Question about 1999 Mercury Grand Marquis
When you fix something that lights the "Check Engine" light you need to clear the computer. You do this by undoing the NEG battery cable for 10 minutes and then reconnecting it. Otherwise the old warning will show for 25-40 startups before the old warning cycles out.
If you did clear the computer and still get the warning you need to check the other things that the coils hook up to. These would be the plug wires and the sparkplugs. Another possibility is you were off on the layout of #1 cylinder and firing pattern, then changed out the wrong coil.
Posted on Aug 04, 2010
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Posted on Jan 02, 2017
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