Ford Ranger Engine

I Have A 2001 Ranger 4.0 Liter 4 Wheel Drive 67k Miles. I Have A Knock/ping On Accelleration Or When I Put It Under A Strain, Like Going Up...

I Have A 1992 Ford Ranger With A 2.3 4cyl. The Temp Guage Will No Go Into The Normal Range And It Blows Only Warm Heat Not Hot. I Have...