my 93 bronc 351 e4od runs and drives great but a few months ago i noticed that between 30 to 40 mph it sort of hesitates like it doesn't know whether to shift or not does anyone know what this might be? what things should i check first? help please!

 

I can't tell from your post whether it seems to be engine or a transmission issue. To start with, the basics -

Check transmission fluid level.

Make sure that the engine is in proper tune.

Fuel filter may need to be replaced.

Start with the easy stuff first before you go throwing money at it. You could also check for any computer codes that may shed some light on the problem.

 

i'm not really sure if its engine or tranny. tranny fluid is good engine idle is fine. all other speed ranges above and below are fine its just when you cruise along in that speed range and go to speed up, it king of coughs and very quickly races to appropriete rpms and goes.

 

My 89 did the same thing but I can't guarantee what fixed mine will fix your. It was my fuel pressure regulator. Of course, it could be plugs, wires, coil, distributor cap and rotor or many other things. Ford even has a TSB for plug wires #7 & #8. They cause poor flow if they are crossing each other.

Good luck and let us know what happens.

 

Another suggestion would be the O2 sensor. Mine surged around 25-35 mph when running around town pretty much like you described. Replaced the O2 sensor and it went away. But I'd try the other ideas first.

 

E4OD drops into overdrive between 35 and 40 MPH under normal driving conditions. Low fluid or fluid that has lost viscosity or even a clogged filter could be the culprit. The engine situation can be checked by pulling codes. Anything that feels like a misfire or stall should trigger computer codes if it has to do with the engine and performance.

 

i have a '88 150, and it kicks and stuff too, right around 35, but its got 141000 miles on it, im pretty sure it is the trans slipping, its worn right out, mostly only under load is when its worst