Question about 1985 Mercury Grand Marquis

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1985 302 cranks but no spark from coil. The coil is new. The two wires going into the coil have power. Wondering how to troubleshoot.

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  • 2 more comments 
  • moe_bot Oct 14, 2010

    How can i tell?

  • moe_bot Oct 14, 2010

    I don't know. How can I Tell?

  • moe_bot Oct 16, 2010

    It has the TFI. I purchased one and installed. Now the distributor cap is broke. waiting on the to come in. should be in tomorrow.

  • moe_bot Oct 20, 2010

    I replaced the rotor earlier and when replacing the ignition module I found the wires going into the pickup were deteriorated. Replaced both about $120 total. Runs like a top. 102,000 mi. Thankyou for the help. Quick response very helpful.



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Is the ignition system a duraspark or TFi (thick film integrated)?

Posted on Oct 14, 2010

  • 2 more comments 
  • GetMeOttaHere Oct 14, 2010

    Duraspark should be a black box mounted on either the wheel well or firewall and will look like this;

    The TFi system will have a module mounted on the distributor and will look like this;

    Replace the unit you have and this should resolve your spark issue. It is very common for these to just quit working, causing your condition.

  • GetMeOttaHere Oct 14, 2010

    The second image is the distributor as an assembly with the TFi module shown and labeled. It is attached to the distributor by screws.

  • GetMeOttaHere Oct 16, 2010

    Don't forget to replace the rotor also. You may as well replace the spark plug wires to, if this has not been done in a while.

  • GetMeOttaHere Oct 20, 2010

    Excellent job. Glad to hear this repair went well.



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