1996 Ranger 2.3L problems
My dad has a bone stock 1996 ford ranger 2.3L, auto, 2wd. It developed an oil leak so he carried it to a ford service tech to have it fixed. The truck ran perfectly before he carried it in for the oil leak repair. The tech replaced the crank seal, oil pressure sending unit and valve cover gasket because he found leaks from all three areas. While he had it torn down, recommended to my dad that it would be a good time to change the timing belt. It had been about 40K miles since it was changed so my dad gave the okay on replacing it. Well, when this was being done, he found another leak from the water pump so that was replaced too.
My dad got the truck back from the repairs a few weeks ago, and ever since he's had it, it has had an off idle hesitation. When you mash the gas quickly, it bogs for a second and then picks up. Bascially it does it any time when more than 1/4 of throttle is applied from a stop. The truck also had a rough idle.
The first thing I checked were the vacuum hoses for leaks/cracks. I didn't see any problems, feel/hear any leaks. The next thing I was told was to remove the spout from the firewall and check the engine timing. From internet research, this was supposed to be 10*. My light showed 18*. So my dad carried it back to the mechanic and got him to check the alignment of the gears. All of the dots lined up. So, he put it back together and dad borught it back home. Next I replaced the fuel fillter thinking there could a a slight blockage that the fuel pump was having to overcome at low engine speed. This didn't fix the problem either. Then, I took the throttle body off, cleaned all of the soot off the blades and in the bore, and cleaned the IAC valve with some electical parts cleaner and reassembled it. This helped with the rough idle problem, but the hesitation off idle is still there. As a last resort, dad put some of the fuel system treatment in it and has run 2 tanks of gas through it since then. The problem is still there.
I know its something the service tech did because it ran perfect before. Just figuring out what was damaged/installed incorectly is my problem. The only other thing I can think of is a camshaft or crankshaft position sensor. Does this engine have either of these?
Last edited by clemsonranger; 03-05-2009 at 06:36 PM.