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Thread: 1991 Fox Body Spark Woes

  1. #11
    Join Date
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    In that case, it seems like a wiring problem.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, R134a A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  2. #12

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    Yeah, that's where I was in my first post. I'm trying to find out where, but I can't find what wiring it could be. Everything I check is good, has continuity, or have power & ground where it should. It's crazy. Not sure on next steps. I ordered a genuine Motorcraft TFI module. I'll see if it changes anything. Thanks again.

  3. #13

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    The TFI harness may have been damaged with the short. Test the harness for an open or short to ground. The PIP signal at the ECU while cranking should have a average reading on a multimeter such as 4.5 - 5V or square wave on a scope. The reason for spark with the ECU unplugged, is the TFI module is firing the coil in base timing mode.

  4. #14

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    I don't have a scope, I can check at the ECU for the voltage on the PIP signal wire. Just need to find which one it was.

  5. #15
    Join Date
    Dec 2009
    Location
    Connecticut
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    Google it, Ford TFI information is easily found.
    http://assets.fluke.com/appnotes/aut...e/beatbook.pdf (Fluke Multimeter Testing - "Hall-Effect Sensors", Page 17)
    https://www.yumpu.com/en/document/read/ (Understanding/Troubleshooting Hall-Effect Sensors - "Troubleshooting", Page 2)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, R134a A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  6. #16

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    Google what? I know the pin on the TFI. I was talking about the other end of the Holley harness that plugs into the ECU.

  7. #17

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    The PIP signal would be tested at the purple wire, Pin A30 at the ECU.

  8. #18
    Join Date
    Dec 2009
    Location
    Connecticut
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    Yes, the Crank Input wire, cavity A in the 10-pin Ignition Connector (EFI Main Harness). It's the PIP yellow/black wire on the Ford TFI ignition adapter, which connects to the purple wire in the EFI Main Harness. It's in the instructions: https://www.holley.com/products/fuel.../parts/558-305 (Holley 558-305 Ford TFI Ignition Adapter Harness - 30" Long)

  9. #19

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    The PIP signal can also be tested with an LED test light and should blink while cranking. The signal should be tested at the TFI module and ECU in case of a wiring fault.

  10. #20

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    Both at the ECU and at the TFI, I get solid power when key on, and blinking LED test light when cranking. Still no spark. The white signal wire gets steady power the full time, even while cranking. That's the Ford Motorcraft TFI and the new DUI TFI module. I get steady power at the coil as well. Not intermittent. What does this mean?

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