TFI Module Testing?

Discussion in '94-95 5.0 - Specific' started by PRO5OHHO, Mar 18, 2014.

  1. PRO5OHHO

    PRO5OHHO New Member

    Messages:
    23
    Likes Received:
    0
    Joined:
    Mar 25, 2008
    Location:
    Houston, TX
    I've found a ton of diagrams on the internet for testing the fox body (distributor mounted) TFI modules but none for our year cars. The foxes have pins on the side & @ the main connector for testing resistance but ours don't. They only have pins @ the connector. Anyone run across a diagram like that? I've got a crank/no start condition on the car (just died while coasting, and hasn't started back up after days of sitting), I have fuel & spark, and the rotor spins, so that leaves:

    a) TFI module
    b) Pickup coil
    c) ignition module
    d) engine ground
    e) loose wire in the connector underneath the coil
    f) PCM
    g) ICRM

    I figured the TFI & the engine grounds would be the easiest to check first.
     
  2. toyman

    toyman Active Member

    Messages:
    874
    Likes Received:
    9
    Joined:
    Aug 25, 2008
    If I were to guess the most likely cause is the PIP (Hall Effect Sensor) in the distributor. As a caution, reman dizzy's are prone to PIP failures. Your best bet is an all new Richporter dizzy for about $100.
     
  3. 2slo95fiveoh

    2slo95fiveoh Well-Known Member

    Messages:
    2,559
    Likes Received:
    3
    Joined:
    Dec 31, 2006
    Location:
    Lawrence, Kansas
    I could be mistaken, but I thought I had seen a few people say they had their TFI module tested at Autozone?
    This could be something made up in my head, so take it with a grain of salt, but I could have sworn I've heard others saying that.
    The PIP has a very large failure rate, so I would put that at the top of the list for possible causes too.
     
  4. CC'S95GT

    CC'S95GT Legend

    Messages:
    10,738
    Likes Received:
    172
    Joined:
    Apr 19, 2008
    Location:
    Hampton ,Ga.
    You can test the pip just by turning the rotor.
    Mark the rotor then pull the dizzy out enough to freespin the rotor. Turn the ignition on /engine off, then after initial 3 second time out of the fuel pump spin the rotor on the dizzy. If you hear the FP come back on then the pip is working.
    The problem with the PIP is the failure is heat related in the begining and gets worse over time. So the test might not be accurate when the engine is cold.
    Restab the dizzy with the rotor pointing to the mark you made in the begining.
     
  5. PRO5OHHO

    PRO5OHHO New Member

    Messages:
    23
    Likes Received:
    0
    Joined:
    Mar 25, 2008
    Location:
    Houston, TX
    alright thanks. next time i'll just take the TFI to autozone and try to find the most competent person there and see if they can test it.