Question about 1994 Mercury Cougar

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Car blows raw fuel from tail pipe

Car starts and runs fine but blows grey smoke and raw fuel from tail pipe i have replaced mass air flow sensor tps sensor air temp sensor and fuel pressure regulator

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Hello,

If you can get the car to Orielly's or Autozone they will check the OBD1 system for free to help you fix the problem.

This sounds like the fuel is not burning in the combustion chamber due to a lack of spark, excess fuel and smoke. On vehicles with a coil pack for every cylinder you would replace the coil pack but on your vehicle you have two coil packs, one for each side. If a coil pack is bad this would cause your problem (left or right). The auto parts people should be able to help you further, but I think this is the problem. (I had a similar problem).

Good luck!!!

Posted on Jan 22, 2013

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Posted on Jan 02, 2017

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skychief2001
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SOURCE: 95 mercury i replaced tps and mass flow air and car running for 10 min now wont start at all

I would check for trouble codes in the computer and fuel pressure next.
You need to figure out if you are dealing with a no spark or low fuel pressure issue to proceed.

Posted on Aug 14, 2012

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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

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.

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