Looking at the 1991 Ford Ranger - 4.0 L V6 - engine wiring schematic in my Chilton repair manual , it shows ( ONE ) heated exhaust gas oxygen sensor
If it's like a 1991 Ford Explorer ( with the 4.0 liter V6 engine ) It has ( 1 ) oxygen sensor
no
In a 1991 Ford Ranger : The heads on the 2.9 , 3.0 and 4.0 liter V6 engines are cast iron
145hp
According to the engine wiring schematic in my Chilton book : For a 1999 Ford Ranger , 4.0 liter EFI , V6 engine : ( there are 3 oxygen sensors )
timing chain
There are three, two just below the manifolds and one after the catalytic.
If you mean ignition timing it will be 10 degrees BTC.
the o2 sensor is located on the exaust manifold
I was looking in my Chilton book at the engine wiring schematic for a 1993 Ford Ranger 2.3 liter 4 cylinder and I only see ( 1 ) heated oxygen sensor
Yes , a 1991 Ford Ranger has engines that are fuel injected
There is no 2.8 Liter in a 1989 Ford Ranger. The Ranger V6is a 2.9 Liter and the distributor rotates clockwise.