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  1. #1

    Default 1984 SVO no start, tried the usual suspects

    My 84 SVO died the other day while driving. Shortly after getting it washed. I did notice a decent amount of water dripping from the hood insulation on to the motor.

    it turns over and tries to start. As if its not getting fuel. Will sputter and stall out. Noticed tach jump a bit on occasion while trying to start.

    Cant get codes in koeo. Just shows 000. Tried to ground the single plug. Still nothing. Need to try the paper clip.

    (new 255lph single pump)
    fuel pump primes, fuel up to rail. (Havent had a chance to check pressure at shrader)
    noid light on injectors flash when cranking

    In line spark tester shows spark.

    TPS seems to spec out

    will not try to start at all with vam disconnected.

    grounds all look ok.

    Cam timing seems to be good too.

    havent checked ign timing.

    im stumped. Fuel, spark, air...it should start.

    any ideals?

  2. #2
    Moderator wraithracing's Avatar
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    In most cases like this I would consider the TFI module as my first place to start. Had a similar issue with my 86 Bronco. Would die on my daughter at low speeds when warm and was a hard start after that happened. Everything appeared to be fine. Ultimately replaced the TFI module and it hasn't died since then.

    Other issues could be internal to the distributor and possible weak coil. Sounds like an ignition issue to me and not fuel related. Obviously verifying fuel pressure and flow would be a good idea just to cross it off the list of possible reasons. Good luck!
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Stalled RestoModification
    1984 SVO Still Waiting Restoration
    1986 GT Under going Wide Body Conversion Currently

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Stalled in TX
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

  3. #3

    Default

    Thank you for the reply.
    i hate to throw money at problems but i agree with you on the TFI. Was planning on throwing a new one just for replacement sake prior to this issue.

    i intend to check fuel pressure tomorrow and install a new TFI tomorrow. I'll report back.

  4. #4
    Moderator wraithracing's Avatar
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    Quote Originally Posted by VEGASbabyVEGAS View Post
    Thank you for the reply.
    i hate to throw money at problems but i agree with you on the TFI. Was planning on throwing a new one just for replacement sake prior to this issue.

    i intend to check fuel pressure tomorrow and install a new TFI tomorrow. I'll report back.
    I completely understand and feel the same way. I put off the TFI swap on the Bronco for longer than I should have and finally decided it was the best option and due to the age alone was preventive maintenance. I do HIGHLY recommend only using a Ford or Motorcraft TFI module. I have not had good luck with any of the aftermarket versions. I believe AZ price is pretty decent on the Motorcraft TFI or at least it was for my Bronco. Good Luck!
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Stalled RestoModification
    1984 SVO Still Waiting Restoration
    1986 GT Under going Wide Body Conversion Currently

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Stalled in TX
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

  5. #5

    Default

    Had some time to mess with it tonight.

    found some of the factory wiring in bad shap.

    green wire off the coil and green wire to the balast resistor.

    yellow wire coming off the tfi.

    patched those up.

    now it will run. Barely. with wot. It'll run very rough but as long as i keep it floored. It doesnt die.

    ran out of light. To investigate further

  6. #6

    Default

    I'm actually a store manager at autozone and agree 100% with you on the motorcraft version. I have it sitting on my bench. It would be in the car if it wasnt my 19 anniversary today.

  7. #7
    FEP Power Member
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    Have you checked the timing belt?
    Fox Body/3rd Gen MCA Gold Card Judge
    84 SVO 24K miles, 85 Mclaren Capri Vert. 84 GT Turbo Vert.
    88 Mclaren Mustang Vert 20K miles, 89 Mustang LX Sport Vert,
    03 Mach 1 7900 miles, 74 Mustang II, 69 Mustang, 67 Mustang, 07 GT500,
    14 Mustang CS/GT, 15 F150 FTX Tuscany, 16 F250 Crewcab, 67 Tbird 47K miles

  8. #8

    Default

    Seems to be good. But it is on my list to check 100%

    the fact that the throttle has no effect on rpm makes me think that belt and timing isn't the issue. But maybe i'm wrong?

    when it does "start" it idles great for about 1 mississippi. Then it starts to sputter and die. If i go wot at this point. Thats when it i can keep it running. Badly... about the same time the fuel pump stops priming.

    it would NOT do this 2 days ago.

    tach is moving. And my understanding is that it does not continue to run until it see's a signal from the tach? I guess i'll have to verify that too.

  9. #9
    FEP Power Member Broncojunkie's Avatar
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    Quote Originally Posted by VEGASbabyVEGAS View Post
    I'm actually a store manager at autozone and agree 100% with you on the motorcraft version. I have it sitting on my bench. It would be in the car if it wasnt my 19 anniversary today.
    You guys used to be able to bench test tfi modules. Is that still possible?
    79 Pace Car - 331, t5
    79 Pace Car- 302, 4 spd
    79 Cobra - working on 351w, t5
    82 Capri- working on 302, t5
    82gt - working on 408w, c4

  10. #10

    Default

    Yes. Used to. Not all locations still have a working tester.

    as soon as i have more than a few minutes at a time. I am going to pull and replace it anyway. Would have last nigh. But could not locate my heat sink compound.

  11. #11
    FEP Senior Member
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    Yep, if the tach needle bounces, it's getting the signal from the fuel pump relay. Check fuel pressure too.
    Bleed Ford Blue! '84 Grabber Orange SVO, '88 Saleen 1 of 4 w/Automatic, '89 Steeda, '71 DeTomaso Pantera GT5 Wide Body EFI 4.6 DOHC...soon to be a Gen3 Coyote and some Old Ford Muscle w/ BB power. 1.21 Jigawatts!!?? PETRO EXPRESS=CITGO=BOYCOTT!
    State of Illinois - Taxation without Representation!

