1994 F-150.

Upon shifting at 2000 or so rpm, when the clutch is depressed, the engine revs up 400 rpm or so (for the last week).

If 20 secs or so passes, the rpm will begin to fall.

Also should be noted the engine is idling at about 1100 rpm for the last week.

used to idle around 800 rpm.

I am in PA and the Temperature is cold, but this problem did not occur last year.

thanks for you help!!

 

i sugest you get a scan on your computer
sounds like it is in fem mode first thing it does is
kick up idle
could bo as simple as needind a new thermostate
to bring up engine to operating temp

mitch

 

thanks.. what would new thermostat do for that?

what is fem mode?

anything to check out before I take it to the shop?

 

FEM FAILURE EFFECTS OR LIMP MODE
ENGINE RUNNING TO COLD WILL SET ECT CODE AND
TELL ENGINE TO RUN FASTER TO WARM UP
MITCH

 

Check your IAC valve.

If the PCM is in FFEM (Field Failure Effects Mode), the CEL will be on.

Run all the PCM Quick Test including the KOER portion and see what happens. Only extra tool you need is a paper clip.

Steve

 

a second vote for checking the iac.

just had mine replaced.

while driving i would feel the truck pulling itself down the road, i would push in the clutch to find the motor idling at over 2000 rpm's.

same thing when coming to a red light, and engaging the clutch to go into neutral. rpms would again be over 2000.

my problems actually seemed to be worse when the motor was hot, but was the same symptom as yours.