Mechanics

MERCURY MARQUIS SENSOR PROBLEM

1998 Mercury Marquis • 155,000 miles

Where is the ignition module located on a 1998 Grand Marquise 4.6 L GS?
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Artflo
November 15, 2012.




It doesn't have one. The PCM does that job.

Wrenchtech
Nov 15, 2012.
I have replaced PCM and the Crankshaft position sensor and all 8 coil on plugs and it still runs very ruff.

What else is there in the ignition system of a 98 Mercury Grand Marquise 4.6L GS?

PCM replaced, Position sensor replaced, COP replaced.

Arthur

Tiny
Artflo
Nov 15, 2012.
It don't have one, it uses cam and crank sensors to tell the PCM that the engine is turning over and then that starts the firing order sequence by firing the injectors at the proper time. You didn't mention anything about replacing spark plugs and if so what brand and type did you use? It may be a bad injector.
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Racefan966
Nov 15, 2012.

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