaced the fuel injectorss with Bosch on my 99 K3500 7.4L and it finally got rid of my multiple misfire code. Engine idles and runs smooth as ever. After it reaches operating temps, it still runs good but earlier today when I was backing into my parking spot, it stalled. I know the hydroboost and full lock with the PS put a huge load on the engine but what would cause this? Fuel pressure is within spec, there are no obvious leaks on the master cylinder or lines itself, PS is topped off, although I do notice sometimes I can hear it squeal once in a blue moon.

 

[Schurkey]

Connect a scan tool, verify idle speed, and IAC operation.

MAYBE the PS pump pressure relief valve is stuck, causing extreme pressure and therefore extreme load on the engine--needs more power than the engine can provide at idle, so the engine stalls. Unlikely, but possible.