Lx Left Me Stranded Again

Discussion in 'Fox 5.0 Mustang Tech' started by LarsD, Mar 25, 2014.


  1. LarsD

    LarsD Founding Member

    Joined:
    Jul 2, 2002
    Messages:
    2,562
    Likes Received:
    55
    Trophy Points:
    68
    Was on my way to work. Rolled up on a stop light and it died. I couldn't get it restarted. Last time it did this it ended up being the battery (intermittent cell). Not the case this time. Since it would spin over at normal speed, but wouldn't fire. Over the course of the next 15-20 minutes it would start to sputter more and more like it wanted to start until it eventually started. I was able to turn it around and get home. As of right now I am suspecting a fuel delivery problem, since it was acting like it wasn't getting fuel. Not entirely sure though. I stopped to listen if the fuel pump was priming at one point, but right after I did that it fired up. Of note, I pushed the accelerator all the way to the floor while I was trying to start the car, and it didn't sputter at all (this disables the injectors does it not?).
  2. mikestang63

    mikestang63 Mustang Master

    Joined:
    Aug 28, 2012
    Messages:
    3,409
    Likes Received:
    885
    Trophy Points:
    144
    run the codes but I suspect the dreaded TFI but the dust.
  3. Gearbanger 101

    Gearbanger 101 we love us some gays up here Super Mod

    Joined:
    Aug 11, 2002
    Messages:
    14,495
    Likes Received:
    791
    Trophy Points:
    164
    This is my guess as well.
  4. 2000xp8

    2000xp8 Mustang Master

    Joined:
    Aug 9, 2003
    Messages:
    5,378
    Likes Received:
    218
    Trophy Points:
    104
    If it were lack of fuel you wouldn't hear the pump prime or wouldn't have any pressure at the shrader valve.

    I'm with these guys, probably the tfi.
    If it is, do not replace it with anything other than a ford unit, unless you want to do this again in 6 months.
  5. mikestang63

    mikestang63 Mustang Master

    Joined:
    Aug 28, 2012
    Messages:
    3,409
    Likes Received:
    885
    Trophy Points:
    144
    K rect o mundo. Do not get an aftermarket one. In fact , when I am at the JY I try and grab a spare one if I see one as cheap insurance.

    Rock Auto has the best price on the Ford unit. They make them for T5 and AOD's.
  6. larrym1961

    larrym1961 Member

    Joined:
    Dec 18, 2010
    Messages:
    484
    Likes Received:
    24
    Trophy Points:
    19
    I always carry a spare TFI and a Motorcraft one at that.
  7. LarsD

    LarsD Founding Member

    Joined:
    Jul 2, 2002
    Messages:
    2,562
    Likes Received:
    55
    Trophy Points:
    68
  8. 2000xp8

    2000xp8 Mustang Master

    Joined:
    Aug 9, 2003
    Messages:
    5,378
    Likes Received:
    218
    Trophy Points:
    104
  9. smkshw

    smkshw Active Member

    Joined:
    Feb 12, 2010
    Messages:
    434
    Likes Received:
    56
    Trophy Points:
    39
    i had 2 bad msd tfi's,put a 10 year old stock one on good to go....
    larrym1961 likes this.
  10. LarsD

    LarsD Founding Member

    Joined:
    Jul 2, 2002
    Messages:
    2,562
    Likes Received:
    55
    Trophy Points:
    68
    Weak. The worst part is I think you guys are right... I suspected fuel delivery, or a timing issue. Based on the simple fact that after the car sat for 15-20 minutes it fired back up. Actually, as it sat I kept trying to start it, and it slowly tried to fire more consistently. Why is it no one can make a TFI that is worth the plastic it is made from except for Ford? What are we going to do when that supply dries up?
  11. Gearbanger 101

    Gearbanger 101 we love us some gays up here Super Mod

    Joined:
    Aug 11, 2002
    Messages:
    14,495
    Likes Received:
    791
    Trophy Points:
    164
    So....how new is it? As in still under warranty new? I'd at the very least get them to replace it.
  12. LarsD

    LarsD Founding Member

    Joined:
    Jul 2, 2002
    Messages:
    2,562
    Likes Received:
    55
    Trophy Points:
    68
    Just ran out like a couple weeks ago. :mad:
  13. jetmech807

    jetmech807 Mustang Master

    Joined:
    Dec 2, 2011
    Messages:
    1,475
    Likes Received:
    441
    Trophy Points:
    104
    Doesn't that make the answer to your problems obvious then?
  14. larrym1961

    larrym1961 Member

    Joined:
    Dec 18, 2010
    Messages:
    484
    Likes Received:
    24
    Trophy Points:
    19
    The TFI on my May Suddenly Die Pro Billet distributor went T/U less than a month after installation. Even though MSD replaced it with another one of their POS TFI's, I stuck a Motorcraft one on there and have been problem free since.
  15. LarsD

    LarsD Founding Member

    Joined:
    Jul 2, 2002
    Messages:
    2,562
    Likes Received:
    55
    Trophy Points:
    68
    I am hesitant to throw money at parts when i don't know for sure what the problem is. I'd hate to go through what I did before where I thought the car was fixed only to have it break down again on me.
  16. 2000xp8

    2000xp8 Mustang Master

    Joined:
    Aug 9, 2003
    Messages:
    5,378
    Likes Received:
    218
    Trophy Points:
    104
    Look at it this way, you are replacing that dyna module sooner or later. So even if it's not that, it's good preventive maintenance.


    You are looking for a part that cools off, then works again. The pip and tfi are the usual culprits.

    There is actually a kit to relocate the TFI similar to what ford did with the 94/95. I usually see it on ebay.
    Last edited: Mar 25, 2014
  17. LarsD

    LarsD Founding Member

    Joined:
    Jul 2, 2002
    Messages:
    2,562
    Likes Received:
    55
    Trophy Points:
    68
    Well I ordered a TFI relocation kit (was planning to do this anyway), and next month I'll order a new Ford TFI. Hopefully that fixes it. I let the car warm up today and I kept checking the timing on it to see if it was holding steady or not, and it was kinda jumping around a bit at idle, but that doesn't seem to unusual to me.

Share This Page