HELP!wait to start light works only sometimes/ glow plugs may not be working properly

Discussion in '6.9L IH & 7.3L IDI Diesels' started by IDIotbobby, Oct 5, 2011.

  1. IDIotbobby

    IDIotbobby Registered User

    Posts:
    16
    Likes Received:
    0
    Joined:
    Oct 5, 2011
    Location:
    Lawrenceburg, Indiana
    i just bought a 1992 7.3 when i put the ignition in the on position my wait to start wont come on. i doubt it is a fuse cause sometimes it will come on, any ideas. also in the mornings when i go to sart it i get no light so i wait for about a minute to start, turn the key, it cranks but wont start. i put it back in the run position try again and it starts. the temperture hasnt been getting lower than 45 at night. this is my first diesel so im new to it all. just trying to figure it all out. any ideas?
     
  2. CaptTom

    CaptTom Full Access Member

    Posts:
    725
    Likes Received:
    0
    Joined:
    May 22, 2009
    Location:
    ca
    How sad is this... just happened to me this morning too. :dunno

    I replaced the GP relay and Beru's a month or so ago and all was good until this AM.

    Did I burn it out already?

    I have exactly the same symptoms as you described.
     
  3. IDIotbobby

    IDIotbobby Registered User

    Posts:
    16
    Likes Received:
    0
    Joined:
    Oct 5, 2011
    Location:
    Lawrenceburg, Indiana
    well this morning my wait to start light worked once the light went off she started right up. but when i left school a turned the key, guess what. no light. i really dont have a clue what is going on.
     
  4. gonecrazyi

    gonecrazyi Full Access Member

    Age:
    26
    Posts:
    3,259
    Likes Received:
    0
    Joined:
    Aug 27, 2008
    Location:
    florida
    I removed and reinstalled my turbo yesterday and my light quite as well.the relay doesn't sound like its working properly but it is working and the truck does start. Its just one more thing I have to look into.
     
  5. IDIotbobby

    IDIotbobby Registered User

    Posts:
    16
    Likes Received:
    0
    Joined:
    Oct 5, 2011
    Location:
    Lawrenceburg, Indiana
    yah im not too worried about it but i definatly want it fixed before the cold weather sets in
     
  6. f-two-fiddy

    f-two-fiddy Registered User

    Age:
    53
    Posts:
    2,954
    Likes Received:
    0
    Joined:
    Mar 22, 2004
    Location:
    Duluth, Mn.
    Check the GP's. If any are dead, You'll get shorter glow times.
     
  7. subway

    subway be nice to the admin :D

    Posts:
    5,656
    Likes Received:
    2
    Joined:
    Oct 4, 2006
    Location:
    York PA
    i havent looked into it but my WTS light does not always come one, it i will work for a bit then not. what i do is watch the volt gage to see whats going on. everything is working except the light. i know that when the voltage pops up the glow plugs are done and it starts normally.
     
  8. CaptTom

    CaptTom Full Access Member

    Posts:
    725
    Likes Received:
    0
    Joined:
    May 22, 2009
    Location:
    ca
    Here's the latest on mine and theory.

    Yesterday afternoon, my light didn't come on again either, got it started with puff of white smoke- raw unburned diesel...atomized diesel.

    This morning, I turned the key to on, light didn't come on so I turned it off. The second time, I accidentally went a hair beyond on, but not all the way to start. The light popped on.

    I think the GP relay's solenoid is sticking or there's carbon build up inside the solenoid. I noticed lately, the GP is clicking. It can be heard and seen on the volt meter bouncing as it clicks. One or more of the Beru's may be going, new ones too.

    It's either that, or my ignition switch is going bad.

    I don't know if I'm just cookoo or if I'm on the path to repair.
     
  9. OLDBULL8

    OLDBULL8 Good Morning Ya'll.

    Age:
    88
    Posts:
    9,448
    Likes Received:
    0
    Joined:
    Feb 12, 2009
    Location:
    Delphos , Ohio
    The RED/Lt.Grn wire powers the GPR from the key switch. Check the hot wire to the key switch. Try to start, if starter energizes then, power to switch is OK. Check power (Red/Lt.Grn) to GPR at the GPR with key switch to ON. Check ground (Black) at the GPR.

    Next post for Capt.Tom. go there.
     
    Last edited: Oct 7, 2011
  10. OLDBULL8

    OLDBULL8 Good Morning Ya'll.

    Age:
    88
    Posts:
    9,448
    Likes Received:
    0
    Joined:
    Feb 12, 2009
    Location:
    Delphos , Ohio
    This post for Capt. Tom.

    http://search.ebscohost.com/

    User -- Bedford Pass--library
    Click the following, Auto Rep. Ref, 2003, Ford, Select -V8 7.3 Diesel,Wiring diag., engine controls. Then select one of the four wiring diagrams.

    Hope this helps. Let me know if it works for you.

    Anyone else, there is a wealth of info there, not all Ford wiring diagrams are there.
     
    Last edited: Oct 7, 2011
  11. CaptTom

    CaptTom Full Access Member

    Posts:
    725
    Likes Received:
    0
    Joined:
    May 22, 2009
    Location:
    ca
    OB8..... THAT!.....IS!.....INCREDIBLY!......GREAT!.....INFO! :thumbsup: :hail
     

Share This Page