Idle Problems.. new thread for problems

Discussion in 'Fox 5.0 Mustang Tech' started by savegoodautonfg, Jul 31, 2007.

  1. Im thinking more of the cts, I had that problem with my trans am. It tricked the computer into thinkin it was cold when it really was hot. I havent read all the reply's so i dont know exactly where your at.. but i'd pull it out and take a look at it anyways. you could possibly have a short in the wire somewhere or maybe a bad sensor
  5. It is the main EFI body wiring harness. See the digaram for what a typical 5.0 fox Mustang EFI body harness looks like. You will see that it connects to almost everything under the hood.

    Diagram courtesy of Tmoss & Stang&2birds

    See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring

    Ignition switch wiring

    Fuel pump, alternator, ignition & A/C wiring

    Computer, actuator & sensor wiring

    Fuse panel layout

    Vacuum routing

    Attached Files:

  6. Jritcher, can you possibly circle on that diagram where exactly i have to check the wiring at?
  7. Split the harness open in the area of where connectors, 20,21 & 29 join the main harness. The splice for the black/white signal ground should be in that area.
  8. i let it stick today and popped my hood and disconnect TPS and idle went down and i reconnected it and it was'nt sticking after being reconnected.
  9. You have just given more proof of a TFI signal ground problem. Try using a DVM to check the TFI voltages next time it happens.
  10. Dude...i checked in on this thread about a month ago. Jrichker is one patient man helping you out like this. this thread makes me wonder if you even look at the links he gives you. Its all right there...just read the stuff and fix the problem. There's only so many things it could possibly be! Those diagrams are awesome and very detailed....and in COLOR. shouldnt be that hard to follow his instructions and do some testing/diagnosis by yourself.

    You will never learn how to diagnose/fix car problems if you ask someone to hold you hand the whole time.
  11. Have u pulled any codes yet. If you have what are they.Also the MAF the TB and the injectors have to match. That will confuse the computer. What lb injectors are you running.