  12. #12

    Default

    On my list. Its def getting good pressure when it primes but may be falling off when it stops.

  13. #13

    Default

    Had more time to mess with it today.

    fuel pressure tester doesnt work. Have to go grab another. But there was plenty of fuel at the line when the pump primed. Pump primes, relay clicks, and there is power at the inertia switch.

    still cant retrieve codes from test port. Code reader/test light. Neither work. Wiring looks ok too.
    could not jumper the test port to activate fuel pump either

    im heading out to place tfi now. Will report back

  14. #14

    Default

    Replaced TFI. No improvement.

  15. #15

    Default

    Ok im at a loss.

    i think whatever tells the fuel pump to stay on with tach signal is the issue.
    pip? I have spark, tach needle moves? My understanding is that these indicate its good.
    tfi? Replaced

    I have to go wot and will barely idle
    throttle has no effect on engine rpm.

  16. #16

    Default

    Finally had a decent amount of time today.

    i have fuel pressure for sure when it primes. But only about 20 psi. And it bleeds off quick. (Heard that bleeding is normal will 255 walbro?)

    Finally was able to pull some koeo codes 18 for spout and 53 for tps out range

    Got fuel pump to jumper form obd port.

    new tps. Adj triple checked. New tfi.

    please anyone?

  17. #17
    Moderator wraithracing's Avatar
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    I haven't personally heard of bleed off with a Walbro 255 being an issue, but who knows.

    If only 20 psi that sounds to me like either a FPR issue or possibly a bad pump. Generally you need to be around 39-41 PSI on the rail. I believe "normal" nominal fuel pressure for most Ford EFI system is 39.15 psi.

    I might be wrong, but with that pressure and the bleed off, the first thing I think of is a bad pump. I assume you have verified that your fuel filters are good and not clogged up too.
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Stalled RestoModification
    1984 SVO Still Waiting Restoration
    1986 GT Under going Wide Body Conversion Currently

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Stalled in TX
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

  18. #18

    Default

    Both fuel filters have about 200 miles on them. And tank was very clean. But yes i will need to verify them.

    With the low psi im starting to suspect something with the pump too. Damn. Full tank of gas i gotta siphon out.

    guess that will be next on the list.

  19. #19
    Moderator wraithracing's Avatar
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    Disconnect the fuel line and jumper the pump to use the pump to siphon out most of the fuel. Saves time and doesn't give you that terrible fuel taste in your mouth. Good Luck!
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Stalled RestoModification
    1984 SVO Still Waiting Restoration
    1986 GT Under going Wide Body Conversion Currently

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Stalled in TX
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

  20. #20

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    Roger that. Thanks for your help. Ill report results

  21. #21
    FEP Power Member
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    I believe you have 2 fuel pumps. One in the tank and one under the car. The one under the car died on me. Much easier to change as well.
    Fox Body/3rd Gen MCA Gold Card Judge
    84 SVO 24K miles, 85 Mclaren Capri Vert. 84 GT Turbo Vert.
    88 Mclaren Mustang Vert 20K miles, 89 Mustang LX Sport Vert,
    03 Mach 1 7900 miles, 74 Mustang II, 69 Mustang, 67 Mustang, 07 GT500,
    14 Mustang CS/GT, 15 F150 FTX Tuscany, 16 F250 Crewcab, 67 Tbird 47K miles

  22. #22
    FEP Senior Member
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    Trey, right on target. 40 PSI is needed. Start at the pump. Did you replace the HP pump with a fuel filter, that's why there are 2?
    Bleed Ford Blue! '84 Grabber Orange SVO, '88 Saleen 1 of 4 w/Automatic, '89 Steeda, '71 DeTomaso Pantera GT5 Wide Body EFI 4.6 DOHC...soon to be a Gen3 Coyote and some Old Ford Muscle w/ BB power. 1.21 Jigawatts!!?? PETRO EXPRESS=CITGO=BOYCOTT!
    State of Illinois - Taxation without Representation!

  23. #23

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    Had 2 pumps. Explain that in post #1 been coverted to a single walbro.
    1984 Mustang SVO
    1989 Saleen Mustang 0448
    1990 Ford Bronco
    1988 Honda CRX
    2014 Ford Edge Sport

  24. #24

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    Yes replaced frame mounted high pressure with fuel filter.
    1984 Mustang SVO
    1989 Saleen Mustang 0448
    1990 Ford Bronco
    1988 Honda CRX
    2014 Ford Edge Sport

  25. #25
    Moderator wraithracing's Avatar
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    Quote Originally Posted by VEGASbabyVEGAS View Post
    Yes replaced frame mounted high pressure with fuel filter.
    I don't recall the whole issue right now, but I know another member that did the single pump swap and had issues with getting full power to the single pump in the tank. I wish I remembered what exactly was the issue, but they weren't getting a full 12V to the pump in the tank after making the swap and it was causing fueling issues since the pump was not at full power. Might not be an issue for you, but might be worth double checking that you have full voltage to the pump when running. Just a thought. Good Luck!
    ​Trey

    "I Don't build it hoping for your approval! I built it because it meets mine!"

    "I've spent most of my money on Mustangs, racing, and women... the rest I just wasted."

    Mustangs Past: Too many to remember!
    Current Mustangs:
    1969 Mach 1
    1979 Pace Car now 5.0/5 speed
    1982 GT Stalled RestoModification
    1984 SVO Still Waiting Restoration
    1986 GT Under going Wide Body Conversion Currently

    Current Capris:
    1981 Capri Roller
    1981 Capri Black Magic Roller Basket Case
    1982 Capri RS 5.0/4spd T-top Full Restoration Stalled in TX
    1984 Capri RS T-top Roller
    1983-84 Gloy Racing Trans Am/IMSA Body Parts

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