Question about 1995 Ford Thunderbird

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1995 Ford Thunderbird, 4.6L. Fuel is pouring into the engine. All spark plugs show black soot. Checked Fuel Pressure and the regulator seems to be working. Exhaust smells like raw gasoline and raw fuel is emitted from the tail pipes when engine is accelerated. OBD monitor indicates coolant temp sensor is working. Any ideas?

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Hi, the primary sensor inputs used by the computer to establish the appropriate injector pulse width are the MAF snesor and the TPS. I recommend you test these sensors according to procedure pasted below and repair as indicated by test results. Please let me know if you have any questions, and thanks for using FixYa.

MAF Sensor Tests, 1995-96 4.6L Engines

1995 Ford Thunderbird, 4.6L.  Fuel is pouring into - jturcotte_1469.gif

Fig. Fig. 3: The mass air flow (MAF) sensor connector-1995-96 4.6L and 1996 3.8L engines

  1. With engine running, use DVOM to verify there is at least 10.5 volts between terminals A and B of the MAF sensor connector. This indicates the power input to the sensor is okay.
  2. With engine running, use DVOM to measure voltage between MAF sensor connector terminals C and D. If the reading is about 0.34-1.96 volts at idle, the sensor is okay.

TPS TESTING (Note, this procedure calls for a breakout box, but the same test can be accomplished by probing the back of the TPS connector at the brown/white and grey/white wires)

  1. Disconnect the negative battery cable.
  2. Remove the PCM and connect a breakout box to the PCM and harness.
  3. Probe terminals 89 and 90 with an ohmmeter.
  4. Slowly rotate the throttle shaft and monitor the ohmmeter for a continuous change in resistance. Any sudden changes in resistance indicates an open or substrate sensor.
  5. Reconnect the negative battery cable.
  6. Turn the ignition switch ON and using a voltmeter, measure the voltage between terminals 89 and 90 of the breakout box. The specification is 0.8 volts on the 2.3L, 3.8L and 5.0L engines or 0.9 volts on the 4.6L engine.
  7. If the voltage is outside the standard value or if it does not change smoothly, inspect the circuit wiring and/or replace the throttle position sensor.


Posted on Apr 04, 2011

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I would start with the throttle body, It sounds like it is cracked and allowing the fuel to get into your engine, Sorry if this is not correct but this is where i would start, Good luck to you.

Posted on Apr 04, 2011


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