Results 1 to 10 of 10

Thread: 1984 5.0 thunderbird cfi won't start? HELP

  1. #1
    Join Date
    Nov 2015
    Location
    west palm
    Posts
    31
    Feedback Score
    0

    Default 1984 5.0 thunderbird cfi won't start? HELP

    Hey guys at it aging, when I parked this car it ran.. I cleaned up some shotie wiring, replace and cleaned the grounds..Replaced the positive wire to the solenoid. . I have spark,but won't start.. Sprayed starter fluid and it fired on that???Then I followed up by watching the injectors spraying some gas in...I'm kinda thinking the injectors aren't spraying as good as they we're before? I put 91 octane with Lucas fuel treatment,or injector cleaner. .Don't remember exactly what one it was.. But it won't fire on the gas it's getting?
    .

  2. #2
    Join Date
    Oct 2004
    Location
    East Coast Virginia
    Posts
    10,228
    Feedback Score
    0

    Default

    Quote Originally Posted by dennis89 View Post
    Hey guys at it aging, when I parked this car it ran.. I cleaned up some shotie wiring, replace and cleaned the grounds..Replaced the positive wire to the solenoid. . I have spark,but won't start.. Sprayed starter fluid and it fired on that???Then I followed up by watching the injectors spraying some gas in...I'm kinda thinking the injectors aren't spraying as good as they we're before? I put 91 octane with Lucas fuel treatment,or injector cleaner. .Don't remember exactly what one it was.. But it won't fire on the gas it's getting?
    .
    If it starts on fluid you have bad fuel or a fuel delivery issue... I'll say if you can see fuel from injectors it should try to start, that is unless it's over fueling... BUT if it were over fueling, likely it wouldn't try to start on starting fluid...






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  3. #3
    Join Date
    Apr 2009
    Location
    Ohio
    Posts
    1,316
    Feedback Score
    0

    Default

    How old is that gas? How long has it been sitting?

    I know on my 85 turbo, there is a rubber tube between the in-tank fuel pump and the top plate on the sending unit. This tube dries out and cracks. This will cause you to have inadequate fuel delivery. You'll get some, but not enough. I am not sure if the CFI motors had this same issue, but its something to look into.
    CoogarXR

    1986 LTD Wagon
    1985 Cougar XR-7


  4. #4
    Join Date
    Nov 2015
    Location
    west palm
    Posts
    31
    Feedback Score
    0

    Default

    The car sat for awhile before I got it..I put a battery in it and it started up..Drove it home so I know it ran good, And I just put the fuel in it fresh 5 gal 91 octane with fuel treatment.. And it won't fire over? How do I go about testing to see if I have the right amount of pressure in the line? I know there's a low pressure line and a high pressure line.. But don't know how about goin about testing the pressure in the line or what one to test? I went a rented a master fuel injection test kit from congress auto. . But need some help with how to go about doin it? AND buy the way I definitely hear the fuel pump turning on when I turn the key..??

  5. #5
    Join Date
    Oct 2004
    Location
    Utah.
    Posts
    9,234
    Feedback Score
    2 (100%)

    Default

    There should be a regulator to limit pressure. Technically you should be testing it after the regulator.

    My 86 sefi motor has no test port on the fuel rail like most 86-88 sefi cars do, so I get a small peice of rubber hose and pull my fuel filter off and test it on the output side of the fuel filter.

    This will tell you if your pump is working and if your getting enough fuel through the filter. It will not tell you your regulated fuel pressure, however.

    Turbo coupe is on the right track. Try starting fluid. If it starts on the starting fluid you have a fuel problem, if it doesn't its electrical/sensor related.
    Quote Originally Posted by jcassity
    I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
    Hooligans!
    1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
    1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
    1986 cougar.
    lilsammywasapunkrocker@yahoo.com

  6. #6
    Join Date
    Nov 2015
    Location
    west palm
    Posts
    31
    Feedback Score
    0

    Default

    I tried starting fluid and it fires..

  7. #7
    Join Date
    Nov 2015
    Location
    west palm
    Posts
    31
    Feedback Score
    0

    Default

    I thought I was you tested it und er the hood on a low pressure hose??

  8. #8
    Join Date
    Nov 2015
    Location
    west palm
    Posts
    31
    Feedback Score
    0

    Default

    Never had to do this be for so I'm a little lost? And is there any easy way to drain the tank?

  9. #9
    Join Date
    Oct 2004
    Location
    Utah.
    Posts
    9,234
    Feedback Score
    2 (100%)

    Default

    Yup, jump the fuel pump wire in the test connector and the fuel pump will run as long as the key is on. I'd just unhook the fuel filter, but you seem to be adverse to that for some reason.

    If you have a fuel Schrader valve somewhere under the hood, use it. It looks like a air tube fill up thing for your tires. My car does not have a test port, which is why I tested mine off of the fuel filter. If I had an under hood fuel pressure tester port, I would much rather use that then crawl under neath the car, get my self covered in gas when I pull the filter hose off and then let it spill all over me while I try to hook a rubber hose over the end of the filter, but that's just me.
    Quote Originally Posted by jcassity
    I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
    Hooligans!
    1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
    1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
    1986 cougar.
    lilsammywasapunkrocker@yahoo.com

  10. #10
    Join Date
    Nov 2015
    Location
    west palm
    Posts
    31
    Feedback Score
    0

    Default

    Thank you guys I just had a vapor lock I guess! pulled off the lines ran the fuel pump a bit, did the same with the lines up front.. Hooked it back up...And she's purring like a kitten.. Thanks guys once again appreciate all the help!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •