Originally Posted by Mark the barber
My 2000 For Ranger 4cyl manual trans looses acceleration. I changed the plugs and wires. It wouldn't stay on when starting cold. I changed the idle air controller and it starts as it should. However, it is sluggish up hill. It loses acceleration and makes what sounds like a valve knocking when starting up in 1st and second gears.
Also, I changed the exhaust from the cat back and both o2 sensors.
I dont know exactly what the valve knocking is. I would suggest you do a fuel pressure test at the shrader valve. it is a simple test. you can buy a tester at harbor freight for $20 or rent/loan at AZ. yo are looking for around 60 for the test. A clogged fuel filter can cause this issue also. if you dont know the history of the fuel filter you might want to replace that first.
2004 Ext Cab, 4WD, 4.0, Auto, 146k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 3/10/2016)
2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).