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1999 Mercury Grand Marquis GS 4dr Sedan

1999 Mercury Grand Marquis
Trim Info:
Rear Wheel Drive, 4 Door Sedan, Large
17 mpg city / 24 mpg hwy
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February 25, 2013, 8:54 am

Darka W
 

Question: Why can I drive my car a quarter mile before it starts miss firing?

I have done a injector cleaning service but it is still missing.


February 25, 2013, 7:47 pm

Tyler O
Expert Mechanic

Some sensor or component is going out as it heats up. This could be just about any ignition system component, probably a coil?

Try and see whats going on when it misfires. Are you loosing spark or fuel, and to what cylinders?

Use a scan tool to check fault codes from the engine computer as a first step.


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