Question about 1989 Mercury Grand Marquis

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1989 Mercury Grand Marquis ignition problem, replaced ECM, ignition module, coil and ignition switch, power is available at the coil, however, no fire from the coil to the distributor. What could be the problem.

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Absolutely. In older cars, the coil would still get its spark from the battery, but it would then route it to a distributor which relied on a rotor to rotate the spark to each cylinder connection. Firing off of ignition points, the electricity is then routed to the spark plugs. In later designs, the coil operated in the same fashion but sent the spark to an HEI distributor that didn't use points. In today's vehicles, the application of the coil is vastly different. Coils now sit right on top of the spark plugs or spark plug wires and route current transferred from the battery directly to where it is needed. Most of the time, its one ignition coil for each cylinder, but some car makers will run two valves off of one ignition coil. The new system removes the need for a distributor, rotor, distributor cap, and ignition points. It allows the car's ECU to control the firing order.

The typical cause of problems for ignition coils would be corrosion from air flow or exposure to any chemicals, lubricants, solvents, or cleaners in common use around the motor. The connecting points will get corroded causing a lower grade spark and possibly intermittent spark. Coils will occasionally fail altogether internally becoming useless, but this is rare. In older cars with distributors and ignition points, coils sometimes overheat from current strength and would melt the wires connected to it.

If you have a complete coil failure, it would be easy to tell as your car won't start. If you have the more common corrosion problem, then it all comes down to a weaker and intermittent spark as the transmission of your electrical current will be disrupted.

Re-check or replace the ignition control module could be finally.

Hope helps.

Posted on Jul 19, 2010

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