I took advice from the guy at pepboys and bought a decoder and a haynes service manual for a 95 f150 4x4 5.0. The great thing is that the decoder actually tells you codes of whats wrong. Unfortunately i had to settle for the base model (the one with the flashing red light) instead of a digital screen. I tried getting a digital one but my truck just misses it by 1 year . It does up to 96 well i have a 95 so either spend 300 bux on a digital one or spend thirty and count beeps. So i counted the beeps and it looks like i have a code #12 . when i look up 12 in my code book, it says "system cannot raise engine speed above normal idle". What the heck does that mean? I spent a few hours lookin thru my hayes manual but that thing is almost as good as a childrens book, hardly has anything i could use in it the index is terriable. Will someone please help me get the answers to my problem, your knowledge will be greatly appreciated.

 

FWIW, if you bought the beeper/flasher, you wasted $30. A paperclip can do the same thing.

Your ISC/IAC valve is probably sticking/weak with a DTC of 12.

Clean or replace it (if cleaning doesn't help). Reset the computer by removing power after service to force the computer to relearn idle speed control parameters.

Steve

 

Here's more info on the paperclip (jumper wire) trick.