My 1990 5.0 coolant temperature is in the O&R range of the n-o-r-m-a-l gauge .
I've replaced the radiator, thermostat, water pump and engine coolant temp sensor. No improvement. When I had the waterside open, there was no sign of corrosion, crud, silt, etc.
AT THE SAME TIME, my oil pressure is normal when the engine is cold and warming up, then drops to almost nothing when at a low rpm. The pressure does pick up when the engine rpm increases. (My son hopped a curb and scrubbed the oil pan, so I'm thinking he bent the pickup tube).
Can these two problems be related or just coincendance?