I have a 2001 F150 with the 4R70W. When driving around 30-40 mph & I stomp the gas it will not downshift? I just slowly accelerates in whatever gear that im in at low RPM's. What could be the problem? Im not towing anything?

Thx!

 

wow! seems 51 others r as confused as me? haha!

Any educated guesses?

 

Any OBD2 or tranny codes?

 

only at 30-40mph or any speed

 

my expo kinda dose this too! around 40-48mph and the transmisson kind feel like a slight bumb/jerk when i accelerate,but whats wierd is the rpm goes down!then back up!!EX: if im around 2,000rpm and i stomp da gas rpm goes to 1,8XXX then starts to climb> i wish it would downshift without feeling slugish, HELP!

 

I will throw in a guess. Check the TPS.

Darrin

 

tps?

 

Throttle position sensor.

 

Yes, that.

If the TPS is giving bogus info then shifting can get messed up.

Could also be the MLPS, but less likely IMHO.

Darrin

 

ok then i'll guess i'll try the TPS and hope this is the problem if not?
also
whats?
MLPS & IMHO.

 

MLPS = manual lever position sensor. Also acts as the neutral safety switch.

IMHO = in my humble opinion.

 

it didnt help im thinking its something to do with egr? i dont haveany check engine light, and like i said she jerk and hops around 40-50 which is annoying!!! hpfully im change the fluid, but man this **** making me mad!!!

 

5.4T - *ALL* responses in this thread have been directed to the ORIGINAL POSTER. His truck WILL NOT downshift. It sounds like YOUR problem is different. YOUR truck is probably experiencing a low grade misfire. Spark plug time. If it has COP ignition, one or more cops could also be getting weak.